fix (ui): Change qty to double in Manual Fills Import dialog

fix (ui): Show decimal places in Manual Fills Qty column
refactor: Expose price/qty display settings as Security ext fns
2025-08-18 12:11:22 -05:00 · 2025-08-18 12:11:22 -05:00 · 2025-08-18 12:11:13 -05:00 · 2025-08-18 15:54:22 +00:00 · 2025-08-18 15:54:22 +00:00 · 2025-08-18 15:51:11 +00:00
2528 changed files with 52683 additions and 18020 deletions
@@ -65,7 +65,7 @@ RUN \
   && apt-get install -y cmake

 # Dotnet
-RUN apt-get update && apt-get install -y dotnet7
+RUN apt-get update && apt-get install -y dotnet8

 # Node
 ARG node_major=18
@@ -90,6 +90,12 @@ RUN apt-get update && apt-get install -y libpcap0.8-dev
 # Databento (deps)
 RUN apt-get update && apt-get -y install libzstd-dev

+# Docker in Docker
+RUN apt-get update && apt-get install -y \
+    docker.io \
+    docker-compose \
+    docker-compose-v2
+
 # Set up default executables (update-alternatives)
 RUN \
   update-alternatives --install /usr/bin/clang clang /usr/bin/clang-$clang_major 100; \
@@ -12,23 +12,17 @@
  // example, if 8000-8003 is taken, go with 9000-9003, then 10000-10003, etc.
  "runArgs": [
    "--shm-size",
-    "8gb",
-    "-p",
-    "8000:8000",
-    "-p",
-    "8001:8001",
-    "-p",
-    "8002:8002",
-    "-p",
-    "8003:8003",
-    "-p",
-    "12345:12345"
+    "8gb"
+  ],
+  "mounts": [
+    "source=/var/run/docker.sock,target=/var/run/docker.sock,type=bind"
  ],
  "customizations": {
    "vscode": {
      "extensions": [
        "eamodio.gitlens",
        "llvm-vs-code-extensions.vscode-clangd",
+        "ms-python.python",
        "ms-vscode.cmake-tools",
        "ms-vscode.cpptools",
        "xaver.clang-format"
@@ -0,0 +1,49 @@
+# This file defines the global default configuration for docker deployments.
+# It is tracked in source control. For temporary modifications, please create
+# a separate file called ".env.local" (it's in .gitignore, so won't be tracked).
+# If a variable is defined in both files, the value in .env.local will be used.
+#
+# About the deployment procedure:
+#   We use Docker Compose to build images and launch containers for various services
+#   that make up our software suite:
+#     - sparkd
+#     - TODO: pubsub
+#     - TODO: md-publisher
+#     - TODO: webapp (DSQA on the web)
+#     - TODO: api-server (websocket based)
+#   From inside a devcontainer, you can launch all services in separate containers
+#   on your machine by running:
+#
+#     tools/deploy.sh
+#
+#   This script builds release versions for each service, packaged (generally) in
+#   self-contained directories. Next, it runs a few "docker compose" commands to
+#   build docker images loaded with the self-contained binaries from the previous
+#   step, and start containers with those images to run each service. To view the
+#   commands that deploy.sh runs internally (without actually running them), run:
+#
+#     tools/deploy.sh --dry-run
+#
+#   For additional information/help, run:
+#
+#     tools/deploy.sh --help
+#
+
+### Sparkd ###
+# The internal image for sparkd to use. For more info, view:
+#   src/server/sparkd/Dockerfile
+SPARKD__IMAGE=sparkd
+# The config dir for this service to use
+SPARKD__CONFIG_DIR=src/app_sparkd/configurations/dev
+# Mount a specific volume or dir to "~/sparkdata/data" inside the docker.
+# Defaults to a volume named "sparkd_<config_port>" (e.g., sparkd_8000).
+# SPARKD__DATA_DIR=/home/bts/sparkdata/data
+SPARKD__SOURCE_DIR=install/sparkd-release-gcc
+SPARKD__RUNTIME_CONF_DIR=/home/ubuntu/8000/sparkdata/conf/
+SPARKD__CONFIG_PORT=8000
+SPARKD__QUICKBUS_PORT=8001
+SPARKD__SIM_FIX_PORT=8002
+SPARKD__SHM_SIZE=4gb
+SPARKD__PYTHON_REQUIREMENTS=requirements.txt
+
+# TODO: add config for other services (pubsub, md-publisher, webapp, api-server, etc.)
@@ -11,6 +11,7 @@ cmake-build-debug/
 **.vscode/*
 !.vscode/launch.json
 !.vscode/tasks.json
+!.vscode/*.env
 .vs
 obj/
 *.csproj.user
@@ -59,3 +60,5 @@ trace_data/
 .devcontainer/
 *.Generated.cs
 *.lst
+.env.local
+.secrets
@@ -1,6 +1,6 @@
 [submodule "externals"]
 	path = externals
-	url = git@bitbucket.org:bluetradesys/externals.git
+	url = https://bitbucket.org/bluetradesys/externals.git
 [submodule "vcpkg"]
 	path = vcpkg
 	url = https://github.com/microsoft/vcpkg.git
@@ -1,6 +1,14 @@
 {
  "version": "0.2.0",
  "configurations": [
+    {
+      "name": "Python Debugger: Current File with Arguments",
+      "type": "debugpy",
+      "request": "launch",
+      "program": "${file}",
+      "console": "integratedTerminal",
+      "args": "${command:pickArgs}"
+    },
    {
      "name": ".NET Core Attach",
      "type": "coreclr",
@@ -22,7 +30,7 @@
        "--config",
        "${workspaceFolder}/src/DataStreamSuite/DataStreamPublisher/Configurations/${input:dataStreamPublisherConfig}.json"
      ],
-      "cwd": "build/Debug/bin/net7.0",
+      "cwd": "build/Debug/bin/net8.0",
      "stopAtEntry": false,
      "console": "integratedTerminal"
    },
@@ -82,7 +90,7 @@
          "--config",
          "${workspaceFolder}/src/DataStreamSuite/DataStreamQueryAnalyzer/Configurations/DataStreamQueryAnalyzer.json"
        ],
-        "cwd": "build/Debug/bin/net7.0-windows",
+        "cwd": "build/Debug/bin/net8.0-windows",
        "env": {
          "PYTHON_EXE": "${workspaceFolder}/.venv/Scripts/python.exe"
        },
@@ -106,7 +114,7 @@
        "--config",
        "${workspaceFolder}/src/DataStreamSuite/PubSubServer/Configurations/${input:pubSubServerConfig}.json"
      ],
-      "cwd": "build/Debug/bin/net7.0",
+      "cwd": "build/Debug/bin/net8.0",
      "stopAtEntry": false,
      "console": "integratedTerminal"
    },
@@ -118,7 +126,7 @@
      "windows": {
        "preLaunchTask": "Build Spark (Debug)",
        "program": "Spark.exe",
-        "cwd": "build/Debug/bin/net7.0-windows",
+        "cwd": "build/Debug/bin/net8.0-windows",
      },
      "stopAtEntry": false,
      "console": "integratedTerminal"
@@ -130,7 +138,7 @@
      "program": "",
      "windows": {
        "program": "Spark.exe",
-        "cwd": "build/Debug/bin/net7.0-windows",
+        "cwd": "build/Debug/bin/net8.0-windows",
      },
      "stopAtEntry": false,
      "console": "integratedTerminal"
@@ -147,7 +155,7 @@
          "--sparkd",
          "${input:sparkConfigServer}"
        ],
-        "cwd": "build/Debug/bin/net7.0-windows",
+        "cwd": "build/Debug/bin/net8.0-windows",
      },
      "stopAtEntry": false,
      "console": "integratedTerminal"
@@ -160,7 +168,7 @@
      "windows": {
        "preLaunchTask": "Build Spark (Debug)",
        "program": "Spark.Console.exe",
-        "cwd": "build/Debug/bin/net7.0",
+        "cwd": "build/Debug/bin/net8.0",
        "args": [
          "test",
          "${input:sparkTest}"
@@ -176,7 +184,7 @@
      "program": "",
      "windows": {
        "program": "Spark.Console.exe",
-        "cwd": "build/Debug/bin/net7.0",
+        "cwd": "build/Debug/bin/net8.0",
        "args": [
          "test",
          "${input:sparkTest}"
@@ -191,24 +199,27 @@
      "request": "launch",
      "program": "",
      "linux": {
-        "preLaunchTask": "Build Sparkd (Debug)",
-        "program": "${workspaceFolder}/build/sparkd-debug-clang/server/sparkd",
-        "args": [
-          "run"
-        ],
-        "stopAtEntry": false,
-        "cwd": "${workspaceFolder}/build/sparkd-debug-clang/server",
-        "environment": [],
-        "externalConsole": false,
-        "MIMode": "gdb",
-        "setupCommands": [
-          {
-            "description": "Enable pretty-printing for gdb",
-            "text": "-enable-pretty-printing",
-            "ignoreFailures": true
-          }
-        ]
-      }
+        "program": "${workspaceFolder}/build/sparkd-debug-clang/src/app_sparkd/sparkd",
+      },
+      "args": [
+        "run"
+      ],
+      "cwd": "${workspaceFolder}/build/sparkd-debug-clang/src/app_sparkd",
+      "stopAtEntry": false,
+      "externalConsole": false,
+      "MIMode": "gdb",
+      "setupCommands": [
+        {
+          "description": "Enable pretty-printing for gdb",
+          "text": "-enable-pretty-printing",
+          "ignoreFailures": true
+        },
+        {
+          "description": "Set Disassembly Flavor to Intel",
+          "text": "-gdb-set disassembly-flavor intel",
+          "ignoreFailures": true
+        }
+      ]
    },
    {
      "name": "Sparkd (Skip Build)",
@@ -216,74 +227,27 @@
      "request": "launch",
      "program": "",
      "linux": {
-        "program": "${workspaceFolder}/build/sparkd-debug-clang/server/sparkd",
-        "args": [
-          "run"
-        ],
-        "stopAtEntry": false,
-        "cwd": "${workspaceFolder}/build/sparkd-debug-clang/server",
-        "environment": [],
-        "externalConsole": false,
-        "MIMode": "gdb",
-        "setupCommands": [
-          {
-            "description": "Enable pretty-printing for gdb",
-            "text": "-enable-pretty-printing",
-            "ignoreFailures": true
-          }
-        ]
-      }
-    },
-    {
-      "name": "Sparkd Test",
-      "type": "cppdbg",
-      "request": "launch",
-      "program": "",
-      "linux": {
-        "preLaunchTask": "Build Sparkd (Debug)",
-        "program": "${workspaceFolder}/build/sparkd-debug-clang/server/sparkd",
-        "args": [
-          "test",
-          "${input:sparkdTest}",
-        ],
-        "stopAtEntry": false,
-        "cwd": "${workspaceFolder}/build/sparkd-debug-clang/server",
-        "environment": [],
-        "externalConsole": false,
-        "MIMode": "gdb",
-        "setupCommands": [
-          {
-            "description": "Enable pretty-printing for gdb",
-            "text": "-enable-pretty-printing",
-            "ignoreFailures": true
-          }
-        ]
-      }
-    },
-    {
-      "name": "Sparkd Test (Skip Build)",
-      "type": "cppdbg",
-      "request": "launch",
-      "program": "",
-      "linux": {
-        "program": "${workspaceFolder}/build/sparkd-debug-clang/server/sparkd",
-        "args": [
-          "test",
-          "${input:sparkdTest}",
-        ],
-        "stopAtEntry": false,
-        "cwd": "${workspaceFolder}/build/sparkd-debug-clang/server",
-        "environment": [],
-        "externalConsole": false,
-        "MIMode": "gdb",
-        "setupCommands": [
-          {
-            "description": "Enable pretty-printing for gdb",
-            "text": "-enable-pretty-printing",
-            "ignoreFailures": true
-          }
-        ]
-      }
+        "program": "${workspaceFolder}/build/sparkd-debug-clang/src/app_sparkd/sparkd",
+      },
+      "args": [
+        "run"
+      ],
+      "cwd": "${workspaceFolder}/build/sparkd-debug-clang/src/app_sparkd",
+      "stopAtEntry": false,
+      "externalConsole": false,
+      "MIMode": "gdb",
+      "setupCommands": [
+        {
+          "description": "Enable pretty-printing for gdb",
+          "text": "-enable-pretty-printing",
+          "ignoreFailures": true
+        },
+        {
+          "description": "Set Disassembly Flavor to Intel",
+          "text": "-gdb-set disassembly-flavor intel",
+          "ignoreFailures": true
+        }
+      ]
    },
  ],
  "inputs": [
@@ -0,0 +1 @@
+PYTHONPATH=/workspaces/spark/build/sparkd-debug-clang/src/lib_python_interop;/workspaces/spark/src/lib_python_interop/python_interop_plugins
@@ -363,7 +363,7 @@
          "${workspaceFolder}/src/DataStreamSuite/DataStreamQueryAnalyzer/Configurations/DataStreamQueryAnalyzer.json",
        ],
        "options": {
-          "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net7.0-windows"
+          "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net8.0-windows"
        },
      },
      "icon": {
@@ -383,7 +383,7 @@
          "${workspaceFolder}/src/DataStreamSuite/DataStreamQueryAnalyzer/Configurations/DataStreamQueryAnalyzer.json",
        ],
        "options": {
-          "cwd": "${workspaceFolder}/build/Debug/bin/net7.0-windows"
+          "cwd": "${workspaceFolder}/build/Debug/bin/net8.0-windows"
        },
      },
      "icon": {
@@ -403,7 +403,7 @@
          "${workspaceFolder}/src/DataStreamSuite/DataStreamQueryAnalyzer/Configurations/DataStreamQueryAnalyzer.json",
        ],
        "options": {
-          "cwd": "${workspaceFolder}/build/Release/bin/net7.0-windows"
+          "cwd": "${workspaceFolder}/build/Release/bin/net8.0-windows"
        },
      },
      "icon": {
@@ -427,7 +427,7 @@
        "${workspaceFolder}/src/DataStreamSuite/DataStreamPublisher/Configurations/${input:dataStreamPublisherConfig}.json",
      ],
      "options": {
-        "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net7.0"
+        "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net8.0"
      },
      "icon": {
        "id": "run",
@@ -450,7 +450,7 @@
        "${workspaceFolder}/src/DataStreamSuite/DataStreamPublisher/Configurations/${input:dataStreamPublisherConfig}.json",
      ],
      "options": {
-        "cwd": "${workspaceFolder}/build/Debug/bin/net7.0"
+        "cwd": "${workspaceFolder}/build/Debug/bin/net8.0"
      },
      "icon": {
        "id": "run",
@@ -473,7 +473,7 @@
        "${workspaceFolder}/src/DataStreamSuite/DataStreamPublisher/Configurations/${input:dataStreamPublisherConfig}.json",
      ],
      "options": {
-        "cwd": "${workspaceFolder}/build/Release/bin/net7.0"
+        "cwd": "${workspaceFolder}/build/Release/bin/net8.0"
      },
      "icon": {
        "id": "run",
@@ -496,7 +496,7 @@
        "${workspaceFolder}/src/DataStreamSuite/PubSubServer/Configurations/${input:pubSubServerConfig}.json",
      ],
      "options": {
-        "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net7.0"
+        "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net8.0"
      },
      "icon": {
        "id": "run",
@@ -519,7 +519,7 @@
        "${workspaceFolder}/src/DataStreamSuite/PubSubServer/Configurations/${input:pubSubServerConfig}.json",
      ],
      "options": {
-        "cwd": "${workspaceFolder}/build/Debug/bin/net7.0"
+        "cwd": "${workspaceFolder}/build/Debug/bin/net8.0"
      },
      "icon": {
        "id": "run",
@@ -541,7 +541,7 @@
        "${workspaceFolder}/src/DataStreamSuite/PubSubServer/Configurations/${input:pubSubServerConfig}.json",
      ],
      "options": {
-        "cwd": "${workspaceFolder}/build/Debug/bin/net7.0"
+        "cwd": "${workspaceFolder}/build/Debug/bin/net8.0"
      },
      "icon": {
        "id": "run",
@@ -564,7 +564,7 @@
        "${workspaceFolder}/src/DataStreamSuite/PubSubServer/Configurations/${input:pubSubServerConfig}.json",
      ],
      "options": {
-        "cwd": "${workspaceFolder}/build/Release/bin/net7.0"
+        "cwd": "${workspaceFolder}/build/Release/bin/net8.0"
      },
      "icon": {
        "id": "run",
@@ -586,7 +586,7 @@
        "${workspaceFolder}/src/DataStreamSuite/PubSubServer/Configurations/${input:pubSubServerConfig}.json",
      ],
      "options": {
-        "cwd": "${workspaceFolder}/build/Release/bin/net7.0"
+        "cwd": "${workspaceFolder}/build/Release/bin/net8.0"
      },
      "icon": {
        "id": "run",
@@ -601,7 +601,7 @@
      "windows": {
        "command": "Spark.exe",
        "options": {
-          "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net7.0-windows"
+          "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net8.0-windows"
        },
      },
      "icon": {
@@ -617,7 +617,7 @@
      "windows": {
        "command": "Spark.exe",
        "options": {
-          "cwd": "${workspaceFolder}/build/Debug/bin/net7.0-windows"
+          "cwd": "${workspaceFolder}/build/Debug/bin/net8.0-windows"
        },
      },
      "icon": {
@@ -633,7 +633,7 @@
      "windows": {
        "command": "Spark.exe",
        "options": {
-          "cwd": "${workspaceFolder}/build/Release/bin/net7.0-windows"
+          "cwd": "${workspaceFolder}/build/Release/bin/net8.0-windows"
        },
      },
      "icon": {
@@ -648,7 +648,7 @@
      "windows": {
        "command": "Spark.exe",
        "options": {
-          "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net7.0-windows"
+          "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net8.0-windows"
        },
      },
      "icon": {
@@ -673,7 +673,7 @@
        "${input:sparkConfigQuery}",
      ],
      "options": {
-        "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net7.0"
+        "cwd": "${workspaceFolder}/build/${input:buildConfiguration}/bin/net8.0"
      },
      "icon": {
        "id": "run",
@@ -754,7 +754,7 @@
          "${input:sparkTest}"
        ],
        "options": {
-          "cwd": "${workspaceFolder}/build/Debug/bin/net7.0",
+          "cwd": "${workspaceFolder}/build/Debug/bin/net8.0",
        }
      },
    },
@@ -1,8 +1,10 @@
 cmake_minimum_required(VERSION 3.12)
 project(spark)
 include(GNUInstallDirs)
+include(${CMAKE_SOURCE_DIR}/cmake/GitVersion.cmake)
 set(CMAKE_CXX_STANDARD 20)

+get_version_from_git()
 if(WIN32)
  set(platform "windows")
 else()
@@ -20,9 +22,9 @@ set(
 # can run simultaneously without fighting over the same shm files (e.g., sparkd,
 # api server, etc.).
 set(SHARED_MEMORY_PREFIX "bts" CACHE STRING "Prefix to use when creating shared memory files")
-set(SPARK_BIN "${EXTERNALS_ROOT}/bin")
-set(SPARK_INCLUDE "${EXTERNALS_ROOT}/include")
-set(SPARK_LIB "${EXTERNALS_ROOT}/lib/$<CONFIG>")
+set(EXTERNALS_BIN "${EXTERNALS_ROOT}/bin")
+set(EXTERNALS_INCLUDE "${EXTERNALS_ROOT}/include")
+set(EXTERNALS_LIB "${EXTERNALS_ROOT}/lib/$<CONFIG>")
 set(BUILD_DOCS OFF CACHE BOOL "Build documentation")
 set(BUILD_SDK OFF CACHE BOOL "Build the sdk")
 set(EXPORT_MD_CONSUMER OFF CACHE BOOL "Export (extern) C functions for MD consumer interop")
@@ -34,8 +36,8 @@ else()
  set(BUILD_ADMIN_WEB_APP ON CACHE BOOL "Build the Admin WebApp")
 endif()

-include_directories(BEFORE SYSTEM ${SPARK_INCLUDE} ${EXTERNALS_ROOT}/include/zlib)
-link_directories(${SPARK_LIB})
+include_directories(BEFORE SYSTEM ${EXTERNALS_INCLUDE} ${EXTERNALS_ROOT}/include/zlib)
+link_directories(${EXTERNALS_LIB})

 add_compile_definitions(SHARED_MEMORY_PREFIX="${SHARED_MEMORY_PREFIX}")
 add_compile_definitions(APP_DATA_DIR="${APP_DATA_DIR}")
@@ -45,12 +47,8 @@ endif()
 add_compile_definitions(EXPORT_MD_CONSUMER="${EXPORT_MD_CONSUMER}")
 if(WIN32)
  # subdirs
-  add_subdirectory(src/lib)
+  add_subdirectory(src/lib_spark)
 else()
-  # make sparkd look for libspark.so in its directory
-  set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
-  set(CMAKE_INSTALL_RPATH ".")
-
  if(BUILD_SPARKD)
    # Note: All macros that begin w/ 'CCAPI' are ccapi's macros (defined and/or
    # read by their code). We override some below.
@@ -115,12 +113,15 @@ else()
  endif()

  # subdirs
+  add_subdirectory(src/lib_spark)
  if (BUILD_SPARKD)
-    add_subdirectory(src/lib_binance_execution)
-    add_subdirectory(src/server/sparkd)
+    add_subdirectory(src/lib_python_interop)
+    add_subdirectory(src/lib_onixs_fix)
+    add_subdirectory(src/lib_binance)
+    add_subdirectory(src/lib_okx_execution)
+    add_subdirectory(src/app_sparkd)
    add_subdirectory(src/data_files)
  endif()
-  add_subdirectory(src/lib)
  if (BUILD_ADMIN_WEB_APP)
    add_subdirectory(src/Spark.Admin.WebApp)
  endif()
@@ -130,37 +131,4 @@ else()
  if(BUILD_SDK)
    add_subdirectory(src/sdk)
  endif()
-
-  if(BUILD_SPARKD)
-    add_custom_command(
-      OUTPUT ${CMAKE_BINARY_DIR}/server
-      COMMAND mkdir -p ${CMAKE_BINARY_DIR}/server
-      COMMAND ln ARGS -sf ${CMAKE_BINARY_DIR}/src/server/sparkd/sparkd ${CMAKE_BINARY_DIR}/server
-      COMMAND ln ARGS -sf ${CMAKE_BINARY_DIR}/data_files ${CMAKE_BINARY_DIR}/server
-      COMMAND ln ARGS -sf ${CMAKE_BINARY_DIR}/src/lib/libspark.so ${CMAKE_BINARY_DIR}/server
-      COMMAND ln ARGS -sf ${EXTERNALS_ROOT}/lib/${CMAKE_BUILD_TYPE}/libonixs-fix-engine.so.4 ${CMAKE_BINARY_DIR}/server
-      
-      COMMAND
-        ln ARGS -sf
-        ${EXTERNALS_ROOT}/lib/Release/libOnixS.IceImpactMulticastPriceFeedHandlerCpp.so.3.16.0.0
-        ${CMAKE_BINARY_DIR}/server
-      COMMAND ln ARGS -sf ${EXTERNALS_ROOT}/lib/Release/libACE-5.7.5.so ${CMAKE_BINARY_DIR}/server
-      COMMAND mkdir ARGS -p ${CMAKE_BINARY_DIR}/server/plugins
-      COMMENT "Creating server runtime layout"
-      DEPENDS sparkd data_files_dir)
-
-    add_custom_target(server_layout ALL DEPENDS ${CMAKE_BINARY_DIR}/server)
-
-    install(
-      DIRECTORY "${CMAKE_BINARY_DIR}/server/plugins"
-      DESTINATION "${CMAKE_INSTALL_BINDIR}")
-    install(
-      FILES
-      "${SPARK_LIB}/libACE-5.7.5.so"
-      "${SPARK_LIB}/libOnixS.IceImpactMulticastPriceFeedHandlerCpp.so.3.16.0.0"
-      "${SPARK_LIB}/libonixs-fix-engine.so.4.10.1"
-      "${SPARK_LIB}/libonixs-fix-engine.so.4"
-      "${SPARK_LIB}/libonixs-fix-engine.so"
-      DESTINATION "${CMAKE_INSTALL_BINDIR}")
-  endif()
 endif()
@@ -31,9 +31,8 @@
        "CMAKE_SHARED_LINKER_FLAGS_RELEASE": "/OPT:REF /OPT:ICF /LTCG",
        "CMAKE_TOOLCHAIN_FILE": "${sourceDir}/vcpkg/scripts/buildsystems/vcpkg.cmake",
        "EXTERNALS_ROOT": "${sourceDir}/externals/windows",
-        "CONFIG_DEFAULTS_PATH": "config/profiles/default/*.conf",
-        "DOTNET_BINARY_DIR": "${sourceDir}/build/$<CONFIG>/bin/net7.0",
-        "DOTNET_WINDOWS_BINARY_DIR": "${sourceDir}/build/$<CONFIG>/bin/net7.0-windows",
+        "CONFIG_DEFAULTS_PATH": "spark/config/profiles/default/*.conf",
+        "DOTNET_BINARY_DIR": "${sourceDir}/build/$<CONFIG>/bin/net8.0;${sourceDir}/build/$<CONFIG>/bin/net8.0-windows",
        "EXPORT_MD_CONSUMER": {
          "type": "BOOL",
          "value": "ON"
@@ -58,12 +57,18 @@
        "APP_DATA_DIR_OVERRIDE": "${dollar}{SPARKD_DATA_DIR}",
        "CMAKE_BUILD_WITH_INSTALL_RPATH": {
          "type": "BOOL",
-          "value": "ON"
+          "value": "OFF"
        },
        "CMAKE_CXX_STANDARD": "20",
        "CMAKE_INSTALL_RPATH": ".",
        "CMAKE_INSTALL_PREFIX": "${sourceDir}/install/${presetName}",
+        "CMAKE_PREFIX_PATH": "${sourceDir}/cmake/;${sourceDir}/.venv/lib/python3.10/site-packages/pybind11/share/cmake/pybind11",
        "CMAKE_EXE_LINKER_FLAGS": "-Wno-undef",
+        "CMAKE_TOOLCHAIN_FILE": "${sourceDir}/vcpkg/scripts/buildsystems/vcpkg.cmake",
+        "DATABENTO_USE_EXTERNAL_JSON": {
+          "type": "BOOL",
+          "value": "ON"
+        },
        "EXTERNALS_ROOT": "${sourceDir}/externals/linux",
        "BUILD_SDK": {
          "type": "BOOL",
@@ -88,7 +93,7 @@
          "value": "ON"
        },
        "CCAPI_LOG_LEVEL": "Info",
-        "CONFIG_DEFAULTS_PATH": "config/profiles/md_dev/*.conf;config/profiles/default/*.conf"
+        "CONFIG_DEFAULTS_PATH": "spark/config/profiles/md_dev/*.conf;spark/config/profiles/default/*.conf"
      }
    },

@@ -99,7 +104,7 @@
      "cacheVariables": {
        "CMAKE_BUILD_TYPE": "Release",
        "CCAPI_LOG_LEVEL": "Warn",
-        "CONFIG_DEFAULTS_PATH": "config/profiles/md_prod/*.conf;config/profiles/default/*.conf"
+        "CONFIG_DEFAULTS_PATH": "spark/config/profiles/md_prod/*.conf;spark/config/profiles/default/*.conf"
      }
    },

@@ -181,8 +186,12 @@
        "CMAKE_CXX_FLAGS_DEBUG": "-g -fPIC -Wall -pedantic -Wextra -Werror -Wno-missing-braces -Wno-ignored-qualifiers --std=c++20 -fdiagnostics-color -DDEBUG",
        "CMAKE_CXX_FLAGS_RELEASE": "-fPIC -Wall -pedantic -Wextra -Werror -Wno-missing-braces -Wno-ignored-qualifiers --std=c++20 -fdiagnostics-color -fno-omit-frame-pointer -DNDEBUG -O3",
        "CMAKE_INSTALL_PREFIX": "${sourceDir}/install/${presetName}",
-        "CONFIG_DEFAULTS_PATH": "config/profiles/default/*.conf",
-        "DOTNET_BINARY_DIR": "${sourceDir}/build/$<CONFIG>/bin/net7.0",
+        "CMAKE_EXPORT_COMPILE_COMMANDS": {
+          "type": "BOOL",
+          "value": "ON"
+        },
+        "CONFIG_DEFAULTS_PATH": "spark/config/profiles/default/*.conf",
+        "DOTNET_BINARY_DIR": "${sourceDir}/build/$<CONFIG>/bin/net8.0",
        "EXPORT_MD_CONSUMER": {
          "type": "BOOL",
          "value": "ON"
@@ -222,7 +231,7 @@
      "cacheVariables": {
        "APP_DATA_DIR": "${dollar}{APPDATA}/bts/DataStream",
        "APP_DATA_DIR_OVERRIDE": "${dollar}{DATA_STREAM_DATA_DIR}",
-        "CONFIG_DEFAULTS_PATH": "config/profiles/default/*.conf;config/profiles/data_stream/*.conf",
+        "CONFIG_DEFAULTS_PATH": "spark/config/profiles/default/*.conf;spark/config/profiles/data_stream/*.conf",
        "SHARED_MEMORY_PREFIX": "data_stream"
      }
    },
@@ -257,8 +266,7 @@
        "CMAKE_CXX_COMPILER": "clang++",
        "CMAKE_CXX_FLAGS_DEBUG": "-g -fPIC -Wall -pedantic -Wextra -Werror -Wno-missing-braces -Wno-ignored-qualifiers --std=c++20 -fdiagnostics-color -DDEBUG",
        "CMAKE_CXX_FLAGS_RELEASE": "-fPIC -Wall -pedantic -Wextra -Werror -Wno-missing-braces -Wno-ignored-qualifiers --std=c++20 -fdiagnostics-color -fno-omit-frame-pointer -DNDEBUG -O3",
-        "CMAKE_INSTALL_PREFIX": "${sourceDir}/install/${presetName}",
-        "CONFIG_DEFAULTS_PATH": "config/profiles/default/*.conf;config/profiles/data_stream/*.conf",
+        "CONFIG_DEFAULTS_PATH": "spark/config/profiles/default/*.conf;spark/config/profiles/data_stream/*.conf",
        "DOTNET_BINARY_DIR": "${sourceDir}/build/$<CONFIG>/bin/net7.0",
        "EXPORT_MD_CONSUMER": {
          "type": "BOOL",
@@ -0,0 +1,7 @@
+include_guard(GLOBAL)
+
+macro(export_to_parent)
+  foreach(var IN ITEMS ${ARGN})
+    set(${var} ${${var}} PARENT_SCOPE)
+  endforeach()
+endmacro()
@@ -0,0 +1,48 @@
+include_guard(GLOBAL)
+
+function(get_version_from_git)
+  find_package(Git QUIET)
+  if(NOT Git_FOUND)
+    message(WARNING "Git not found")
+    return()
+  endif()
+
+  execute_process(
+    COMMAND ${GIT_EXECUTABLE} describe --tags --always
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    OUTPUT_VARIABLE GIT_TAG
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    RESULT_VARIABLE GIT_RESULT
+  )
+
+  if(NOT GIT_RESULT EQUAL 0)
+    message(WARNING "Failed to get git tag")
+    return()
+  endif()
+
+  execute_process(
+    COMMAND ${GIT_EXECUTABLE} rev-parse --short=7 HEAD
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    OUTPUT_VARIABLE GIT_COMMIT_SHORT_HASH
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+  set(PROJECT_VERSION_BUILD_METADATA ${GIT_COMMIT_SHORT_HASH})
+  set(PROJECT_VERSION_BUILD_METADATA ${GIT_COMMIT_SHORT_HASH} PARENT_SCOPE)
+
+  string(REGEX REPLACE "^v" "" CLEAN_TAG "${GIT_TAG}")
+  if(CLEAN_TAG MATCHES "^([0-9]+)\\.([0-9]+)\\.([0-9]+)(-.*)?$")
+    set(PROJECT_VERSION_MAJOR ${CMAKE_MATCH_1})
+    set(PROJECT_VERSION_MAJOR ${CMAKE_MATCH_1} PARENT_SCOPE)
+    set(PROJECT_VERSION_MINOR ${CMAKE_MATCH_2})
+    set(PROJECT_VERSION_MINOR ${CMAKE_MATCH_2} PARENT_SCOPE)
+    set(PROJECT_VERSION_PATCH ${CMAKE_MATCH_3})
+    set(PROJECT_VERSION_PATCH ${CMAKE_MATCH_3} PARENT_SCOPE)
+
+    set(PROJECT_VERSION "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}") 
+    set(PROJECT_VERSION "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}" PARENT_SCOPE)
+    set(PROJECT_VERSION_FULL "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}+${GIT_COMMIT_SHORT_HASH}")
+    set(PROJECT_VERSION_FULL "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}+${GIT_COMMIT_SHORT_HASH}" PARENT_SCOPE)
+  else()
+    message(WARNING "Tag '${CLEAN_TAG}' does not match semver format")
+  endif()
+endfunction()
@@ -0,0 +1,142 @@
+include_guard(DIRECTORY)
+include(${CMAKE_SOURCE_DIR}/cmake/ExportToParent.cmake)
+include(${CMAKE_SOURCE_DIR}/cmake/InstallBasic.cmake)
+include(${CMAKE_SOURCE_DIR}/cmake/ProtobufGenerateCpp.cmake)
+include(${CMAKE_SOURCE_DIR}/cmake/SetFirstDefined.cmake)
+include(${CMAKE_SOURCE_DIR}/cmake/safe_dep_glob.cmake)
+
+function(init_library)
+  set(_options SHARED STATIC)
+  set(_one_value_args
+    NAME
+    SOURCE_DIR
+    INCLUDE_DIR
+  )
+  set(_multi_value_args)
+  cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}" "${_multi_value_args}" ${ARGN})
+  if (_ARGS_SHARED AND _ARGS_STATIC)
+    message(FATAL_ERROR "Invalid args passed to init_library: cannot specify STATIC and SHARED")
+  endif()
+  set_first_defined(_name _ARGS_NAME PROJECT_NAME)
+  set_first_defined(_source_dir _ARGS_SOURCE_DIR _name)
+  set_first_defined(_include_dir _ARGS_INCLUDE_DIR _source_dir)
+
+  # Cpp sources
+  file(
+    GLOB_RECURSE ${_name}_SOURCES
+    RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
+    ${_source_dir}/*.cpp
+  )
+  # Note: cpp files inside 'tests' dir(s) are considered tests.
+  # Remove tests from main sources, and add them to test sources
+  foreach(item ${${_name}_SOURCES})
+    if(${item} MATCHES "tests/.*\.cpp$")
+      list(APPEND ${_name}_TEST_SOURCES ${item})
+    endif()
+  endforeach()
+  foreach(item ${${_name}_TEST_SOURCES})
+    list(REMOVE_ITEM ${_name}_SOURCES ${item})
+  endforeach()
+
+  # Proto sources 
+  file(
+    GLOB_RECURSE ${_name}_PROTO_SOURCES
+    RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
+    ${_source_dir}/protobufs/*.proto
+  )
+  update_deps_file("${${_name}_PROTO_SOURCES};")
+  protobuf_generate_cpp(
+    CXX_SOURCES ${_name}_CXX_PROTO_SOURCES
+    CXX_HEADERS ${_name}_CXX_PROTO_HEADERS
+    CXX_OUT_DIR ${CMAKE_CURRENT_BINARY_DIR}
+    PROTO_INCLUDE_DIRS
+      ${EXTERNALS_INCLUDE}
+      ${CMAKE_CURRENT_SOURCE_DIR}
+    PROTO_SOURCES
+      ${${_name}_PROTO_SOURCES}
+  )
+
+  export_to_parent(
+    ${_name}_SOURCES
+    ${_name}_TEST_SOURCES
+    ${_name}_PROTO_SOURCES
+    ${_name}_CXX_PROTO_SOURCES
+    ${_name}_CXX_PROTO_HEADERS
+  )
+
+  # Add main lib
+  if (_ARGS_STATIC)
+    add_library(${_name} STATIC ${${_name}_SOURCES} ${${_name}_CXX_PROTO_SOURCES})
+  elseif(_ARGS_SHARED)
+    add_library(${_name} SHARED ${${_name}_SOURCES} ${${_name}_CXX_PROTO_SOURCES})
+  else()
+    add_library(${_name} ${${_name}_SOURCES} ${${_name}_CXX_PROTO_SOURCES})
+  endif()
+  target_include_directories(
+    ${_name}
+    SYSTEM
+    BEFORE
+    PUBLIC
+      $<BUILD_INTERFACE:${EXTERNALS_ROOT}/include>
+      $<BUILD_INTERFACE:${EXTERNALS_ROOT}/include/zlib>
+  )
+  target_include_directories(
+    ${_name}
+    PUBLIC
+      $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+      $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+  )
+  # Include protos (if any)
+  if (${_name}_PROTO_SOURCES)
+    target_include_directories(
+      ${_name}
+      PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+    )
+  endif()
+  target_link_directories(
+    ${_name}
+    PUBLIC
+      $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+      $<BUILD_INTERFACE:${EXTERNALS_ROOT}/lib/$<CONFIG>>
+      $<INSTALL_INTERFACE:${CMAKE_INSTALL_LIBDIR}>
+  )
+  # Install main lib
+  foreach(_hdr ${${_name}_CXX_PROTO_HEADERS})
+    file(RELATIVE_PATH _relative_path ${CMAKE_CURRENT_BINARY_DIR} ${_hdr})
+    install(FILES ${_hdr} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${_relative_path})
+  endforeach()
+  install_basic(
+    NAME ${_name}
+    INCLUDE_DIR ${_include_dir}
+  )
+
+  # Add tests executable (if there are any)
+  if (${_name}_TEST_SOURCES AND NOT WIN32)
+    add_executable(${_name}-tests ${${_name}_TEST_SOURCES})
+
+    get_target_property(_lib_type ${_name} TYPE)
+    if (_lib_type STREQUAL "SHARED_LIBRARY")
+      # Set RPATH so the tests exe knows where to find the shared lib.
+      set_target_properties(
+        ${_name}-tests
+        PROPERTIES
+          BUILD_RPATH "$ORIGIN"
+          INSTALL_RPATH "$ORIGIN/../${CMAKE_INSTALL_LIBDIR}"
+      )
+    endif()
+
+    # Link main lib
+    target_link_directories(
+      ${_name}-tests
+      PRIVATE
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_LIBDIR}>
+    )
+    target_link_libraries(${_name}-tests PRIVATE ${_name})
+
+    # Catch2
+    find_package(Catch2 CONFIG REQUIRED COMPONENTS Catch2WithMain)
+    target_link_libraries(${_name}-tests PRIVATE Catch2::Catch2WithMain)
+  endif()
+endfunction()
@@ -0,0 +1,71 @@
+include_guard(DIRECTORY)
+include(GNUInstallDirs)
+include(${CMAKE_SOURCE_DIR}/cmake/ExportToParent.cmake)
+include(${CMAKE_SOURCE_DIR}/cmake/SetFirstDefined.cmake)
+
+function(init_python_module)
+  set(_options)
+  set(_one_value_args
+    NAME
+  )
+  set(_multi_value_args
+    SOURCES
+  )
+  cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}" "${_multi_value_args}" ${ARGN})
+  set_first_defined(_name _ARGS_NAME PROJECT_NAME)
+  set_first_defined(_sources _ARGS_SOURCES ${_name}_SOURCES)
+
+  set(module_proj ${_name}_module)
+  set(${module_proj}_SOURCES ${_sources})
+  pybind11_add_module(${module_proj} SHARED ${_sources})
+  target_link_libraries(
+    ${module_proj}
+    PUBLIC
+      pybind11::embed
+      spark
+      ${_name}
+  )
+  target_include_directories(
+    ${module_proj}
+    PRIVATE
+      $<BUILD_INTERFACE:${pybind11_INCLUDE_DIRS}>
+  )
+  target_include_directories(
+    ${module_proj}
+    PUBLIC
+      ${Python3_INCLUDE_DIRS}
+      $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+      $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+  )
+  add_custom_command(
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/stubs/${_name}.pyi
+    DEPENDS ${_name} ${module_proj}
+    COMMAND PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR} pybind11-stubgen --numpy-array-use-type-var --ignore-invalid-expressions '.*' ${_name}_module
+    COMMENT "Generating py stubs"
+  )
+  add_custom_target(
+    "${_name}_py_stubs"
+    ALL
+    DEPENDS
+      ${CMAKE_CURRENT_BINARY_DIR}/stubs/${_name}.pyi
+  )
+  install(
+    TARGETS ${module_proj}
+    EXPORT ${module_proj}Targets
+    RUNTIME
+      DESTINATION ${CMAKE_INSTALL_BINDIR}
+    LIBRARY
+      DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    ARCHIVE
+      DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  )
+  foreach(dir ${pybind11_INCLUDE_DIRS})
+    install(DIRECTORY ${dir} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+  endforeach()
+  install(
+    EXPORT ${module_proj}Targets
+    FILE ${module_proj}Targets.cmake
+    NAMESPACE ${_name}::
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${_name}
+  )
+endfunction()
@@ -0,0 +1,65 @@
+include_guard(DIRECTORY)
+include(GNUInstallDirs)
+
+function(init_python_plugin)
+  set(_options)
+  set(_one_value_args NAME PLUGIN_NAME)
+  set(_multi_value_args SOURCES)
+  cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}" "${_multi_value_args}" ${ARGN})
+  set_first_defined(_name _ARGS_NAME PROJECT_NAME)
+  set(_plugin_name ${_ARGS_PLUGIN_NAME})
+  if (NOT DEFINED _ARGS_PLUGIN_NAME)
+    set(_plugin_name ${_name}_plugins)
+  endif()
+  set(${_plugin_name}_SOURCES ${_ARGS_SOURCES})
+  if (NOT DEFINED _ARGS_SOURCES)
+    file(
+      GLOB_RECURSE ${_plugin_name}_SOURCES
+      RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
+      ${_plugin_name}/*.py)
+  endif()
+  set(src_outs)
+  foreach(_src ${${_plugin_name}_SOURCES})
+    set(_src_in ${CMAKE_CURRENT_SOURCE_DIR}/${_src})
+    set(_src_out ${CMAKE_CURRENT_BINARY_DIR}/${_src})
+    add_custom_command(
+      OUTPUT ${_src_out}
+      COMMAND ${CMAKE_COMMAND} -E copy ${_src_in} ${_src_out}
+      DEPENDS ${_src_in}
+      COMMENT "Copying ${_plugin_name} plugin ${_src} to ${_src_out}"
+    )
+    list(APPEND src_outs ${_src_out})
+  endforeach()
+  
+  add_custom_target(copy_${_plugin_name} ALL DEPENDS ${src_outs})
+  
+  add_library(${_plugin_name} INTERFACE)
+  add_library(${_name}::${_plugin_name} ALIAS ${_plugin_name})
+  
+  set_target_properties(
+    ${_plugin_name}
+    PROPERTIES
+      INTERFACE_PYTHON_SCRIPTS_DIR
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/${_plugin_name}>$<INSTALL_INTERFACE:${CMAKE_INSTALL_BINDIR}/${_plugin_name}>
+  )
+  
+  set_target_properties(
+    ${_plugin_name}
+    PROPERTIES
+    INTERFACE_PYTHON_SCRIPTS $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/${${_plugin_name}_SOURCES}>$<INSTALL_INTERFACE:${CMAKE_INSTALL_BINDIR}/${${_plugin_name}_SOURCES}>
+  )
+  
+  install(
+    TARGETS ${_plugin_name}
+    EXPORT ${_plugin_name}Targets
+    DESTINATION ${CMAKE_INSTALL_BINDIR}
+  )
+  
+  install(
+    EXPORT ${_plugin_name}Targets
+    FILE ${_plugin_name}Targets.cmake
+    NAMESPACE ${_name}::
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${_name}
+  )
+  install(DIRECTORY ${_plugin_name} DESTINATION ${CMAKE_INSTALL_BINDIR})
+endfunction()
@@ -0,0 +1,39 @@
+include_guard(DIRECTORY)
+include(GNUInstallDirs)
+include(${CMAKE_SOURCE_DIR}/cmake/PackBasic.cmake)
+include(${CMAKE_SOURCE_DIR}/cmake/SetFirstDefined.cmake)
+
+function(install_basic)
+  set(_options)
+  set(_one_value_args NAME INCLUDE_DIR)
+  set(_multi_value_args)
+  cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}" "${_multi_value_args}" ${ARGN})
+  set_first_defined(_name _ARGS_NAME PROJECT_NAME)
+  set_first_defined(_include_dir _ARGS_INCLUDE_DIR _name)
+
+  file(
+    GLOB_RECURSE ${_name}_HEADERS
+    RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
+    ${_include_dir}/*.h)
+
+  target_sources(${_name}
+    PUBLIC
+      FILE_SET HEADERS FILES ${${_name}_HEADERS})
+
+  install(
+    TARGETS ${_name}
+    EXPORT ${_name}Targets
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    FILE_SET HEADERS DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+  )
+
+  install(
+    EXPORT ${_name}Targets
+    FILE ${_name}Targets.cmake
+    NAMESPACE ${_name}::
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${_name})
+
+  pack_basic()
+endfunction()
@@ -0,0 +1,44 @@
+include_guard(DIRECTORY)
+include(CMakePackageConfigHelpers)
+include(${CMAKE_SOURCE_DIR}/cmake/SetFirstDefined.cmake)
+
+function(pack_basic)
+  set(_options)
+  set(_one_value_args NAME)
+  set(_multi_value_args)
+  cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}" "${_multi_value_args}" ${ARGN})
+  set_first_defined(_name _ARGS_NAME PROJECT_NAME)
+
+  find_package(Git QUIET)
+
+  if(GIT_FOUND)
+    execute_process(
+      COMMAND ${GIT_EXECUTABLE} describe --tags --always --dirty
+      WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+      OUTPUT_VARIABLE PROJECT_VERSION
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+  endif()
+
+  if(NOT GIT_FOUND OR PROJECT_VERSION STREQUAL "")
+    set(PROJECT_VERSION "0.0.0")
+  endif()
+
+  write_basic_package_version_file(
+    "${CMAKE_CURRENT_BINARY_DIR}/${_name}ConfigVersion.cmake"
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY AnyNewerVersion
+  )
+
+  configure_package_config_file(
+    "${CMAKE_CURRENT_SOURCE_DIR}/Config.cmake.in"
+    "${CMAKE_CURRENT_BINARY_DIR}/${_name}Config.cmake"
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${_name}
+  )
+
+  install(
+    FILES
+      "${CMAKE_CURRENT_BINARY_DIR}/${_name}Config.cmake"
+      "${CMAKE_CURRENT_BINARY_DIR}/${_name}ConfigVersion.cmake"
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${_name})
+endfunction()
@@ -1,12 +1,23 @@
-set(Protobuf_PROTOC_EXECUTABLE "${SPARK_BIN}/protoc")
-set(PROTOBUF_INCLUDE_DIRS "${SPARK_INCLUDE}")
+set(Protobuf_PROTOC_EXECUTABLE "${EXTERNALS_BIN}/protoc")
+set(PROTOBUF_INCLUDE_DIRS "${EXTERNALS_INCLUDE}")
 set(PROTOBUF_STATIC_LIB "libprotobuf")
+set(_protobuf_src_dir ${CMAKE_SOURCE_DIR}/src/lib_spark)
+set(_protobuf_bin_dir ${CMAKE_BINARY_DIR}/src/lib_spark)

-function(Protobuf_Generate_Cpp SRCS HDRS)
-  set(${SRCS})
-  set(${HDRS})
+function(Protobuf_Generate_Cpp)
+  set(_options)
+  set(_one_value_args CXX_SOURCES CXX_HEADERS CXX_OUT_DIR)
+  set(_multi_value_args PROTO_INCLUDE_DIRS PROTO_SOURCES)
+  cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}" "${_multi_value_args}" ${ARGN})
+  set(${_ARGS_CXX_SOURCES})
+  set(${_ARGS_CXX_HEADERS})

-  foreach(FIL ${ARGN})
+  set(_proto_include_cli_args)
+  foreach(_dir ${_ARGS_PROTO_INCLUDE_DIRS})
+    list(APPEND _proto_include_cli_args -I ${_dir})
+  endforeach()
+
+  foreach(FIL ${_ARGS_PROTO_SOURCES})
    get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
    get_filename_component(FIL_WE ${FIL} NAME_WE)
    get_filename_component(FIL_DIR ${FIL} DIRECTORY)
@@ -14,48 +25,56 @@ function(Protobuf_Generate_Cpp SRCS HDRS)
      set(FIL_WE "${FIL_DIR}/${FIL_WE}")
    endif()

-    list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc")
-    list(APPEND ${HDRS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h")
+    list(APPEND ${_ARGS_CXX_SOURCES} "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.pb.cc")
+    list(APPEND ${_ARGS_CXX_HEADERS} "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.pb.h")

    add_custom_command(
-      OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc"
-             "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h"
+      OUTPUT "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.pb.cc"
+             "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.pb.h"
      COMMAND
-        ${Protobuf_PROTOC_EXECUTABLE} ARGS --cpp_out=${CMAKE_BINARY_DIR}/src -I
-        ${PROTOBUF_INCLUDE_DIRS} -I ${CMAKE_SOURCE_DIR}/src ${ABS_FIL}
+        ${Protobuf_PROTOC_EXECUTABLE} ARGS --cpp_out=${_ARGS_CXX_OUT_DIR} ${_proto_include_cli_args} ${ABS_FIL}
      DEPENDS ${ABS_FIL}
      COMMENT "Running C++ protocol buffer compiler on ${FIL}"
      VERBATIM)
  endforeach()

-  set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
+  set_source_files_properties(${${_ARGS_CXX_SOURCES}} ${${_ARGS_CXX_HEADERS}} PROPERTIES GENERATED TRUE)

  # remove some warnings from protobuf generated files
  if(WIN32)
-    set_source_files_properties(${${SRCS}} PROPERTIES COMPILE_FLAGS
+    set_source_files_properties(${${_ARGS_CXX_SOURCES}} PROPERTIES COMPILE_FLAGS
                                                      "/wd4309 /wd4838")
  else()
    set_source_files_properties(
-      ${${SRCS}}
+      ${${_ARGS_CXX_SOURCES}}
      PROPERTIES
        COMPILE_FLAGS
        "-Wno-unused-parameter -Wno-effc++ -Wno-pedantic -Wno-sign-compare -Wno-uninitialized"
    )
  endif()

-  set(${SRCS}
-      ${${SRCS}}
+  set(${_ARGS_CXX_SOURCES}
+      ${${_ARGS_CXX_SOURCES}}
      PARENT_SCOPE)
-  set(${HDRS}
-      ${${HDRS}}
+  set(${_ARGS_CXX_HEADERS}
+      ${${_ARGS_CXX_HEADERS}}
      PARENT_SCOPE)
 endfunction()

-function(Service_Compiler_Generate_Cpp SRCS HDRS)
-  set(${SRCS})
-  set(${HDRS})
+function(Service_Compiler_Generate_Cpp)
+  set(_options)
+  set(_one_value_args CXX_SOURCES CXX_HEADERS CXX_OUT_DIR)
+  set(_multi_value_args PROTO_INCLUDE_DIRS PROTO_SOURCES)
+  cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}" "${_multi_value_args}" ${ARGN})
+  set(${_ARGS_CXX_SOURCES})
+  set(${_ARGS_CXX_HEADERS})

-  foreach(FIL ${ARGN})
+  set(_proto_include_cli_args)
+  foreach(_dir ${_ARGS_PROTO_INCLUDE_DIRS})
+    list(APPEND _proto_include_cli_args -I ${_dir})
+  endforeach()
+
+  foreach(FIL ${_ARGS_PROTO_SOURCES})
    get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
    get_filename_component(FIL_WE ${FIL} NAME_WE)
    get_filename_component(FIL_DIR ${FIL} DIRECTORY)
@@ -63,58 +82,58 @@ function(Service_Compiler_Generate_Cpp SRCS HDRS)
      set(FIL_WE "${FIL_DIR}/${FIL_WE}")
    endif()

-    list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc")
-    list(APPEND ${HDRS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h")
+    list(APPEND ${_ARGS_CXX_SOURCES} "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.pb.cc")
+    list(APPEND ${_ARGS_CXX_HEADERS} "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.pb.h")

-    list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.client.pb.cc")
-    list(APPEND ${HDRS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.client.pb.h")
+    list(APPEND ${_ARGS_CXX_SOURCES} "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.client.pb.cc")
+    list(APPEND ${_ARGS_CXX_HEADERS} "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.client.pb.h")

-    list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.server.pb.cc")
-    list(APPEND ${HDRS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.server.pb.h")
+    list(APPEND ${_ARGS_CXX_SOURCES} "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.server.pb.cc")
+    list(APPEND ${_ARGS_CXX_HEADERS} "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.server.pb.h")

    set(TEMPLATES
-        ${CMAKE_CURRENT_SOURCE_DIR}/api/service_compiler/templates/cpp/client.pb.cc
-        ${CMAKE_CURRENT_SOURCE_DIR}/api/service_compiler/templates/cpp/client.pb.h
-        ${CMAKE_CURRENT_SOURCE_DIR}/api/service_compiler/templates/cpp/server.pb.cc
-        ${CMAKE_CURRENT_SOURCE_DIR}/api/service_compiler/templates/cpp/server.pb.h
+        ${CMAKE_SOURCE_DIR}/src/lib_spark/spark/api/service_compiler/templates/cpp/client.pb.cc
+        ${CMAKE_SOURCE_DIR}/src/lib_spark/spark/api/service_compiler/templates/cpp/client.pb.h
+        ${CMAKE_SOURCE_DIR}/src/lib_spark/spark/api/service_compiler/templates/cpp/server.pb.cc
+        ${CMAKE_SOURCE_DIR}/src/lib_spark/spark/api/service_compiler/templates/cpp/server.pb.h
    )

+    set(_plugin_py ${CMAKE_SOURCE_DIR}/src/lib_spark/spark/api/service_compiler/plugin.py)
    if(WIN32)
+      set(_plugin_cmd ${CMAKE_SOURCE_DIR}/src/lib_spark/spark/api/service_compiler/plugin.cmd)
      add_custom_command(
-        OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc"
-               "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h"
-               "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.client.pb.cc"
-               "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.client.pb.h"
-               "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.server.pb.cc"
-               "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.server.pb.h"
+        OUTPUT "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.pb.cc"
+               "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.pb.h"
+               "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.client.pb.cc"
+               "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.client.pb.h"
+               "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.server.pb.cc"
+               "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.server.pb.h"
        COMMAND SET PYTHONPATH=${SPARK_PYTHON}
        COMMAND ${CMAKE_SOURCE_DIR}/.venv/Scripts/activate.bat
        COMMAND
-          ${Protobuf_PROTOC_EXECUTABLE} ARGS --cpp_out=${CMAKE_BINARY_DIR}/src
-          --plugin=protoc-gen-service=${CMAKE_SOURCE_DIR}/src/lib/api/service_compiler/plugin.cmd
-          --service_out=lang=cpp:${CMAKE_BINARY_DIR}/src -I
-          ${PROTOBUF_INCLUDE_DIRS} -I ${CMAKE_SOURCE_DIR}/src ${ABS_FIL}
-        DEPENDS ${ABS_FIL} ${TEMPLATES}
-                ${CMAKE_CURRENT_SOURCE_DIR}/api/service_compiler/plugin.py
+          ${Protobuf_PROTOC_EXECUTABLE} ARGS --cpp_out=${_ARGS_CXX_OUT_DIR}
+          --plugin=protoc-gen-service=${_plugin_cmd}
+          --service_out=lang=cpp:${_ARGS_CXX_OUT_DIR} -I
+          ${PROTOBUF_INCLUDE_DIRS} -I ${_protobuf_src_dir} ${ABS_FIL}
+        DEPENDS ${ABS_FIL} ${TEMPLATES} ${_plugin_cmd} ${_plugin_py}
        COMMENT "Running C++ service compiler on ${FIL}"
        VERBATIM)
    else()
      add_custom_command(
-        OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc"
-               "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h"
-               "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.client.pb.cc"
-               "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.client.pb.h"
-               "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.server.pb.cc"
-               "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.server.pb.h"
+        OUTPUT "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.pb.cc"
+               "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.pb.h"
+               "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.client.pb.cc"
+               "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.client.pb.h"
+               "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.server.pb.cc"
+               "${_ARGS_CXX_OUT_DIR}/${FIL_WE}.server.pb.h"
        COMMAND ${CMAKE_SOURCE_DIR}/tools/venv_exec.sh
        ARGS
          ${Protobuf_PROTOC_EXECUTABLE}
-          --cpp_out=${CMAKE_BINARY_DIR}/src
-          --plugin=protoc-gen-service=${CMAKE_SOURCE_DIR}/src/lib/api/service_compiler/plugin.py
-          --service_out=lang=cpp,make_file_name=${ABS_FIL}:${CMAKE_BINARY_DIR}/src
-          -I ${PROTOBUF_INCLUDE_DIRS} -I ${CMAKE_SOURCE_DIR}/src ${ABS_FIL}
-        DEPENDS ${ABS_FIL} ${TEMPLATES}
-                ${CMAKE_CURRENT_SOURCE_DIR}/api/service_compiler/plugin.py
+          --cpp_out=${_ARGS_CXX_OUT_DIR}
+          --plugin=protoc-gen-service=${_plugin_py}
+          --service_out=lang=cpp,make_file_name=${ABS_FIL}:${_ARGS_CXX_OUT_DIR}
+          ${_proto_include_cli_args} ${ABS_FIL}
+        DEPENDS ${ABS_FIL} ${TEMPLATES} ${_plugin_py}
        COMMENT "Running C++ service compiler on ${FIL}"
        VERBATIM)
    endif()
@@ -123,22 +142,22 @@ function(Service_Compiler_Generate_Cpp SRCS HDRS)

  # remove some warnings from protobuf generated files
  if(WIN32)
-    set_source_files_properties(${${SRCS}} PROPERTIES COMPILE_FLAGS
+    set_source_files_properties(${${_ARGS_CXX_SOURCES}} PROPERTIES COMPILE_FLAGS
                                                      "/wd4309 /wd4838")
  else()
    set_source_files_properties(
-      ${${SRCS}}
+      ${${_ARGS_CXX_SOURCES}}
      PROPERTIES
        COMPILE_FLAGS
        "-Wno-unused-parameter -Wno-effc++ -Wno-pedantic -Wno-sign-compare -Wno-uninitialized"
    )
  endif()

-  set(${SRCS}
-      ${${SRCS}}
+  set(${_ARGS_CXX_SOURCES}
+      ${${_ARGS_CXX_SOURCES}}
      PARENT_SCOPE)
-  set(${HDRS}
-      ${${HDRS}}
+  set(${_ARGS_CXX_HEADERS}
+      ${${_ARGS_CXX_HEADERS}}
      PARENT_SCOPE)

 endfunction()
@@ -0,0 +1,83 @@
+include_guard(GLOBAL)
+
+function(protobuf_generate_cpp)
+  set(_options)
+  set(_one_value_args
+    CXX_SOURCES
+    CXX_HEADERS
+    CXX_OUT_DIR
+    PROTOC
+  )
+  set(_multi_value_args
+    PROTO_INCLUDE_DIRS
+    PROTO_SOURCES
+  )
+  cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}" "${_multi_value_args}" ${ARGN})
+
+  if (NOT DEFINED _ARGS_PROTOC)
+    if (WIN32)
+      set(_ARGS_PROTOC "${EXTERNALS_BIN}/protoc.exe")
+    else()
+      set(_ARGS_PROTOC "${EXTERNALS_BIN}/protoc")
+    endif()
+  endif()
+  set(${_ARGS_CXX_SOURCES})
+  set(${_ARGS_CXX_HEADERS})
+
+  set(_proto_include_cli_args)
+  foreach(_dir ${_ARGS_PROTO_INCLUDE_DIRS})
+    list(APPEND _proto_include_cli_args -I ${_dir})
+  endforeach()
+
+  foreach(_fil ${_ARGS_PROTO_SOURCES})
+    get_filename_component(_abs_fil ${_fil} ABSOLUTE)
+    get_filename_component(_fil_we ${_fil} NAME_WE)
+    get_filename_component(_fil_dir ${_fil} DIRECTORY)
+    if(_fil_dir)
+      set(_fil_we "${_fil_dir}/${_fil_we}")
+    endif()
+    list(APPEND ${_ARGS_CXX_SOURCES} "${_ARGS_CXX_OUT_DIR}/${_fil_we}.pb.cc")
+    list(APPEND ${_ARGS_CXX_HEADERS} "${_ARGS_CXX_OUT_DIR}/${_fil_we}.pb.h")
+    message(STATUS "add_custom_command for ${_fil} -> ${_ARGS_CXX_OUT_DIR}/${_fil_we}.pb.h")
+    # TODO: Pass proto sources by relative path (so this fn can be called from
+    # arbitrary subdirs).
+    add_custom_command(
+      OUTPUT
+        "${_ARGS_CXX_OUT_DIR}/${_fil_we}.pb.cc"
+        "${_ARGS_CXX_OUT_DIR}/${_fil_we}.pb.h"
+      COMMAND
+        ${_ARGS_PROTOC}
+      ARGS
+        --cpp_out=${_ARGS_CXX_OUT_DIR} ${_proto_include_cli_args} ${_abs_fil}
+      DEPENDS ${_abs_fil}
+      COMMENT "Running C++ protocol buffer compiler on ${_fil}"
+      VERBATIM
+    )
+  endforeach()
+
+  set_source_files_properties(
+    ${${_ARGS_CXX_SOURCES}}
+    ${${_ARGS_CXX_HEADERS}}
+    PROPERTIES
+      GENERATED TRUE
+  )
+
+  # remove some warnings from protobuf generated files
+  if(WIN32)
+    set_source_files_properties(
+      ${${_ARGS_CXX_SOURCES}}
+      PROPERTIES
+        COMPILE_FLAGS "/wd4309 /wd4838"
+    )
+  else()
+    set_source_files_properties(
+      ${${_ARGS_CXX_SOURCES}}
+      PROPERTIES
+        COMPILE_FLAGS "-Wno-unused-parameter -Wno-effc++ -Wno-pedantic -Wno-sign-compare -Wno-uninitialized"
+    )
+  endif()
+
+  set(${_ARGS_CXX_SOURCES} ${${_ARGS_CXX_SOURCES}} PARENT_SCOPE)
+  set(${_ARGS_CXX_HEADERS} ${${_ARGS_CXX_HEADERS}} PARENT_SCOPE)
+endfunction()
+
@@ -0,0 +1,61 @@
+include_guard(GLOBAL)
+
+function(protobuf_generate_cpp_config)
+  set(_options)
+  set(_one_value_args
+    PROTO_SOURCES_HEADER
+    PROTO_DEFAULTS_HEADER
+  )
+  set(_multi_value_args
+    PROTO_SOURCES
+    PROTO_DEFAULTS
+  )
+  cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}" "${_multi_value_args}" ${ARGN})
+
+  # Configure the 'config_proto_files' header. It provides an array of strings populated with the
+  # files in PROTO_SOURCES. At runtime, we use this array to generate a special 'config' proto
+  # message with fields for each message defined in said files. A global instance of this 'config'
+  # proto is then constructed, and populated with [compile-time] defaults, and [runtime] overrides
+  # (i.e., in spark.conf). Calls to `bts::config::get<T>()` retrieve the value from the field
+  # associated with type `T` in this global instance.
+  message(STATUS "PROTO_SOURCES: ${_ARGS_PROTO_SOURCES}")
+  message(STATUS "PROTO_SOURCES_HEADER: ${_ARGS_PROTO_SOURCES_HEADER}")
+  message(STATUS "PROTO_DEFAULTS_HEADER: ${_ARGS_PROTO_DEFAULTS_HEADER}")
+  if (_ARGS_PROTO_SOURCES_HEADER)
+    set(PROTO_SOURCES)
+    set(PROTO_SOURCES_CXX_ARRAY_ITEMS "")
+    foreach(_proto_path ${_ARGS_PROTO_SOURCES})
+      list(APPEND PROTO_SOURCES ${_proto_path})
+      string(APPEND PROTO_SOURCES_CXX_ARRAY_ITEMS "\"${_proto_path}\",\n")
+    endforeach()
+    list(LENGTH PROTO_SOURCES PROTO_SOURCES_LENGTH)
+    message(STATUS "CONFIGURING PROTO_SOURCES_HEADER): ${_ARGS_PROTO_SOURCES_HEADER}")
+    configure_file(${CMAKE_SOURCE_DIR}/cmake/config_proto_files.h.in ${_ARGS_PROTO_SOURCES_HEADER})
+  endif()
+
+  # Generate static defaults. Ideally, this would be a single string, but we use an array because
+  # the compiler complains if the string is longer than 65k.
+  set(_cfg_defaults_str "inline const char * config_static_defaults[] = { ")
+
+  foreach(_cfg_file_path ${_ARGS_PROTO_DEFAULTS})
+    file(READ ${_cfg_file_path} _cfg_file_content)
+    string(REPLACE "\"" "\\\"" _cfg_file_content_escaped ${_cfg_file_content})
+    string(REPLACE "\n" ";" _cfg_lines ${_cfg_file_content_escaped})
+
+    foreach(_line ${_cfg_lines})
+      string(APPEND _cfg_defaults_str "\n  \"${_line}\",")
+    endforeach(_line)
+  endforeach(_cfg_file_path)
+
+  string(APPEND _cfg_defaults_str "};")
+  set(_old_cfg_defaults_str "")
+
+  if(EXISTS ${_ARGS_PROTO_DEFAULTS_HEADER})
+    file(READ ${_ARGS_PROTO_DEFAULTS_HEADER} _old_cfg_defaults_str)
+  endif()
+
+  if(NOT _cfg_defaults_str STREQUAL _old_cfg_defaults_str)
+    file(WRITE "${_ARGS_PROTO_DEFAULTS_HEADER}" "${_cfg_defaults_str}")
+  endif()
+endfunction()
+
@@ -10,7 +10,7 @@ function(protobuf_generate_fs)
    set(_ARGS_TARGET_NAME "${PROJECT_NAME}_generate_fs_protos")
  endif()
  if (NOT DEFINED _ARGS_PROTOC)
-    set(_ARGS_PROTOC "${SPARK_BIN}/protoc")
+    set(_ARGS_PROTOC "${EXTERNALS_BIN}/protoc")
  endif()

  set(_proto_include_cli_args)
@@ -27,8 +27,8 @@ function(protobuf_generate_fs)
  endforeach()

  set(_venv_exec ${CMAKE_SOURCE_DIR}/tools/venv_exec.sh)
-  set(_plugin_py ${CMAKE_SOURCE_DIR}/src/lib/api/service_compiler/plugin.py)
-  set(_template_fs ${CMAKE_SOURCE_DIR}/src/lib/api/service_compiler/templates/fs/fable.fs)
+  set(_plugin_py ${CMAKE_SOURCE_DIR}/src/lib_spark/spark/api/service_compiler/plugin.py)
+  set(_template_fs ${CMAKE_SOURCE_DIR}/src/lib_spark/spark/api/service_compiler/templates/fs/fable.fs)
  add_custom_command(
    OUTPUT ${_outputs}
    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
@@ -0,0 +1,10 @@
+include_guard(GLOBAL)
+
+macro(set_first_defined RESULT)
+  foreach(_arg ${ARGN})
+    if (DEFINED ${_arg})
+      set(${RESULT} ${${_arg}})
+      break()
+    endif()
+  endforeach()
+endmacro()
@@ -0,0 +1,39 @@
+include_guard(DIRECTORY)
+include(${CMAKE_SOURCE_DIR}/cmake/SymLink.cmake)
+
+function(sym_link_python_module)
+  set(_options)
+  set(_one_value_args LIB_NAME MODULE_NAME PLUGIN_NAME)
+  set(_multi_value_args)
+  cmake_parse_arguments(_ARGS "${_options}" "${_one_value_args}"
+                        "${_multi_value_args}" ${ARGN})
+  if(NOT DEFINED _ARGS_LIB_NAME)
+    message(
+      FATAL_ERROR "LIB_NAME must be specified for sym_link_python_module()")
+  endif()
+  set(_lib_name ${_ARGS_LIB_NAME})
+  set(_module_name ${_ARGS_MODULE_NAME})
+  if(NOT DEFINED _ARGS_MODULE_NAME)
+    set(_module_name ${_lib_name}_module)
+  endif()
+  set(_plugin_name ${_ARGS_PLUGIN_NAME})
+  set(_deps ${_lib_name} ${_module_name})
+  if(DEFINED _ARGS_PLUGIN_NAME)
+    list(APPEND _deps ${_plugin_name} copy_${_plugin_name})
+  endif()
+  add_dependencies(${PROJECT_NAME} ${_deps})
+  sym_link_local_lib(${_lib_name})
+  set(_module_suffix cpython-310-x86_64-linux-gnu.so)
+  sym_link_file(
+    SOURCE
+    ${CMAKE_BINARY_DIR}/src/lib_${_lib_name}/${_module_name}.${_module_suffix}
+    DEST
+    ${CMAKE_CURRENT_BINARY_DIR}/${_module_name}.${_module_suffix}
+    INSTALL_DEST
+    ${CMAKE_INSTALL_BINDIR}/)
+  if(DEFINED _ARGS_PLUGIN_NAME)
+    get_target_property(plugins ${_plugin_name} INTERFACE_PYTHON_SCRIPTS_DIR)
+    sym_link_dir(TARGET_NAME ${PROJECT_NAME}_link_${_plugin_name} SOURCE
+                 ${plugins} DEST ${CMAKE_CURRENT_BINARY_DIR}/${_plugin_name})
+  endif()
+endfunction()
@@ -0,0 +1,11 @@
+#pragma once
+
+#include <array>
+
+namespace bts::@PROJECT_NAME@::protobufs {
+
+inline std::array<const char *, @PROTO_SOURCES_LENGTH@> config_proto_files = {
+@PROTO_SOURCES_CXX_ARRAY_ITEMS@
+};
+
+} // namespace bts::@PROJECT_NAME@::protobufs
@@ -0,0 +1,11 @@
+#ifndef BTS_SPARK_VERSION_H
+#define BTS_SPARK_VERSION_H
+
+#define BTS_SPARK_VERSION_MAJOR @PROJECT_VERSION_MAJOR@
+#define BTS_SPARK_VERSION_MINOR @PROJECT_VERSION_MINOR@
+#define BTS_SPARK_VERSION_PATCH @PROJECT_VERSION_PATCH@
+#define BTS_SPARK_VERSION_BUILD_METADATA @PROJECT_VERSION_BUILD_METADATA@
+#define BTS_SPARK_VERSION "@PROJECT_VERSION@"
+#define BTS_SPARK_VERSION_FULL "@PROJECT_VERSION_FULL@"
+
+#endif
@@ -1,24 +0,0 @@
-cmake_minimum_required(VERSION 3.5)
-
-# Explicitly set policy to convert relative paths to absolute (although this is a default policy,
-# setting it explicitly prevents a compile-warning)
-cmake_policy(SET CMP0076 NEW)
-
-# add protos to the library to facilitate source_group
-target_sources(libspark PUBLIC ${Config_Protos} ${NonConfig_Protos} ${Service_Protos})
-
-function(assign_source_group)
-  foreach(_source IN ITEMS ${ARGN})
-    if(IS_ABSOLUTE "${_source}")
-      file(RELATIVE_PATH _source_rel "${CMAKE_CURRENT_SOURCE_DIR}" "${_source}")
-    else()
-      set(_source_rel "${_source}")
-    endif()
-    get_filename_component(_source_path "${_source_rel}" PATH)
-    string(REPLACE "/" "\\" _source_path_msvc "${_source_path}")
-    source_group("${_source_path_msvc}" FILES "${_source}")
-    set(SOURCE_FILES "${_source}")
-  endforeach()
-endfunction(assign_source_group)
-
-assign_source_group(${SparkLib_Sources} ${Config_Protos} ${NonConfig_Protos} ${Service_Protos})
@@ -0,0 +1,114 @@
+services:
+  sparkd:
+    volumes:
+      - ${SPARKD__DATA_DIR:-sparkd_data}:/home/bts/sparkdata/data
+    build:
+      dockerfile: src/app_sparkd/Dockerfile
+      args:
+        - IMAGE=${SPARKD__IMAGE}
+        - SOURCE_DIR=${SPARKD__SOURCE_DIR}
+        - CONFIG_DIR=${SPARKD__CONFIG_DIR}
+        - PYTHON_REQUIREMENTS=${SPARKD__PYTHON_REQUIREMENTS}
+    shm_size: "${SPARKD__SHM_SIZE:-512mb}"
+    command: >
+      sh -c "
+        echo bts | sudo -S chown -R bts:bts /home/bts/sparkdata/data
+        if [ -e "/home/bts/sparkdata/data/logging.sparkd/log" ]; then
+          mv "/home/bts/sparkdata/data/logging.sparkd/log" "/home/bts/sparkdata/data/logging.sparkd/log_$(date '+%Y%m%d-%H%M')"
+        fi
+        if [ -e "/home/bts/sparkdata/conf/.env.local" ]; then
+          echo 'Sourcing /home/bts/sparkdata/conf/.env.local'
+          set -a
+          . /home/bts/sparkdata/conf/.env.local
+          set +a
+        fi
+        if [ -d /home/bts/sparkdata/conf/plugins ]; then
+          echo 'Copying /home/bts/sparkdata/conf/plugins to runtime dir (/home/bts/bin)'
+          cp -r /home/bts/sparkdata/conf/plugins /home/bts/bin/
+        fi
+        ./sparkd run"
+    env_file:
+      - .env
+      - ${SPARKD__CONFIG_DIR}/.env
+    ports:
+      - "${SPARKD__CONFIG_PORT}:${SPARKD__CONFIG_PORT}"
+      - "${SPARKD__QUICKBUS_PORT}:${SPARKD__QUICKBUS_PORT}"
+      - "${SPARKD__SIM_FIX_PORT}:${SPARKD__SIM_FIX_PORT}"
+    deploy:
+      resources:
+        limits:
+          memory: "${SPARKD__MEMORY:-4gb}"
+
+  sparkd-symbols:
+    volumes:
+      - ${SPARKD__DATA_DIR:-sparkd_data}:/home/bts/sparkdata/data
+      - ${SPARKD__RUNTIME_CONF_DIR:-sparkd_conf}:/home/bts/sparkdata/conf
+    build:
+      dockerfile: src/app_sparkd/Dockerfile
+      args:
+        - IMAGE=${SPARKD__IMAGE}
+        - SOURCE_DIR=${SPARKD__SOURCE_DIR}
+        - CONFIG_DIR=${SPARKD__CONFIG_DIR}
+        - PYTHON_REQUIREMENTS=${SPARKD__PYTHON_REQUIREMENTS}
+    shm_size: "${SPARKD__SHM_SIZE:-512mb}"
+    command: >
+      sh -c "
+        echo bts | sudo -S chown -R bts:bts /home/bts/sparkdata
+        if [ -e "/home/bts/sparkdata/data/logging.sparkd/log" ]; then
+          mv "/home/bts/sparkdata/data/logging.sparkd/log" "/home/bts/sparkdata/data/logging.sparkd/log_$(date '+%Y%m%d-%H%M')"
+        fi
+        ls -alh /home/bts/sparkdata/conf/
+        cat /home/bts/sparkdata/conf/.env.local
+        if [ -e "/home/bts/sparkdata/conf/.env.local" ]; then
+          echo 'Sourcing /home/bts/sparkdata/conf/.env.local'
+          set -a
+          . /home/bts/sparkdata/conf/.env.local
+          set +a
+        fi
+        if [ -d /home/bts/sparkdata/conf/plugins ]; then
+          echo 'Copying /home/bts/sparkdata/conf/plugins to runtime dir (/home/bts/bin)'
+          cp -r /home/bts/sparkdata/conf/plugins /home/bts/bin/
+        fi
+        ./sparkd run"
+    env_file:
+      - .env
+      - ${SPARKD__CONFIG_DIR}/.env
+    ports:
+      - "${SPARKD__CONFIG_PORT}:${SPARKD__CONFIG_PORT}"
+      - "${SPARKD__QUICKBUS_PORT}:${SPARKD__QUICKBUS_PORT}"
+      - "${SPARKD__SIM_FIX_PORT}:${SPARKD__SIM_FIX_PORT}"
+    deploy:
+      restart_policy:
+        condition: any
+        delay: 3s
+      resources:
+        limits:
+          memory: "${SPARKD__MEMORY:-4gb}"
+
+  sparkd-tail:
+    image: bluetradingsystems/linux_dotnet7
+    volumes:
+      - type: volume
+        read_only: true
+        source: sparkd_data
+        target: /home/bts/sparkdata/data/logging.sparkd
+        volume:
+          subpath: logging.sparkd
+    command: ["tail", "-f", "/home/bts/sparkdata/data/logging.sparkd/log"]
+
+  sparkd-ping-test:
+    depends_on:
+      - sparkd
+    profiles:
+      - ping-test
+    build:
+      context: .
+      dockerfile_inline: |
+        FROM bluetradingsystems/linux_dotnet7
+        USER "root"
+        RUN apt-get update && apt-get -y install iputils-ping
+    command: [ "ping", "sparkd" ]
+
+volumes:
+  sparkd_data:
+    name: "sparkd_${SPARKD__CONFIG_PORT:-8000}"
@@ -124,8 +124,8 @@ service OrderService {
 ```
 ### C++ Example
 ```cpp
-#include "lib/api/public/ServiceContext.h"
-#include "lib/api/services/OrderService.client.pb.h"
+#include "spark/api/public/ServiceContext.h"
+#include "spark/api/services/OrderService.client.pb.h"
 using namespace bts::api;
 ServiceContext ctx;
 auto orders = ctx.locate<orderman::OrderService>();
@@ -29,9 +29,9 @@ namespace sample {
 ```

 ```cpp
-#include "lib/api/public/ServiceContext.h"
-#include "spark/lib/domain_model/Security.h"
-#include "lib/api/services/MarketDataService.client.pb.h"
+#include "spark/api/public/ServiceContext.h"
+#include "spark/domain_model/Security.h"
+#include "spark/api/services/MarketDataService.client.pb.h"
 #include <thread>

 using namespace bts::api;
@@ -0,0 +1,38 @@
+FROM ubuntu:22.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y pkg-config
+RUN apt-get update && apt-get install -y locales
+RUN apt-get update && apt-get install -y ca-certificates
+RUN apt-get update && apt-get install -y libssh2-1-dev
+RUN apt-get update && apt-get install -y software-properties-common
+RUN apt-get update && apt-get install -y sudo
+
+# GCC
+ARG gcc_major=13
+RUN add-apt-repository ppa:ubuntu-toolchain-r/test \
+  && apt-get update \
+  && apt-get install -y g++-$gcc_major
+
+RUN apt-get update \
+  && apt-get install -y dotnet7
+
+RUN locale-gen en_US.UTF-8
+
+ARG docker_user="bts"
+ARG docker_uid="1000"
+ARG docker_pass="bts"
+
+RUN \
+  groupadd -g "$docker_uid" "$docker_user" \
+  && useradd \
+  -m \
+  -u "$docker_uid" \
+  -g "$docker_uid" \
+  -G sudo \
+  --password "$(openssl passwd -1 "$docker_pass")" \
+  "$docker_user"
+
+USER bts
+WORKDIR /home/bts
@@ -1,22 +1,42 @@
 astroid==2.7.3
 autopep8==1.5.7
+blinker==1.9.0
+boto3==1.37.9
+botocore==1.37.9
 certifi==2023.5.7
 charset-normalizer==3.1.0
+click==8.1.8
 colorama==0.4.4
+Flask==3.1.0
 idna==3.4
 isort==5.9.3
+itsdangerous==2.2.0
+Jinja2==3.1.6
+jmespath==1.0.1
 lazy-object-proxy==1.6.0
+MarkupSafe==3.0.2
 mccabe==0.6.1
+numpy==2.2.6
 platformdirs==2.3.0
 protobuf==4.21.12
 pybars3==0.9.7
+pybind11==2.13.6
+pybind11-stubgen==2.5.3
+pybit==5.11.0
 pycodestyle==2.7.0
 pycparser==2.20
+pycryptodome==3.23.0
 pylint==2.10.2
 PyMeta3==0.5.1
+python-dateutil==2.9.0.post0
+python-dotenv==1.0.1
 requests==2.31.0
+s3transfer==0.11.4
+six==1.17.0
 termcolor==1.1.0
 toml==0.10.2
 urllib3==2.0.3
+websocket-client==1.8.0
+Werkzeug==3.1.3
 wrapt==1.12.1
 yapf==0.31.0
@@ -18,6 +18,14 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "spark_websocket", "src\clie
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "spark_api_server", "src\client\spark_api_server\spark_api_server.csproj", "{2B8C5D01-FF78-4BFA-B332-5E430586DAF9}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DataStreamCore", "src\DataStreamSuite\DataStreamCore\DataStreamCore.csproj", "{4E4F491F-C688-43C4-88DA-AC92BC5FA1B8}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DataStream", "src\DataStreamSuite\DataStream\DataStream.csproj", "{2AC54ADC-3246-427E-9CA9-FEA2DBCB9432}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SharedStreams", "src\DataStreamSuite\SharedStreams\SharedStreams.csproj", "{4E96E5CC-7791-40B3-A8A1-C34FBB736B3B}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PubSub", "src\DataStreamSuite\PubSub\PubSub.csproj", "{51C40BA9-F226-4A35-939D-1ED6F5FF7299}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -90,6 +98,38 @@ Global
 		{2B8C5D01-FF78-4BFA-B332-5E430586DAF9}.Release|x64.Build.0 = Release|x64
 		{2B8C5D01-FF78-4BFA-B332-5E430586DAF9}.RelWithDebInfo|x64.ActiveCfg = Release|x64
 		{2B8C5D01-FF78-4BFA-B332-5E430586DAF9}.RelWithDebInfo|x64.Build.0 = Release|x64
+		{4E4F491F-C688-43C4-88DA-AC92BC5FA1B8}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{4E4F491F-C688-43C4-88DA-AC92BC5FA1B8}.Debug|x64.Build.0 = Debug|Any CPU
+		{4E4F491F-C688-43C4-88DA-AC92BC5FA1B8}.MinSizeRel|x64.ActiveCfg = Debug|Any CPU
+		{4E4F491F-C688-43C4-88DA-AC92BC5FA1B8}.MinSizeRel|x64.Build.0 = Debug|Any CPU
+		{4E4F491F-C688-43C4-88DA-AC92BC5FA1B8}.Release|x64.ActiveCfg = Release|Any CPU
+		{4E4F491F-C688-43C4-88DA-AC92BC5FA1B8}.Release|x64.Build.0 = Release|Any CPU
+		{4E4F491F-C688-43C4-88DA-AC92BC5FA1B8}.RelWithDebInfo|x64.ActiveCfg = Debug|Any CPU
+		{4E4F491F-C688-43C4-88DA-AC92BC5FA1B8}.RelWithDebInfo|x64.Build.0 = Debug|Any CPU
+		{2AC54ADC-3246-427E-9CA9-FEA2DBCB9432}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{2AC54ADC-3246-427E-9CA9-FEA2DBCB9432}.Debug|x64.Build.0 = Debug|Any CPU
+		{2AC54ADC-3246-427E-9CA9-FEA2DBCB9432}.MinSizeRel|x64.ActiveCfg = Debug|Any CPU
+		{2AC54ADC-3246-427E-9CA9-FEA2DBCB9432}.MinSizeRel|x64.Build.0 = Debug|Any CPU
+		{2AC54ADC-3246-427E-9CA9-FEA2DBCB9432}.Release|x64.ActiveCfg = Release|Any CPU
+		{2AC54ADC-3246-427E-9CA9-FEA2DBCB9432}.Release|x64.Build.0 = Release|Any CPU
+		{2AC54ADC-3246-427E-9CA9-FEA2DBCB9432}.RelWithDebInfo|x64.ActiveCfg = Debug|Any CPU
+		{2AC54ADC-3246-427E-9CA9-FEA2DBCB9432}.RelWithDebInfo|x64.Build.0 = Debug|Any CPU
+		{4E96E5CC-7791-40B3-A8A1-C34FBB736B3B}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{4E96E5CC-7791-40B3-A8A1-C34FBB736B3B}.Debug|x64.Build.0 = Debug|Any CPU
+		{4E96E5CC-7791-40B3-A8A1-C34FBB736B3B}.MinSizeRel|x64.ActiveCfg = Debug|Any CPU
+		{4E96E5CC-7791-40B3-A8A1-C34FBB736B3B}.MinSizeRel|x64.Build.0 = Debug|Any CPU
+		{4E96E5CC-7791-40B3-A8A1-C34FBB736B3B}.Release|x64.ActiveCfg = Release|Any CPU
+		{4E96E5CC-7791-40B3-A8A1-C34FBB736B3B}.Release|x64.Build.0 = Release|Any CPU
+		{4E96E5CC-7791-40B3-A8A1-C34FBB736B3B}.RelWithDebInfo|x64.ActiveCfg = Debug|Any CPU
+		{4E96E5CC-7791-40B3-A8A1-C34FBB736B3B}.RelWithDebInfo|x64.Build.0 = Debug|Any CPU
+		{51C40BA9-F226-4A35-939D-1ED6F5FF7299}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{51C40BA9-F226-4A35-939D-1ED6F5FF7299}.Debug|x64.Build.0 = Debug|Any CPU
+		{51C40BA9-F226-4A35-939D-1ED6F5FF7299}.MinSizeRel|x64.ActiveCfg = Debug|Any CPU
+		{51C40BA9-F226-4A35-939D-1ED6F5FF7299}.MinSizeRel|x64.Build.0 = Debug|Any CPU
+		{51C40BA9-F226-4A35-939D-1ED6F5FF7299}.Release|x64.ActiveCfg = Release|Any CPU
+		{51C40BA9-F226-4A35-939D-1ED6F5FF7299}.Release|x64.Build.0 = Release|Any CPU
+		{51C40BA9-F226-4A35-939D-1ED6F5FF7299}.RelWithDebInfo|x64.ActiveCfg = Debug|Any CPU
+		{51C40BA9-F226-4A35-939D-1ED6F5FF7299}.RelWithDebInfo|x64.Build.0 = Debug|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
@@ -1,14 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Google.Protobuf" Version="3.24.3" />
-    <PackageReference Include="YaccLexTools" Version="1.2.0" />
+    <PackageReference Include="YaccLexTools" Version="1.2.3" />
  </ItemGroup>

  <ItemGroup>
@@ -24,8 +24,6 @@ namespace QUT.GplexBuffers
        public BufferException(string message) : base(message) { }
        public BufferException(string message, Exception innerException)
            : base(message, innerException) { }
-        protected BufferException(SerializationInfo info, StreamingContext context)
-            : base(info, context) { }
    }

    internal abstract class ScanBuff
@@ -60,12 +58,10 @@ namespace QUT.GplexBuffers
            return new BuildBuffer(source);
        }

-#if (!BYTEMODE)
        public static ScanBuff GetBuffer(Stream source, int fallbackCodePage)
        {
            return new BuildBuffer(source, fallbackCodePage);
        }
-#endif // !BYTEMODE
 #endif // !NOFILES
    }

@@ -353,17 +349,15 @@ namespace QUT.GplexBuffers
        {
            FileStream fStrm = (stream as FileStream);
            if (fStrm != null) FileName = fStrm.Name;
-            NextBlk = BlockReaderFactory.Raw(stream);
+            NextBlk = BlockReaderFactory.Get(stream);
        }

-#if (!BYTEMODE)
        public BuildBuffer(Stream stream, int fallbackCodePage)
        {
            FileStream fStrm = (stream as FileStream);
            if (fStrm != null) FileName = fStrm.Name;
            NextBlk = BlockReaderFactory.Get(stream, fallbackCodePage);
        }
-#endif

        /// <summary>
        /// Marks a conservative lower bound for the buffer,
@@ -434,43 +428,19 @@ namespace QUT.GplexBuffers
    //
    internal static class BlockReaderFactory
    {
-        public static BlockReader Raw(Stream stream)
-        {
-            return delegate(char[] block, int index, int number)
-            {
-                byte[] b = new byte[number];
-                int count = stream.Read(b, 0, number);
-                int i = 0;
-                int j = index;
-                for (; i < count; i++, j++)
-                    block[j] = (char)b[i];
-                return count;
-            };
-        }

-#if (!BYTEMODE)
-        public static BlockReader Get(Stream stream, int fallbackCodePage)
+        public static BlockReader Get(Stream stream, int fallbackCodePage = -2)
        {
            Encoding encoding;
            int preamble = Preamble(stream);

            if (preamble != 0)  // There is a valid BOM here!
                encoding = Encoding.GetEncoding(preamble);
-            else if (fallbackCodePage == -1) // Fallback is "raw" bytes
-                return Raw(stream);
-            else if (fallbackCodePage != -2) // Anything but "guess"
+            else if (fallbackCodePage >= 0) // Anything but "guess"
                encoding = Encoding.GetEncoding(fallbackCodePage);
            else // This is the "guess" option
-            {
-                int guess = new Guesser(stream).GuessCodePage();
-                stream.Seek(0, SeekOrigin.Begin);
-                if (guess == -1) // ==> this is a 7-bit file
-                    encoding = Encoding.ASCII;
-                else if (guess == 65001)
-                    encoding = Encoding.UTF8;
-                else             // ==> use the machine default
-                    encoding = Encoding.Default;
-            }
+                encoding = GuessEncoding(stream);
+
            StreamReader reader = new StreamReader(stream, encoding);
            return reader.Read;
        }
@@ -488,6 +458,14 @@ namespace QUT.GplexBuffers
            int b2 = stream.ReadByte();
            if (b0 == 0xef && b1 == 0xbb && b2 == 0xbf)
                return 65001; // UTF8
+
+            int b3 = stream.ReadByte();
+            // Check for UTF-32 BOM (Byte Order Mark)
+            if (b0 == 0x00 && b1 == 0x00 && b2 == 0xFE && b3 == 0xFF)
+                return 12001; // UTF-32BE
+            if (b0 == 0xFF && b1 == 0xFE && b2 == 0x00 && b3 == 0x00)
+                return 12000; // UTF-32LE
+
            //
            // There is no unicode preamble, so we
            // return denoter for the machine default.
@@ -495,7 +473,150 @@ namespace QUT.GplexBuffers
            stream.Seek(0, SeekOrigin.Begin);
            return 0;
        }
-#endif // !BYTEMODE
+
+        private static Encoding GuessEncoding(Stream stream)
+        {
+            stream.Seek(0, SeekOrigin.Begin);
+            if (IsUtf16(stream, out Encoding encoding))
+            {
+                stream.Seek(0, SeekOrigin.Begin);
+                return encoding;
+            }
+
+            stream.Seek(0, SeekOrigin.Begin);
+            if (IsUtf8(stream))
+            {
+                stream.Seek(0, SeekOrigin.Begin);
+                return Encoding.UTF8;
+            }
+
+            stream.Seek(0, SeekOrigin.Begin);
+            if (IsAscii(stream))
+            {
+                stream.Seek(0, SeekOrigin.Begin);
+                return Encoding.ASCII;
+            }
+
+#if !NET462_OR_GREATER
+            stream.Seek(0, SeekOrigin.Begin);
+            if (IsLatin1(stream))
+            {
+                stream.Seek(0, SeekOrigin.Begin);
+                return Encoding.Latin1;
+            }
+#endif
+            stream.Seek(0, SeekOrigin.Begin);
+            return Encoding.Default;
+        }
+
+        private static bool IsUtf8(Stream stream)
+        {
+            int b;
+            while ((b = stream.ReadByte()) != -1)
+            {
+                if ((b & 0x80) == 0) // 0xxxxxxx
+                {
+                    continue;
+                }
+                else if ((b & 0xE0) == 0xC0) // 110xxxxx 10xxxxxx
+                {
+                    if (!IsValidUtf8ContinuationByte(stream)) return false;
+                }
+                else if ((b & 0xF0) == 0xE0) // 1110xxxx 10xxxxxx 10xxxxxx
+                {
+                    if (!IsValidUtf8ContinuationByte(stream) || !IsValidUtf8ContinuationByte(stream)) return false;
+                }
+                else if ((b & 0xF8) == 0xF0) // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+                {
+                    if (!IsValidUtf8ContinuationByte(stream) || !IsValidUtf8ContinuationByte(stream) || !IsValidUtf8ContinuationByte(stream)) return false;
+                }
+                else
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        private static bool IsValidUtf8ContinuationByte(Stream stream)
+        {
+            int b = stream.ReadByte();
+            return b != -1 && (b & 0xC0) == 0x80; // 10xxxxxx
+        }
+
+        private static bool IsUtf16(Stream stream, out Encoding encoding)
+        {
+            encoding = Encoding.Default;
+
+            if (stream.Length >= 2)
+            {
+                // Read the first two bytes
+                int b0 = stream.ReadByte();
+                int b1 = stream.ReadByte();
+
+                // Check for UTF-16 BOM (Byte Order Mark)
+                if (b0 == 0xFF && b1 == 0xFE)
+                {
+                    encoding = Encoding.Unicode;
+                    return true; // UTF-16LE
+                }
+                if (b0 == 0xFE && b1 == 0xFF)
+                {
+                    encoding = Encoding.BigEndianUnicode;
+                    return true; // UTF-16BE
+                }
+
+                // Reset the stream position
+                stream.Seek(0, SeekOrigin.Begin);
+
+                // Check for common UTF-16 patterns
+                byte[] buffer = new byte[2];
+                while (stream.Read(buffer, 0, 2) == 2)
+                {
+                    if (buffer[0] == 0x00 && buffer[1] != 0x00)
+                    {
+                        encoding = Encoding.BigEndianUnicode;
+                        return true; // Likely UTF-16BE
+                    }
+                    if (buffer[0] != 0x00 && buffer[1] == 0x00)
+                    {
+                        encoding = Encoding.Unicode;
+                        return true; // Likely UTF-16LE
+                    }
+                }
+            }
+
+            return false;
+        }
+
+        private static bool IsAscii(Stream stream)
+        {
+            int b;
+            while ((b = stream.ReadByte()) != -1)
+            {
+                // Latin1 includes byte values from 0x00 to 0xFF
+                if (b > 0x7F)
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        private static bool IsLatin1(Stream stream)
+        {
+            int b;
+            while ((b = stream.ReadByte()) != -1)
+            {
+                // Latin1 includes byte values from 0x00 to 0xFF
+                if (b > 0xFF)
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+
    }
 #endif // !NOFILES
    #endregion Buffer classes
@@ -540,180 +661,6 @@ namespace QUT.GplexBuffers
            return 0;
        }
    }
-#region guesser
-#if (!BYTEMODE)
-    // ==============================================================
-    // ============          Encoding Guesser           =============
-    // ==============================================================
-
-    /// <summary>
-    /// This class provides a simple finite state automaton that
-    /// scans the file looking for (1) valid UTF-8 byte patterns,
-    /// (2) bytes >= 0x80 which are not part of a UTF-8 sequence.
-    /// The method then guesses whether it is UTF-8 or maybe some 
-    /// local machine default encoding.  This works well for the
-    /// various Latin encodings.
-    /// </summary>
-    internal class Guesser
-    {
-        ScanBuff buffer;
-
-        public int GuessCodePage() { return Scan(); }
-
-        const int maxAccept = 10;
-        const int initial = 0;
-        const int eofNum = 0;
-        const int goStart = -1;
-        const int INITIAL = 0;
-        const int EndToken = 0;
-
-        #region user code
-        /* 
-         *  Reads the bytes of a file to determine if it is 
-         *  UTF-8 or a single-byte code page file.
-         */
-        public long utfX;
-        public long uppr;
-        #endregion user code
-
-        int state;
-        int currentStart = startState[0];
-        int code;
-
-        #region ScannerTables
-        static int[] startState = new int[] { 11, 0 };
-
-        #region CharacterMap
-        static sbyte[] map = new sbyte[256] {
-/*     '\0' */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
-/*   '\x10' */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
-/*   '\x20' */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
-/*      '0' */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
-/*      '@' */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
-/*      'P' */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
-/*      '`' */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
-/*      'p' */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
-/*   '\x80' */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 
-/*   '\x90' */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 
-/*   '\xA0' */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 
-/*   '\xB0' */ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 
-/*   '\xC0' */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
-/*   '\xD0' */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
-/*   '\xE0' */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 
-/*   '\xF0' */ 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5 };
-        #endregion
-
-        static sbyte[][] nextState = new sbyte[][] {
-            new sbyte[] {0, 0, 0, 0, 0, 0},
-            new sbyte[] {-1, -1, 10, -1, -1, -1},
-            new sbyte[] {-1, -1, -1, -1, -1, -1},
-            new sbyte[] {-1, -1, 8, -1, -1, -1},
-            new sbyte[] {-1, -1, 5, -1, -1, -1},
-            new sbyte[] {-1, -1, 6, -1, -1, -1},
-            new sbyte[] {-1, -1, 7, -1, -1, -1},
-            null,
-            new sbyte[] {-1, -1, 9, -1, -1, -1},
-            null,
-            null,
-            new sbyte[] {-1, 1, 2, 3, 4, 2}
-        };
-
-
-        [SuppressMessage("Microsoft.Performance", "CA1810:InitializeReferenceTypeStaticFieldsInline")]
-        // Reason for suppression: cannot have self-reference in array initializer.
-        static Guesser()
-        {
-            nextState[7] = nextState[2];
-            nextState[9] = nextState[2];
-            nextState[10] = nextState[2];
-        }
-
-        int NextState()
-        {
-            if (code == ScanBuff.EndOfFile)
-                return eofNum;
-            else
-                return nextState[state][map[code]];
-        }
-        #endregion
-
-        public Guesser(System.IO.Stream file) { SetSource(file); }
-
-        public void SetSource(System.IO.Stream source)
-        {
-            this.buffer = new BuildBuffer(source);
-            code = buffer.Read();
-        }
-
-        int Scan()
-        {
-            for (; ; )
-            {
-                int next;
-                state = currentStart;
-                while ((next = NextState()) == goStart)
-                    code = buffer.Read();
-
-                state = next;
-                code = buffer.Read();
-
-                while ((next = NextState()) > eofNum)
-                {
-                    state = next;
-                    code = buffer.Read();
-                }
-                if (state <= maxAccept)
-                {
-                    #region ActionSwitch
-#pragma warning disable 162
-                    switch (state)
-                    {
-                        case eofNum:
-                            switch (currentStart)
-                            {
-                                case 11:
-                                    if (utfX == 0 && uppr == 0) return -1; /* raw ascii */
-                                    else if (uppr * 10 > utfX) return 0;   /* default code page */
-                                    else return 65001;                     /* UTF-8 encoding */
-                                    break;
-                            }
-                            return EndToken;
-                        case 1: // Recognized '{Upper128}',	Shortest string "\xC0"
-                        case 2: // Recognized '{Upper128}',	Shortest string "\x80"
-                        case 3: // Recognized '{Upper128}',	Shortest string "\xE0"
-                        case 4: // Recognized '{Upper128}',	Shortest string "\xF0"
-                            uppr++;
-                            break;
-                        case 5: // Recognized '{Utf8pfx4}{Utf8cont}',	Shortest string "\xF0\x80"
-                            uppr += 2;
-                            break;
-                        case 6: // Recognized '{Utf8pfx4}{Utf8cont}{2}',	Shortest string "\xF0\x80\x80"
-                            uppr += 3;
-                            break;
-                        case 7: // Recognized '{Utf8pfx4}{Utf8cont}{3}',	Shortest string "\xF0\x80\x80\x80"
-                            utfX += 3;
-                            break;
-                        case 8: // Recognized '{Utf8pfx3}{Utf8cont}',	Shortest string "\xE0\x80"
-                            uppr += 2;
-                            break;
-                        case 9: // Recognized '{Utf8pfx3}{Utf8cont}{2}',	Shortest string "\xE0\x80\x80"
-                            utfX += 2;
-                            break;
-                        case 10: // Recognized '{Utf8pfx2}{Utf8cont}',	Shortest string "\xC0\x80"
-                            utfX++;
-                            break;
-                        default:
-                            break;
-                    }
-#pragma warning restore 162
-                    #endregion
-                }
-            }
-        }
-    } // end class Guesser
-    
-#endif // !BYTEMODE
-#endregion
 #endif // !NOFILES

 // End of code copied from embedded resource
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
@@ -0,0 +1,11 @@
+namespace bts.BlueOrb {
+   using BCG;
+
+   [DataStreamUserRespresentation("AddColumnsStream")]
+   public class AddColumnsStream: ViewStream {
+      public AddColumnsStream(ViewStream parent_str, string add_col_expr) {
+         ViewStream rs = new BCG.AddColumnsStream(parent_str, add_col_expr);
+         mySetRealSource(rs);
+      }
+   }
+}
@@ -0,0 +1,49 @@
+using System;
+
+namespace BCG {
+   [DataStreamUserRespresentation("CountStream")]
+   public class CountStream : ViewStream {
+      private DataPacket myLastFiredDataPacket;
+      private IBlueTableSchema mySchema = new BlueTableSchema("count",
+         new ColumnInfo("id", 0, typeof(int)),
+         new ColumnInfo("count", 1, typeof(int)));
+      private int myId = 0;
+      private ViewStream myVS;
+
+      public CountStream(ViewStream vs) {
+         myVS = vs;
+      }
+
+      public CountStream(string tableName)
+         : this(new TableStream(tableName)) { }
+
+      protected override void myOnFirstSubscriber() {
+         myVS.onChange += new ChangeDelegate(myHandleChanges);
+      }
+      protected override void myOnLastSubscriber() {
+         myVS.onChange -= new ChangeDelegate(myHandleChanges);
+      }
+
+
+      private void myHandleChanges(object newValue) {
+         myFireEvent(
+            myLastFiredDataPacket =
+               myLastFiredDataPacket == null ?
+                  new DataPacket(myGetRows(newValue, ++myId), myGetRows(newValue, myId),
+                  new BlueTable(mySchema))
+                  :
+                  new DataPacket(myGetRows(newValue, ++myId), myGetRows(newValue, myId),
+                  myLastFiredDataPacket.newRows)
+            );
+      }
+
+      private IBlueRowCollection myGetRows(object dp, int id) {
+         BlueTable retVal = new BlueTable(mySchema);
+         retVal.addRow
+            (new BlueRow(mySchema, id, (dp as DataPacket).newRows.Count));
+         return retVal;
+      }
+
+
+   }
+}
@@ -0,0 +1,38 @@
+namespace bts.BlueOrb {
+   using bts;
+
+   using BCG;
+
+   using System;
+   [DataStreamUserRespresentation("DateTimeExpanderStream")]
+   public class DateTimeExpanstionStream : ViewStream {
+      public DateTimeExpanstionStream(ViewStream parent_stream, string inp_col) {
+         Func<IBlueTableSchema, IBlueTableSchema> get_schema = (s) => {
+            IBlueTableSchema rv = s.add_column(System.TypeCode.DateTime, $"{inp_col}_date");
+            rv = rv.add_column(System.TypeCode.String, $"{inp_col}_day_of_week");
+            rv = rv.add_column(System.TypeCode.Int32, $"{inp_col}_day_of_month");
+            rv = rv.add_column(System.TypeCode.Int32, $"{inp_col}_month");
+            rv = rv.add_column(System.TypeCode.Int32, $"{inp_col}_hour");
+            rv = rv.add_column(System.TypeCode.Int32, $"{inp_col}_minute");
+            rv = rv.add_column(System.TypeCode.Int32, $"{inp_col}_seconds_of_day");
+            return rv;
+         };
+         ViewStream rs = new MapStream(parent_stream,
+         s => get_schema(s),
+         r => {
+            DateTime dt = r.get_datetime(inp_col);
+            IBlueTableSchema s = get_schema(r.schema);
+            MutableBlueRow rv = new MutableBlueRow(s, r);
+            rv.setValue($"{inp_col}_date", dt.Date);
+            rv.setValue($"{inp_col}_day_of_week", dt.DayOfWeek.ToString());
+            rv.setValue($"{inp_col}_day_of_month", dt.Day);
+            rv.setValue($"{inp_col}_month", dt.Date.Month);
+            rv.setValue($"{inp_col}_hour", dt.Hour);
+            rv.setValue($"{inp_col}_minute", dt.Minute);
+            rv.setValue($"{inp_col}_seconds_of_day", (dt - dt.Date).TotalSeconds);
+            return rv;
+         });
+         mySetRealSource(rs);
+      }
+   }
+}
@@ -0,0 +1,156 @@
+namespace bts.BlueOrb {
+   using BCG;
+   using System;
+   using System.Text.RegularExpressions;
+
+   [DataStreamUserRespresentation("FilterStream")]
+   public class FilterStream : ViewStream {
+      public class RegExpFilter : IStreamFilter {
+         private Regex[] myRegExps;
+         private string[] myCols;
+
+         public RegExpFilter(string col, string regExp)
+            : this(new string[] { col }, new string[] { regExp }) { }
+
+         public RegExpFilter(string[] cols, string[] regExps) {
+            myCols = cols;
+            myRegExps = new Regex[regExps.Length];
+            for (int i = 0; i < regExps.Length; i++)
+               myRegExps[i] = new Regex(regExps[i]);
+         }
+
+         #region IStreamFilter Members
+         public bool filter(IBlueRow dr) {
+            bool rv = true;
+            for (int i = 0; i < myCols.Length; i++) {
+               rv &= myRegExps[i].IsMatch(dr[myCols[i]] is DBNull ? "" : dr[myCols[i]].ToString());
+               if (!rv)
+                  return rv;
+            }
+            return rv;
+         }
+         #endregion
+      }
+      private BlueTable myLastFiredRows;
+      private IBlueRowCollection myLastReceivedRows;
+      private IStreamFilter myFilter;
+      private ViewStream myParentStream;
+      private string myFilterString;
+      private bool myUseNewFilter = false;// Configuration.get<DataStreamConfig>().UseNewFilter;
+
+      #region constructors
+      public delegate bool OnFilter(IBlueRow r);
+      private class OnFilterWrapper : IStreamFilter {
+         public OnFilterWrapper(OnFilter f) { this.f = f; }
+
+         public bool filter(IBlueRow dr) { return f(dr); }
+
+         private OnFilter f;
+      }
+      public FilterStream(ViewStream vs, OnFilter f)
+         : this(vs, new OnFilterWrapper(f)) { }
+
+
+      public FilterStream(ViewStream vs, IStreamFilter filter) {
+         {
+            myParentStream = vs;
+            myFilter = filter;
+            myFilterString = filter.ToString();
+            if (filter is IDynamicStreamFilter)
+               (filter as IDynamicStreamFilter).onFilterChange += new FilterChangeDelegate(myHandleFilterChange);
+         }
+      }
+
+      public FilterStream(ViewStream vs, string filterExpression)
+         : this(vs, new BooleanExpressionFilter(filterExpression)) {
+         myFilterString = filterExpression;
+      }
+
+      public FilterStream(ViewStream vs, string col, string regExp)
+         : this(vs, new RegExpFilter(col, regExp)) {
+         myFilterString = col + " , " + regExp;
+      }
+
+      public FilterStream(ViewStream vs)
+         : this(vs, new BinaryFilter(true)) {
+         myFilterString = true.ToString();
+      }
+      #endregion
+
+      #region overridden methods
+      protected override void myOnFirstSubscriber() { myParentStream.onChange += new ChangeDelegate(myHandleCallbacks); }
+
+      protected override void myOnLastSubscriber() {
+         myLastFiredRows = null;
+         myParentStream.onChange -= new ChangeDelegate(myHandleCallbacks);
+      }
+
+      protected override void myFireEvent(object o) {
+         DataPacket dp = o as DataPacket;
+         if (myLastValue == null || dp.addedRows.Count + dp.deletedRows.Count > 0)
+            base.myFireEvent(o);
+      }
+      #endregion
+
+      private void myHandleCallbacks(object newValue) {
+         DataPacket retVal;
+         DataPacket arrivedPacket = newValue as DataPacket;
+         myLastReceivedRows = arrivedPacket.newRows;
+         if (myLastFiredRows != null) {
+            retVal = new DataPacket(myLastFiredRows, new BlueTable(myLastFiredRows.schema),
+               new BlueTable(myLastFiredRows.schema));
+            foreach (IBlueRow r in arrivedPacket.deletedRows)
+               if (myLastFiredRows.containsID((int)r["id"])) {
+                  myLastFiredRows.deleteRow(r);
+                  (retVal.deletedRows as BlueTable).addRow(r);
+               }
+            foreach (IBlueRow r in arrivedPacket.addedRows)
+               if (myFilter.filter(r)) {
+                  myLastFiredRows.addRow(r);
+                  (retVal.addedRows as BlueTable).addRow(r);
+               }
+         } else {
+            myLastFiredRows = new BlueTable(arrivedPacket.schema);
+            retVal = new DataPacket(myLastFiredRows, myLastFiredRows, new BlueTable(myLastFiredRows.schema));
+            foreach (IBlueRow r in arrivedPacket.newRows)
+               if (myFilter.filter(r))
+                  myLastFiredRows.addRow(r);
+         }
+         myFireEvent(retVal);
+      }
+
+      public IStreamFilter filter {
+         set {
+            {
+               myFilter = value;
+               if (numberOfSubscribers > 0) {
+                  if (myLastReceivedRows != null) {
+                     BlueTable nRows = new BlueTable(myLastReceivedRows.schema);
+                     foreach (IBlueRow r in myLastReceivedRows)
+                        if (myFilter.filter(r))
+                           nRows.addRow(r);
+                     IBlueRowCollection dRows = new BlueTable(nRows.schema),
+                        aRows = new BlueTable(nRows.schema);
+                     BlueDataUtility.computeDifferences(nRows, myLastFiredRows, out dRows, out aRows);
+                     myLastFiredRows = nRows;
+                     myFireEvent(new DataPacket(nRows, aRows, dRows));
+                  }
+               }
+            }
+         }
+         get {            
+               return myFilter;
+         }
+      }
+
+      //public string filterString { set { filter = new BooleanExpressionFilter(value); } }
+
+      public override string ToString() {
+         return GetType().ToString() + " " + myFilterString;
+      }
+
+      private void myHandleFilterChange() {
+         filter = myFilter;
+      }
+   }
+}
@@ -0,0 +1,121 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text.Json;
+
+using bts;
+//using bts.SilverPine;
+using BCG;
+
+namespace bts.BlueOrb {
+   [DataStreamUserRespresentation("GroupByStream")]
+   public class GroupByStream : ViewStream {
+
+      public interface INonIncGroupByEvaluator {
+         // grouped_rows
+         IBlueRowCollection evaluate(IDictionary<int, List<IBlueRow>> grouped_rows);
+         string[] get_group_by_cols();
+      }
+
+      private class DelNonIncGroupByEvaluator : INonIncGroupByEvaluator {
+         Func<string[]> _groupby_cols_func;
+         Func<List<IBlueRow>, List<IBlueRow>> _evaluate_func;
+         public DelNonIncGroupByEvaluator(Func<string[]> groupby_cols_func,
+                                          Func<List<IBlueRow>, List<IBlueRow>> evaluate_func) {
+            _groupby_cols_func = groupby_cols_func;
+            _evaluate_func = evaluate_func;
+         }
+         public IBlueRowCollection evaluate(IDictionary<int, List<IBlueRow>> grouped_rows) {
+            BlueTable rv = null;
+            foreach (var kv in grouped_rows) {
+               List<IBlueRow> g_rows = kv.Value;
+               List<IBlueRow> out_rows = _evaluate_func.Invoke(g_rows);
+               if (out_rows != null && out_rows.Count > 0) {
+                  rv = rv ?? new BlueTable(out_rows.ElementAt(0).schema);
+               }
+               rv.addRows(out_rows);
+            }
+            return rv;
+         }
+         public string[] get_group_by_cols() {
+            return _groupby_cols_func();
+         }
+
+      }
+      private ViewStream _main_stream;
+      private INonIncGroupByEvaluator _groupby_func;
+      private BlueRowHasher _row_hasher;
+      private string[] _groupby_cols;
+      private Stopwatch _timer = new();
+      private int _n_total_fires = 0, _n_expensive_fires = 0;
+
+      public GroupByStream(ViewStream main_stream, INonIncGroupByEvaluator groupby_func) {
+         _main_stream = main_stream;
+         _groupby_func = groupby_func;
+         _groupby_cols = _groupby_func.get_group_by_cols();
+         _row_hasher = new BlueRowHasher(_groupby_cols == null ? 0 : _groupby_cols.Length);
+      }
+
+      public GroupByStream(ViewStream main_stream, Func<string[]> groupby_cols_func,
+                                 Func<List<IBlueRow>, List<IBlueRow>> evaluate_func)
+                                 : this(main_stream, new DelNonIncGroupByEvaluator(groupby_cols_func, evaluate_func)) { }
+
+      public GroupByStream(ViewStream parent_str, string groupby_col, string standard_group_by_text)
+      : this(parent_str, groupby_col, standard_group_by_text, String.Empty) { }
+
+      // this is the main constructor that does everything
+      public GroupByStream(ViewStream parent_str, string groupby_col, string standard_group_by_ops, string optional_sort_col) {
+         MultiRowOpHelper std_group_by = MultiRowOpHelper.parse_ops(standard_group_by_ops);
+         Func<string[]> groupby_cols_func = () => {
+            return String.IsNullOrEmpty(groupby_col) ? null : new string[] { groupby_col };
+         };
+         Func<List<IBlueRow>, List<IBlueRow>> evaluate_func = (group_rows) => {
+            if (!String.IsNullOrEmpty(optional_sort_col))
+               group_rows.Sort((r1, r2) => BlueDataUtility.compare_rows(r2, r1, optional_sort_col));
+            // this si where the group by aggregation happens
+            IBlueRow rv = MultiRowOpHelper.group_by_compute(group_rows, std_group_by);
+            return new IBlueRow[] { rv }.ToList();
+         };
+         ViewStream rs = new GroupByStream(parent_str, groupby_cols_func, evaluate_func);
+         mySetRealSource(rs);
+      }
+      public GroupByStream(ViewStream parent_str, string standard_group_by_text) :
+      this(parent_str, String.Empty, standard_group_by_text) {
+      }
+
+
+      protected override void myOnFirstSubscriber() { _main_stream.onChange += _main_stream_onchange; }
+
+      protected override void myOnLastSubscriber() { _main_stream.onChange -= _main_stream_onchange; }
+
+      private void _main_stream_onchange(object nv) {
+         DataPacket dp = nv as DataPacket;
+         ///grouping together
+         _timer.Restart();
+         IDictionary<int, List<IBlueRow>> grouped_rows = (_groupby_cols == null || _groupby_cols.Length == 0) ?
+         new Dictionary<int, List<IBlueRow>>() { { 0, dp.newRows.to_list() } } :
+         BlueDataUtility.group_together(dp.newRows, _groupby_cols, ref _row_hasher);
+         _timer.Stop();
+         var groupElapsedMs = _timer.ElapsedMilliseconds;
+         if (groupElapsedMs >= 50) {
+            Log.DataFlow.info($"Time to group {dp.newRows.Count} rows into {grouped_rows.Count} groups: {_timer.ElapsedMilliseconds}ms");
+         }
+         // Log.log(bts.Log.Level.Info, bts.log.Subsystem.gen, String.Format("Time to group {0} rows into {1} groups = {2}", dp.newRows.Count, grouped_rows.Count, _timer.lastIntervalTime));
+         /// reducing
+         _timer.Restart();
+         IBlueRowCollection total_state = _groupby_func.evaluate(grouped_rows);
+         _timer.Stop();
+         var applyElapsedMs = _timer.ElapsedMilliseconds;
+         _n_total_fires++;
+         if (applyElapsedMs >= 50) {
+            _n_expensive_fires++;
+            Log.DataFlow.info(
+               $"Time to evaluate {grouped_rows.Count} groups {_timer.ElapsedMilliseconds}ms, ratio {_n_expensive_fires}/{_n_total_fires}");
+         }
+         // TODO,
+         if (total_state != null)
+            myFireEvent(new DataPacket(total_state, total_state, myLastValue == null ? new BlueTable(total_state.schema) : (myLastValue as DataPacket).newRows));
+      }
+   }
+}
@@ -0,0 +1,187 @@
+namespace bts.BlueOrb {
+   using BCG;
+   using RowHash = System.Int32;
+   using System;
+   using System.Collections.Generic;
+   using System.Linq;
+   using System.Text;
+   using System.Threading.Tasks;
+   using System.Collections;
+   using System.Data.Entity.Core.Mapping;
+
+   [DataStreamUserRespresentation("JoinStream")]
+   public class SimpleJoinStream : ViewStream {
+      public class JoinBookkeepingData {
+         // initialized in cons
+         private readonly List<string> _join_col_names;
+         private readonly bool _is_left;
+         private readonly BlueRowHasher _hasher;
+         // initialized on first udpate         
+         private IBlueTableSchema _schema;
+         private int[] _join_cols;
+         private IDictionary<RowHash, List<IBlueRow>> _hash_row_map = new Dictionary<RowHash, List<IBlueRow>>();
+         
+         public JoinBookkeepingData(ViewStream vs, List<string> join_cols, bool is_left, BlueRowHasher row_hasher) {
+            _join_col_names = join_cols.Where (c => !String.IsNullOrEmpty(c)).ToList ();
+            _is_left = is_left;
+            _hasher = row_hasher;
+         }
+
+         public IBlueTableSchema schema => _schema;
+
+         public IDictionary<RowHash, List<IBlueRow>> rows => _hash_row_map;
+
+         public List<IBlueRow> get_matching_rows (int hash) {
+            List<IBlueRow> rv = null;
+            _hash_row_map.TryGetValue(hash, out rv);
+            return rv;
+         }
+
+         private RowHash _get_hash(IBlueRow r) {
+            if (_join_cols == null || _join_cols.Length == 0) { 
+               return 0;
+            }
+            return _hasher.get_hash(r, _join_cols);
+         }
+
+         public void update_data(DataPacket dp) {
+            if (!ready) {               
+               _schema = dp.newRows.schema;
+               _join_cols = _join_col_names.Count == 0 ? new int[] { }: _join_col_names.Select(n => dp.schema[n].colNo).ToArray();
+            }
+            _hash_row_map.Clear();
+            foreach (IBlueRow r in dp.newRows) {
+               int hash = _get_hash(r);
+               List<IBlueRow> hash_rows = null;
+               if (!_hash_row_map.TryGetValue(hash, out hash_rows)) {
+                  hash_rows = new List<IBlueRow>();
+                  _hash_row_map.Add(hash, hash_rows);
+               }
+               hash_rows.Add(r);
+            }
+         }
+
+         public bool ready {
+            get {
+               return _schema != null;
+            }
+         }
+
+      }
+
+      private ViewStream _ls, _rs;
+      private JoinBookkeepingData _ldata, _rdata;
+      private ViewStreamDatabase _vsd;
+      private IBlueTableSchema _schema = null;
+
+      public SimpleJoinStream(ViewStream ls, string ljc, ViewStream rs, string rjc) :
+         this(ViewStreamDatabase.instance, ls, ljc, rs, rjc) { }
+
+      public SimpleJoinStream(ViewStreamDatabase vsd, ViewStream ls, string ljc, ViewStream rs, string rjc) {
+         _ls = ls;
+         _rs = rs;
+         List<string> lj_col_list = ljc.Split(',').Where(x => !String.IsNullOrEmpty(x)).ToList();
+         List<string> rj_col_list = rjc.Split(',').Where(x => !String.IsNullOrEmpty(x)).ToList();
+         Log.assert(lj_col_list.Count ==  rj_col_list.Count);
+         int n_cols = lj_col_list.Count;
+         BlueRowHasher hasher = new BlueRowHasher(n_cols);
+         _ldata = new JoinBookkeepingData(ls, lj_col_list, true, hasher);
+         _rdata = new JoinBookkeepingData(rs, rj_col_list, false, hasher);
+      }
+
+      protected override void myOnFirstSubscriber() {
+         _ls.onChange += _ls_onchange;
+         _rs.onChange += _rs_onchange;
+      }
+
+      private void _ls_onchange(object dp_obj) {
+         DataPacket dp = dp_obj as DataPacket;
+         _ldata.update_data(dp);
+         _form_and_fire();
+      }
+
+      private void _rs_onchange(object dp_obj) {
+         DataPacket dp = dp_obj as DataPacket ;
+         _rdata.update_data(dp);
+         _form_and_fire();
+      }
+
+      protected override void myOnLastSubscriber() {
+         _ls.onChange -= _ls_onchange;
+         _rs.onChange -= _rs_onchange;
+      }
+
+      private void _build_schema() {
+         if (_schema != null)
+            return;
+         List<ColumnInfo> cis = new List<ColumnInfo>();
+         cis.Add(new ColumnInfo("id", 0, TypeCode.Int32));
+         foreach (ColumnInfo ci in _ldata.schema.columnInfo) {
+            string col_name = _rdata.schema.contains_column(ci.colName) ? $"left_{ci.colName}" : ci.colName;
+            cis.Add(new ColumnInfo(col_name, cis.Count, ci.colType));
+         }
+         foreach (ColumnInfo ci in _rdata.schema.columnInfo) {
+            string col_name = _ldata.schema.contains_column(ci.colName) ? $"right_{ci.colName}" : ci.colName;
+            cis.Add(new ColumnInfo(col_name, cis.Count, ci.colType));
+         }
+         _schema = new BlueTableSchema($"{_ldata.schema.tableName}_join_{_rdata.schema.tableName}", cis.ToArray());
+      }
+
+      private void _form_and_fire() {
+         if (!_ldata.ready||!_rdata.ready)
+            return;
+         _build_schema();
+         List<object[]> res_rows = new List<object[]>();
+         
+         Action<object[], IBlueRow, bool> copy_row = (rval, r, is_left) => {
+            int offset = 1;
+            JoinBookkeepingData sdata = _ldata;
+            if (is_left) {
+               offset = 1;
+               sdata = _ldata;
+            } else {
+               sdata = _rdata;
+               offset = 1 + _ldata.schema.columnInfo.Length;
+            }
+            for (int i = 0; i < sdata.schema.columnInfo.Length; i++) {
+               rval[offset + i] = r[i];
+            }
+         };
+         Func<int, IBlueRow, object[]> build_row_array = (id, l_row) => {
+            object[] rv = new object[_schema.columnNames.Length];            
+            for (int i = 0; i < _schema.columnNames.Length; i++) {
+               rv[i] = DBNull.Value;
+            }
+            rv[0] = id;
+            copy_row(rv, l_row, true);
+            return rv;
+         };
+         // this is where the join happens
+         foreach (var kv in _ldata.rows) {
+            RowHash hash = kv.Key;
+            List<IBlueRow> l_rows = kv.Value;
+            List<IBlueRow> r_rows = _rdata.get_matching_rows(hash);
+
+            foreach (IBlueRow lr in l_rows) {                              
+               if (r_rows != null) {
+                  foreach (IBlueRow r in r_rows) {
+                     object[] rowvals = build_row_array(res_rows.Count, lr);
+                     copy_row(rowvals, r, false);
+                     res_rows.Add(rowvals);
+                  }
+               } else {
+                  object[] rowvals = build_row_array(res_rows.Count, lr);
+                  res_rows.Add(rowvals);
+               }
+            }
+         }
+         BlueTable rv = new BlueTable(_schema);
+         foreach (object[] rval in res_rows) {
+            rv.addRow(new BlueRow(_schema, rval));
+         }
+         var dp = BlueDataUtility.build_dp(rv, myLastValue as DataPacket);
+         myFireEvent(dp);
+      }
+
+   }
+}
@@ -0,0 +1,28 @@
+//namespace bts.Blueorb {
+//   using BCG;
+
+//   public class JsonSaverStream : ViewStream {
+//      private ViewStream _stream;
+//      private string _file_name;
+//      public JsonSaverStream(ViewStream vs, string file_name) {
+//         _stream = vs;
+//         _file_name = file_name;
+//      }
+
+//      protected override void myOnFirstSubscriber() {
+//         _stream.onChange += _on_data;
+//      }
+
+//      private void _on_data(object dp_obj) {
+//         if (dp_obj == null) {
+//            return;
+//         }
+//         DataPacket dp = dp_obj as DataPacket;
+//         dp.newRows.write_to_json_file(dp.newRows, _file_name);
+//      }
+
+//      protected override void myOnLastSubscriber() {
+//         _stream.onChange -= _on_data;
+//      }
+//   }
+//}
@@ -0,0 +1,91 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+using Amazon.Runtime.Internal.Util;
+
+using BCG;
+using BCG.Utilities;
+
+using bts;
+
+namespace bts.BlueOrb{
+   public class LiteralStream : ViewStream {
+
+      public static List<Tuple<ColumnInfo, object>> parse_columns(string key_value_pairs) {
+         List<Tuple<ColumnInfo, object>> rv = new List<Tuple<ColumnInfo, object>>();
+         string[] pairs = key_value_pairs.Split(' ');
+         foreach (string p in pairs) {
+            string[] kvp = p.Split(':');
+            string col_name = kvp[0];
+            string val = kvp[1];
+            var tup = BlueDataUtility.guess_type(val);
+            var ci = new ColumnInfo(col_name, rv.Count, tup.Item1);
+            rv.Add(Tuple.Create(ci, tup.Item2));
+         }
+         return rv;
+      }
+
+      //literal("table1", "x:123, y:1.001, z:abc;x:123, y:1.001, z:abc")
+      // col_name: col_value ... ; col_name: col_value
+      public LiteralStream(string table_name, string rows) {
+         Func<string, int, IBlueRow> get_row = (json_row, id) => {
+            Dictionary<string, object> map = new Dictionary<string, object>();
+            string[] toks = json_row.Split(',', StringSplitOptions.TrimEntries);
+            //Logger.assert(col_vals.Length == 2);
+            foreach (string t in toks) {
+               var col_vals = t.Split(':', StringSplitOptions.TrimEntries);
+               string col = col_vals[0];
+               string val = col_vals[1];
+               map.Add(col, val);
+            }
+            map["id"] = id;
+            return new BlueRow(map);
+         };
+         string[] row_arr = rows.Split(';', StringSplitOptions.TrimEntries);
+         BlueTable table = null;
+         foreach (string json_string in row_arr) {
+            IBlueRow r = //BlueDataUtility.convert_json_to_row(json_string, table == null ? 0 : table.Count);
+            get_row(json_string, table == null ? 0 : table.Count);
+            table = table ?? new BlueTable(r.schema);
+            table.addRow(r);
+         }
+         ViewStream str = new BlueTableStream(table);
+         str = new SchemaGuesserStream(str);
+         mySetRealSource(str);
+      }
+
+      public LiteralStream(string tableName, string schema, string value) {
+         string[] columns = schema.Split(' ');
+
+
+         ColumnInfo[] ci = new ColumnInfo[columns.Length + 1];
+         ci[0] = new ColumnInfo("id", 0, typeof(int));
+         int n = 1;
+         foreach (string c in columns) {
+            string[] columnAndType = c.Split('/');
+            if (columnAndType.Length == 1)
+               ci[n] = new ColumnInfo(c, n, typeof(double));
+            else
+               ci[n] = new ColumnInfo(columnAndType[0], n, Type.GetType("System." + columnAndType[1], true));
+            n++;
+         }
+
+
+         BlueTable t = new BlueTable(new BlueTableSchema(tableName, ci));
+         string[] rows = value.Split(';');
+         n = 0;
+         foreach (string r in rows)
+            try {
+               if (r == string.Empty)
+                  continue;
+               t.addRow(
+                  BlueDataUtility.createRowFromCSVFileRow(r, t.schema, ++n));
+            } catch (Exception e) {
+               throw (new Exception("Error occured at line: " + n.ToString() + " " + e.Message));
+            }
+
+         mySetRealSource(new BlueRowCollectionStaticStream(t));
+      }
+   }
+}
@@ -0,0 +1,89 @@
+using System;
+
+using BCG.Utilities.General;
+using BCG;
+using bts;
+
+namespace bts.BlueOrb {
+   [DataStreamUserRespresentation("MillisecondStream")]
+   public class MillisecondStream : ViewStream, IWorker {
+      private DateTime _last_fire_time = DateTime.MinValue;
+      private readonly TimeSpan _period;
+      private readonly int _size;
+      private readonly ViewStreamDatabase _vsd;
+      private IBlueTableSchema _schema;
+      private bts.CircularBufferTable _table;
+
+      public MillisecondStream(int interval_msecs, int size)
+      : this(ViewStreamDatabase.instance, interval_msecs, size) {
+      }
+
+      public MillisecondStream(ViewStreamDatabase vsd, int interval_msecs, int size) {
+         _vsd = vsd;
+         _period = TimeSpan.FromMilliseconds(interval_msecs);
+         _size = size;
+         _schema = BlueDataUtility.form_schema("Milliseconds",
+               Tuple.Create("id", TypeCode.Int32),
+               Tuple.Create("time", TypeCode.DateTime),
+               Tuple.Create("display_time", TypeCode.String));
+         _table = new CircularBufferTable(_schema, _size);
+      }
+
+      protected override void myOnFirstSubscriber() {
+         _vsd.addWorker(this);
+      }
+
+      protected override void myOnLastSubscriber() {
+         _vsd.removeWorker(this);
+      }
+
+      private int _id = 0;
+      public void doWork() {
+         if (DateTime.Now - _last_fire_time >= _period) {
+            _last_fire_time = DateTime.Now;
+            IBlueRow nr = new BlueRow(_schema, _id++, _last_fire_time,
+            _last_fire_time.ToString("yyyy-MM-dd HH:mm:ss.fff"));
+            _table.add_row(nr);
+            var dp = BlueDataUtility.build_dp_inc(_table, myLastValue as DataPacket);
+            myFireEvent(dp);
+         }
+      }
+   }
+   internal class MSecondStream : TimeUnitStream {
+      public MSecondStream(int intervalInms, int size)
+         : base(DateTime.Now, new TimeSpan(0, 0, 0, 0, intervalInms), size, ViewStreamDatabase.instance) { }
+
+      protected override DateTime myRoundTime(DateTime dt) { return dt; }
+   }
+
+   internal class DisplayableMillisecondStream : ViewStream, IStreamMapper {
+      private IBlueTableSchema mySchema = new BlueTableSchema("ms",
+                                                               new ColumnInfo("id", 0, typeof(int)),
+                                                               new ColumnInfo("time", 1, typeof(string)));
+      public DisplayableMillisecondStream(int intervalInMs, int sz) {
+         mySetRealSource(new MapStream(new MSecondStream(intervalInMs, sz), this));
+      }
+      #region IStreamMapper Members
+
+      public IBlueTableSchema getOutputSchema(IBlueTableSchema inputSchema) {
+         return mySchema;
+      }
+
+      #endregion
+
+      #region IDynamicStreamMapper Members
+
+      public IBlueRow map(IBlueRow row) {
+         DateTime time = row.get_datetime("time");
+         var time_txt = time.ToString("yyyy-MM-dd HH:mm:ss.fff");
+         return new BlueRow(mySchema, row["id"], time_txt);
+      }
+
+      #endregion
+
+      private string myToString(DateTime dt) {
+         string sep = ":";
+         return dt.Hour + sep + dt.Minute + sep + dt.Second + sep + dt.Millisecond;
+      }
+   }
+}
@@ -0,0 +1,161 @@
+namespace bts.BlueOrb {
+   using BCG;
+
+   using System;
+   using System.Collections.Generic;
+   using System.Linq;
+   //using MathNet.Numerics.Statistics;
+
+
+   public enum MultiRowOp {
+      Mean,
+      Median,
+      Mode,
+      Range,
+      StdDev,
+      Max,
+      Min,
+      First,
+      Last,
+      Sum,
+      EdgeDiff,
+      EdgeDiffPercentage,
+   }
+   public class MultiRowOpHelper {
+      // input + op
+      public readonly List<Tuple<string, MultiRowOp>> operations;
+
+      public static MultiRowOpHelper parse_ops(string text) {
+         // text is inp_col: op, inp_col: op, inp_col:op
+         // ex: "open:First, close:Last, high:Max, low:Min, volume:Sum")
+         List<Tuple<string, MultiRowOp>> rv = new List<Tuple<string, MultiRowOp>>();
+         string[] calcs = text.Split(',');
+         foreach (string c in calcs) {
+            string[] toks = c.Split(':');
+            string inp_col = toks[0].Trim();
+            string op_txt = toks[1].Trim();
+            MultiRowOp op = Enum.Parse<MultiRowOp>(op_txt, true);
+            rv.Add(Tuple.Create(inp_col, op));
+         }
+         return new MultiRowOpHelper(rv);
+      }
+
+      public MultiRowOpHelper(List<Tuple<string, MultiRowOp>> operations_) {
+         operations = operations_;
+      }
+
+      // aggregates multiple rows into one - ie does group_by compute
+      public static IBlueRow group_by_compute(List<IBlueRow> rows, MultiRowOpHelper parameters) {
+         if (rows.Count() == 0) {
+            return null;
+         }
+
+         IBlueRow ir = rows.ElementAt(0);
+         IBlueTableSchema in_schema = ir.schema;
+         IBlueTableSchema out_schema = in_schema;
+         IDictionary<string, Tuple<string, MultiRowOp>> out_col_map =
+            new Dictionary<string, Tuple<string, MultiRowOp>>();
+         foreach (var t in parameters.operations) {
+            string out_col_name = $"{t.Item1}_{t.Item2}".ToLower();
+            out_schema = out_schema.add_column(TypeCode.Double, out_col_name);
+            out_col_map[out_col_name] = t;
+         }
+         MutableBlueRow or = new MutableBlueRow(out_schema, ir);
+         foreach (var kv in out_col_map) {
+            string out_col_name = kv.Key;
+            string in_col_name = kv.Value.Item1;
+            MultiRowOp op = kv.Value.Item2;
+            IEnumerable<double> col_vals = BlueDataUtility.get_colvalues<double>(rows, in_col_name);
+            double comp_res = compute_op(col_vals, op);
+            or.setValue(out_col_name, comp_res);
+         }
+         return or;
+      }
+
+      // aggregates multiple rows into one, used by MultiRowRollingMathStream
+      public static IBlueRow group_by_compute(List<IBlueRow> rows, int start_idx, int n_rows, MultiRowOpHelper parameters) {
+         if (rows.Count() == 0) {
+            return null;
+         }
+         IBlueRow ir = rows.ElementAt(start_idx);
+         IBlueTableSchema in_schema = ir.schema;
+         IBlueTableSchema out_schema = in_schema;
+         // out_col vs inp_cal + type
+         IDictionary<string, Tuple<string, MultiRowOp>> out_col_map =
+            new Dictionary<string, Tuple<string, MultiRowOp>>();
+         foreach (var t in parameters.operations) {
+            string out_col_name = $"{t.Item1}_{t.Item2}".ToLower();
+            out_schema = out_schema.add_column(TypeCode.Double, out_col_name);
+            out_col_map[out_col_name] = t;
+         }
+         MutableBlueRow or = new MutableBlueRow(out_schema, ir);
+         foreach (var kv in out_col_map) {
+            string out_col_name = kv.Key;
+            string in_col_name = kv.Value.Item1;
+            MultiRowOp op = kv.Value.Item2;
+            IEnumerable<double> col_vals = BlueDataUtility.get_colvalues<double>(rows, start_idx, n_rows, in_col_name);
+            double comp_res = compute_op(col_vals, op);
+            or.setValue(out_col_name, comp_res);
+            or.setValue("id", ir["id"]);
+         }
+         return or;
+      }
+
+      // rolling_rows are the rolling window of rows. the 0th row is the one thats gettin
+      // calculated. rows 1 - n-1 are its window rows. the schema is based on the operations.
+
+      public IBlueRow rolling_calc(List<IBlueRow> rolling_rows) {
+         if (rolling_rows.Count() == 0) {
+            return null;
+         }
+         IBlueRow ir = rolling_rows.ElementAt(0);
+         IBlueTableSchema in_schema = ir.schema;
+         IBlueTableSchema out_schema = in_schema;
+         IDictionary<string, Tuple<string, MultiRowOp>> out_col_map =
+            new Dictionary<string, Tuple<string, MultiRowOp>>();
+         foreach (var t in operations) {
+            string out_col_name = $"{t.Item1}_{t.Item2}".ToLower();
+            out_schema = out_schema.add_column(TypeCode.Double, out_col_name);
+            out_col_map[out_col_name] = t;
+         }
+         MutableBlueRow or = new MutableBlueRow(out_schema, ir);
+         foreach (var kv in out_col_map) {
+            string out_col_name = kv.Key;
+            string in_col_name = kv.Value.Item1;
+            MultiRowOp op = kv.Value.Item2;
+            IEnumerable<double> col_vals = BlueDataUtility.get_colvalues<double>(rolling_rows, in_col_name);
+            double comp_res = compute_op(col_vals, op);
+            or.setValue(out_col_name, comp_res);
+         }
+         return or;
+      }
+
+      public static double compute_op(IEnumerable<double> col_vals, MultiRowOp op) {
+         switch (op) {
+            case MultiRowOp.Max:
+               return col_vals.Max<double>();
+            case MultiRowOp.Min:
+               return col_vals.Min<double>();
+            case MultiRowOp.Mean:
+               return MathNet.Numerics.Statistics.Statistics.Mean(col_vals);
+            case MultiRowOp.Sum:
+               return col_vals.Sum();
+            case MultiRowOp.Median:
+               return MathNet.Numerics.Statistics.Statistics.Median(col_vals);
+            //case MultiRowOp.Mode:
+            //   return MathNet.Numerics.Statistics.Statistics.(col_vals);
+            case MultiRowOp.First:
+               return col_vals.First();
+            case MultiRowOp.Last:
+               return col_vals.Last();
+            case MultiRowOp.StdDev:
+               return MathNet.Numerics.Statistics.Statistics.StandardDeviation(col_vals);
+            default:
+               // TODO
+               Log.assert(false);
+               return Double.NaN;
+         }
+      }
+
+   }
+}
@@ -0,0 +1,40 @@
+namespace bts.BlueOrb {
+   using BCG;
+
+   using System.Collections.Generic;
+   using System.Net;
+
+   [DataStreamUserRespresentation("MultiRowRollingMathStream")]
+   public class MultiRowRollingMathStream : ViewStream {
+      private ViewStream _sorted_parent_str;
+      private MultiRowOpHelper _op;
+      private int _rolling_window_sz;
+      public MultiRowRollingMathStream(ViewStream parent_str, string op_txt, string sort_exp, int rolling_window_sz) {
+         _sorted_parent_str = new SortStream(parent_str, sort_exp);
+         _op = MultiRowOpHelper.parse_ops(op_txt);
+         _rolling_window_sz = rolling_window_sz;
+      }
+
+      protected override void myOnFirstSubscriber() {
+         _sorted_parent_str.onChange += _parent_str_onchange;
+      }      
+
+      protected override void myOnLastSubscriber() {
+         _sorted_parent_str.onChange -= _parent_str_onchange;
+      }
+
+      private void _parent_str_onchange(object dp_obj) {
+         DataPacket dp = dp_obj as DataPacket;
+         var rows = dp.newRows.to_list();
+         BlueTable out_table = null;
+         for (int i = 0; i < rows.Count; i++) {
+            var out_r = MultiRowOpHelper.group_by_compute(rows, i, _rolling_window_sz, _op);
+            if (out_table == null)
+               out_table = new BlueTable(out_r.schema);
+            out_table.addRow(out_r);
+         }            
+         var dp_out = BlueDataUtility.build_dp_inc(out_table, myLastValue as DataPacket, true);
+         myFireEvent(dp_out);
+      }
+   }
+}
@@ -0,0 +1,188 @@
+namespace bts.BlueOrb {
+   using BCG;
+   using System;
+   using System.Collections;
+   using System.Collections.Generic;
+   using System.Linq;
+
+   #region mappings
+   internal class ProjectData {
+      // schema from the base stream
+      public readonly IBlueTableSchema in_schema;
+      // this is the projected schema
+      public readonly IBlueTableSchema out_schema;
+      // projected cols to the input cols, for cols who's names are changed
+      public readonly IDictionary<string, string> mapped_to_orig_col_map = new Dictionary<string, string>();
+      public ProjectData(IBlueTableSchema in_schema_, IBlueTableSchema out_schema_,
+                  IDictionary<string, string> mapped_to_orig_col_map_) {
+         in_schema = in_schema_;
+         out_schema = out_schema_;
+         mapped_to_orig_col_map = mapped_to_orig_col_map_;
+      }
+   }
+   #endregion
+
+
+#region Row with mappings build in
+   internal class NewProjectRow : IBlueRow {
+      #region IBlueRow members
+      private ProjectData _project_data;
+      private IBlueRow _row;
+      public NewProjectRow(ProjectData project_data, IBlueRow row) {
+         _project_data = project_data;
+         _row = row;
+      }
+      public IBlueTableSchema schema { get { return _project_data.out_schema; } }
+      #endregion
+
+      #region ICollection members
+      public int Count { get { return schema.columnNames.Length; } }
+
+      public bool IsSynchronized { get { return false; } }
+
+      public object SyncRoot { get { return this; } }
+
+      public void CopyTo(Array array, int index) {
+         int i = index;
+         foreach (object o in this as IEnumerable)
+            array.SetValue(o, i++);
+      }
+      #endregion
+
+      #region IDictionary members
+      public bool IsFixedSize { get { return true; } }
+
+      public bool IsReadOnly { get { return true; } }
+
+      public object this[object key] {
+         get {
+            if (key is string)
+               return this[(string)key];
+            return this[(int)key];
+         }
+         set { throw new NotSupportedException("The IBlueRow is readonly"); }
+      }
+
+      public object this[int index] {
+         get {
+            return this[schema.columnInfo[index].colName];
+         }
+      }
+
+      public object this[string col_name] {
+         get {
+            string mapped_to_col = null;
+            if (_project_data.mapped_to_orig_col_map.TryGetValue(col_name, out mapped_to_col)) {
+               return _row[mapped_to_col];
+            }
+            return _row[col_name];
+         }
+      }
+
+      public ICollection Keys { get { return schema.columnNames; } }
+
+      public ICollection Values {
+         get {
+            object[] retVal = new object[schema.columnNames.Length];
+            CopyTo(retVal, 0);
+            return retVal;
+         }
+      }
+
+      public void Add(object key, object value) { throw new NotSupportedException("The IBlueRow is readonly"); }
+
+      public void Clear() { throw new NotSupportedException("The IBlueRow is readonly"); }
+
+      public bool Contains(object key) { return schema[(string)key] != null; }
+
+      /// <summary>
+      /// Note, the default enumerator is the IDictionary's enumerator, so if user needs to
+      /// iterate through the values, typecast this into an IEnumerable
+      /// </summary>
+      /// <returns></returns>
+      public IDictionaryEnumerator GetEnumerator() { return new BlueRowDictionaryEnumerator(this); }
+
+      IEnumerator IEnumerable.GetEnumerator() { return new BlueRowEnumerator(this); }
+
+      public void Remove(object key) { throw new NotSupportedException("The IBlueRow is readonly"); }
+      #endregion
+   }
+   #endregion
+
+   [DataStreamUserRespresentation("ProjectStream")]
+   public class NewProjectStream : ViewStream, IStreamMapper {
+
+      private ViewStream _stream;
+      private string _project_expression;
+      private ProjectData _project_data = null;
+      //public ProjectData 
+      public NewProjectStream(ViewStream vs, string project_expression) {
+         _stream = vs;
+         _project_expression = project_expression;
+         _stream = new MapStream(vs, this);
+         mySetRealSource(_stream);
+      }
+
+      public IBlueTableSchema getOutputSchema(IBlueTableSchema input_schema) {
+         _project_data = _create_project_data(input_schema, _project_expression);
+         return _project_data.out_schema;
+      }
+
+      public IBlueRow map(IBlueRow row) {
+         return new NewProjectRow(_project_data, row);
+      }
+
+      // this is where most of the logic is, in terms of translating cols
+      private static ProjectData _create_project_data(IBlueTableSchema input_schema,
+                                                      string project_expression) {
+         project_expression = project_expression.Trim();
+         string[] project_toks = project_expression.Split(' ', ',');
+         HashSet<string> removed_cols = new HashSet<string>();
+         Dictionary<string, string> orig_to_mapped = new Dictionary<string, string>();      
+         // by default every col will show up, so if we have the projection as (a:a1)
+         // it will convert a to a1, 
+         // modifications (6/30/2025):
+         // only the columns represented here, either mapped
+         // or not, will show
+         // examples: if a schema has cols a b c
+         // project(parent_str, "a:aa b") -> aa b
+         foreach (string o_p_tok in project_toks) {
+            string p_tok = o_p_tok.Trim();
+            if (p_tok.Contains(":")) {
+               // explicit mapping
+               string[] map_toks = p_tok.Split(":");
+               string orig_col = map_toks[0];
+               string mapped_col = map_toks[1];
+               orig_to_mapped.Add(orig_col, mapped_col);  
+            } else {
+               // this is a col_name explicitely stated
+               if (input_schema.columnNames.Contains(p_tok)) {
+                  string orig_col = p_tok;
+                  string mapped_col = orig_col;
+                  orig_to_mapped.Add(orig_col, mapped_col);
+               }
+            }
+         }
+
+         // make the new schema
+         List<ColumnInfo> new_cols = new List<ColumnInfo>();
+         foreach (ColumnInfo ci in input_schema.columnInfo) {
+            if (ci.colName == "id") {
+               ColumnInfo nc = new ColumnInfo(ci.colName, new_cols.Count, ci.colType);
+               new_cols.Add(nc);
+               continue;           
+            } else if (orig_to_mapped.ContainsKey(ci.colName)) {
+               string mapped_name = orig_to_mapped[ci.colName];
+               ColumnInfo nc = new ColumnInfo(mapped_name, new_cols.Count, ci.colType);
+               new_cols.Add(nc);
+            }
+         }
+         IBlueTableSchema new_schema = new BlueTableSchema(input_schema.tableName, new_cols.ToArray());
+         var mapped_to_orig_map = orig_to_mapped.ToDictionary(kv => kv.Value, kv => kv.Key);
+         return new ProjectData(input_schema, new_schema, mapped_to_orig_map);
+      }
+
+   
+
+   }
+}
@@ -0,0 +1,127 @@
+namespace bts.BlueOrb {
+   using BCG;
+   using System.IO;
+   using System.Diagnostics;
+   using System;
+
+   [DataStreamUserRespresentation("PythonDataframeStream")]
+   public class PythonDataframeStream : ViewStream {
+      private ViewStream _parent_str;
+      private readonly string _in_csv_file_name;
+      private readonly string _out_csv_filename;
+      private readonly string _transform_function;
+      public PythonDataframeStream(ViewStream parent_str, string transform_function) {
+         var guid = System.Guid.NewGuid();
+         _in_csv_file_name = $"pdfs_in_{guid}.csv";
+         _out_csv_filename = $"pdfs_out_{guid}.csv";
+         _parent_str = new CSVSaverStream(parent_str, _in_csv_file_name);
+         _transform_function = transform_function;
+      }
+
+      protected override void myOnFirstSubscriber() {
+         _parent_str.onChange += _parent_str_onchange;
+      }
+
+      protected override void myOnLastSubscriber() {
+         _parent_str.onChange -= _parent_str_onchange;
+      }
+
+      private void _parent_str_onchange(object dp_obj) {
+         Log.assert(dp_obj != null);
+         // the file _in_csv_file_name is now populated.
+         // call py_func_wrapper_main and pass this file name as well
+         // as the output file name
+         // py_func_wrapper_main reads _in_csv_file_name into the df and calls 
+         // transform function, which returns the tranformed df. py_func_wrapper_main then
+         // writes it into the _out_csv_filename file.
+         // now this function should read _out_csv_filename into a dp
+         // and fire it
+         _compute_and_write();
+         ViewStream rs = new SchemaGuesserStream(new CSVReaderStream(_out_csv_filename));
+         IBlueRowCollection nrows = null;
+         rs.onChange += (dp_obj) => {
+            nrows = (dp_obj as DataPacket).newRows;
+         };
+         var dp = BlueDataUtility.build_dp(nrows, myLastValue as DataPacket);
+         myFireEvent(dp);
+      }
+
+      private void _compute_and_write() {
+         File.WriteAllText("user_code.py", _transform_function);
+         // wrapper function
+         string py_func_wrapper_main = @"
+import sys
+from user_code import transform
+import pandas as pd
+
+if __name__ == '__main__':
+   input_file_name = sys.argv[1]
+   output_file_name = sys.argv[2]
+# 1. load input_file_name into df
+# 2. do some test calc
+# 3. write the output of 2 into output_file_name
+   df = pd.read_csv(input_file_name)   
+   df_out = transform(df)
+   df_out.to_csv(output_file_name, index=False)";
+
+
+         File.WriteAllText("runner.py", py_func_wrapper_main);
+
+         ProcessStartInfo psi = new ProcessStartInfo {
+            FileName = "python",
+            Arguments = $"runner.py {_in_csv_file_name} {_out_csv_filename}",
+            RedirectStandardOutput = false,
+            UseShellExecute = false
+         };
+         var proc = Process.Start(psi);
+         proc.WaitForExit();
+
+      }
+
+      #region Unused test code
+      private void _simple_test() {
+
+         // actual function that needs to be called ////////////////////////
+         string py_real_function = @"
+def test(x, out_path):
+   rv = x * 10
+   with open(out_path, 'w') as f:
+      f.write(str(rv))
+   return rv";
+         // the function is in a string object.
+         File.WriteAllText("user_code.py", py_real_function);
+
+
+         // runner app (top level main function) //////////////////////////////
+         string py_func_wrapper_main = @"
+import sys
+from user_code import test
+
+if __name__ == '__main__':
+   arg = int(sys.argv[1])
+   out_path = sys.argv[2]
+   rv = test(arg, out_path)
+   rv = rv + 12
+   with open(out_path, 'w') as f:to \
+      f.write(str(rv))";
+   
+         File.WriteAllText("runner.py", py_func_wrapper_main);
+
+         string outputPath = "py_out.txt";
+         ProcessStartInfo psi = new ProcessStartInfo {
+            FileName = "python",
+            Arguments = $"runner.py 4 {outputPath}",
+            RedirectStandardOutput = false,
+            UseShellExecute = false
+         };
+         var proc = Process.Start(psi);
+         proc.WaitForExit();
+
+         // Now read the output written by the function
+         string result = File.ReadAllText(outputPath);
+         Console.WriteLine(result); // Should print "6"
+
+      }
+      #endregion
+   }
+}
@@ -0,0 +1,30 @@
+using BCG;
+
+namespace bts.BlueOrb {
+   public class SchemaGuesserStream : ViewStream {
+
+      private IBlueRowCollection _rows = null;
+      private ViewStream _vs;
+      public SchemaGuesserStream(ViewStream vs) {
+         _vs = vs;
+      }
+
+      protected override void myOnFirstSubscriber() {
+         _vs.onChange += _on_data;
+      }
+      protected override void myOnLastSubscriber() {
+         _vs.onChange -= _on_data;
+      }
+
+      private void _on_data(object obj) {
+         DataPacket dp = obj as DataPacket;
+         if (_rows == null) {
+            _rows = BlueDataUtility.get_typed_table(dp.newRows);
+         }
+         var dp_out = BlueDataUtility.build_dp_inc(_rows, myLastValue as DataPacket);
+         myFireEvent(dp_out);
+
+      }
+
+   }
+}
@@ -0,0 +1,67 @@
+using Bts.ArithmeticExpressions;
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using BCG;
+
+namespace bts.BlueOrb {
+
+   [DataStreamUserRespresentation("SingleRowMathStream")]
+   public class MathStream : ViewStream, IStreamMapper {
+      private IArithmeticProgram myExp;
+      private BooleanExpressionFilter _bool;
+      List<string> myExtraColumns = new List<string>();
+      BlueTableSchema mySchema;
+
+
+      public MathStream(ViewStream vs, string mathExpression)
+         : this(vs, mathExpression, string.Empty) {
+      }
+
+      public MathStream(ViewStream vs, string mathExpression, string boolean_expression) {
+         myExp = ArithmeticProgramParser.Parse(mathExpression) ??
+            throw new Exception($"Failed to parse ArithmeticExpression '{mathExpression}'");
+         myExtraColumns = myExp.OutputIdentifiers.ToList();
+         if (!string.IsNullOrEmpty(boolean_expression))
+            _bool = new BooleanExpressionFilter(boolean_expression);
+         mySetRealSource(new MapStream(vs, this));
+      }
+
+      #region IStreamMapper Members
+
+      public IBlueTableSchema getOutputSchema(IBlueTableSchema inputSchema) {
+         if (mySchema == null) {
+            Dictionary<string, ColumnInfo> colIdx = new Dictionary<string, ColumnInfo>();
+            foreach (ColumnInfo ci in inputSchema.columnInfo)
+               colIdx[ci.colName] = ci;
+
+            foreach (string ncn in myExtraColumns) {
+               ColumnInfo newC;
+               if (colIdx.ContainsKey(ncn))
+                  newC = new ColumnInfo(colIdx[ncn].colName, colIdx[ncn].colNo, typeof(double));
+               else
+                  newC = new ColumnInfo(ncn, colIdx.Count, typeof(double));
+               colIdx[ncn] = newC;
+            }
+            mySchema = new BlueTableSchema(colIdx.Values.ToArray(), "math(" + inputSchema.tableName + ")");
+         }
+         return mySchema;
+      }
+
+      #endregion
+
+      #region IDynamicStreamMapper Members
+
+      public IBlueRow map(IBlueRow row) {
+         MutableBlueRow result = new MutableBlueRow(mySchema, row);
+         if (_bool == null || _bool.filter(row)) {
+            myExp.Evaluate(result.AsDictionary());
+         }
+         return result;
+      }
+
+      #endregion
+   }
+}
@@ -0,0 +1,17 @@
+namespace bts.BlueOrb {
+   using BCG;
+
+   using System;
+   using System.Collections.Generic;
+   using System.Linq;
+   using System.Text;
+   using System.Threading.Tasks;
+
+   [DataStreamUserRespresentation("SortStream")]
+   public class SortStream: ViewStream {
+      public SortStream (ViewStream parent_stream, string sort_expr) {
+         ViewStream rs = new BCG.SortStream(parent_stream, sort_expr);
+         mySetRealSource(rs);
+      }
+   }
+}
@@ -0,0 +1,16 @@
+namespace bts.BlueOrb {
+   using BCG;
+
+   using System;
+   using System.Collections.Generic;
+   using System.Linq;
+   using System.Text;
+   using System.Threading.Tasks;
+   [DataStreamUserRespresentation("TimeBasedRollingFilterStream")]
+   public class TimeBasedRollingFilterStream : ViewStream {
+      public TimeBasedRollingFilterStream(ViewStream parent_str, string time_col, double n_seconds) {
+         ViewStream rs = new BCG.TimeBasedFilterStream(ViewStreamDatabase.instance, parent_str, time_col, TimeSpan.FromSeconds(n_seconds));
+         mySetRealSource(rs);
+      }
+   }
+}
@@ -2,7 +2,7 @@ using System;

 using BCG;

-namespace bts.SilverPine {
+namespace bts.BlueOrb {
   // Keeps adding changing rows to the stream, hence preserving the history
   // and creating a time series, for example this can be used to make bbo updates
   // into a time series of prices/qty 
@@ -0,0 +1,11 @@
+namespace bts.BlueOrb {
+   using BCG;
+   [DataStreamUserRespresentation("TopStream")]
+   public class TopStream : ViewStream { 
+      public TopStream(ViewStream vs, int n_rows, string sort_col) {
+         ViewStream rs = new BCG.TopStream (vs, n_rows, sort_col);
+         mySetRealSource(rs);
+      }
+   }
+
+}
@@ -0,0 +1,16 @@
+namespace bts.BlueOrb {
+   using System;
+   using System.Collections.Generic;
+
+   using mbts;
+   using BCG;
+
+   [DataStreamUserRespresentation("UnionStream")]
+   public class UnionStream : ViewStream {
+      public UnionStream(ViewStream left_stream, ViewStream right_stream) {
+         ViewStream rs = new BCG.MutableAppendStream(left_stream, right_stream);
+         mySetRealSource(rs);
+      }
+   }
+
+}
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
    <Nullable>enable</Nullable>
  </PropertyGroup>

@@ -18,11 +18,13 @@

  <ItemGroup>
    <PackageReference Include="HtmlAgilityPack" Version="1.11.57" />
+    <PackageReference Include="IronPython" Version="3.4.2" />
    <PackageReference Include="Microsoft.Data.Analysis" Version="0.21.1" />
    <PackageReference Include="MongoDB.Bson" Version="2.23.1" />
    <PackageReference Include="MongoDB.Driver" Version="2.23.1" />
    <PackageReference Include="Parquet.Net" Version="5.0.1" />
    <PackageReference Include="System.Data.SQLite" Version="1.0.118" />
+    <PackageReference Include="MathNet.Numerics" Version="5.0.0" />
  </ItemGroup>

 </Project>
@@ -2,15 +2,27 @@ namespace Bts.DataStream;

 using BCG;

+using bts.api.core;
+
+using Bts.DataStreamCore;
+
+using Microsoft.Extensions.Logging;
+
 using Spark.Core.Disposables;

 using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
 using System.Reactive.Linq;

 public static class DataStreamExtensions {
   public static ViewStream AsViewStream(this IObservable<DataPacket> source) =>
      source as ViewStream ?? new ObservableViewStream(source);

+   public static ViewStream AsViewStream<T>(this IObservable<IDataPacket<T>> source, string? name = null, ILogger? logger = null) where T : IBlueRow =>
+      source as ViewStream ?? new ObservableViewStream(source.Select(dp => new DataPacket(dp.newRows, dp.addedRows, dp.deletedRows)), name, logger);
+
   public static IObservable<DataPacket> AsObservable(this ViewStream source) {
      return source as IObservable<DataPacket> ?? Observable.Create<DataPacket>(Subscribe);

@@ -23,4 +35,100 @@ public static class DataStreamExtensions {
               $"Expected DataPacket, got {newValue?.GetType()}", nameof(newValue)));
      }
   }
+
+   public static IObservable<IDataPacket<T>> SelectDataPacket<T>(this IObservable<IDataPacket> source, Func<IBlueRow, T> selector) where T : IBlueRow =>
+      source.Select(dp => {
+         dp.get_new_added_deleted(out var newRows, out var addedRows, out var deletedRows);
+         return new DataPacket<T>(CastRows(newRows), CastRows(addedRows), CastRows(deletedRows));
+
+         IBlueRowCollection<T> CastRows(ICollection rows) =>
+            new BlueTableSelectorWrapper<T>(
+               rows as IBlueRowCollection ?? new BlueRowCollection(rows, dp.Schema), selector);
+      });
+
+   public static IObservable<TableUpdate<IBlueRow, int>> AsTables(this IObservable<IDataPacket> source) =>
+      source.AsTables<IBlueRow, int>(r => r, r => r.Id());
+
+   public static IObservable<TableUpdate<T, int>> AsTables<T>(this IObservable<IDataPacket> source, Func<IBlueRow, T> valueSelector) where T : IBlueRow =>
+      source.AsTables<T, int>(valueSelector, r => r.Id());
+
+   public static IObservable<TableUpdate<T, int>> AsTables<T>(
+      this IObservable<IDataPacket> source, Func<IBlueRow, T> valueSelector, Func<T, int> keySelector) =>
+      source.AsTables<T, int>(valueSelector, keySelector);
+
+   public static IObservable<TableUpdate<T, TKey>> AsTables<T, TKey>(
+      this IObservable<IDataPacket> source, Func<IBlueRow, T> valueSelector, Func<T, TKey> keySelector, Func<IBlueRow, TKey>? rowKeySelector = null) where TKey : IEquatable<TKey> {
+      rowKeySelector ??= r => keySelector(valueSelector(r));
+      return source.Scan(TableUpdate<T, TKey>.mk_empty(keySelector), (res, dp) => {
+         var bd = res.to_builder();
+         dp.get_new_added_deleted(out var newRows, out var addedRows, out var deletedRows);
+         foreach (IBlueRow r in addedRows) {
+            bd.add_or_update(valueSelector(r));
+         }
+         foreach (IBlueRow r in deletedRows) {
+            bd.remove(rowKeySelector(r));
+         }
+         return bd.to_table();
+      });
+   }
+
+   public static IObservable<IDataPacket<T>> AsDataPackets<T>(this IObservable<TableUpdate<T, int>> source, IBlueTableSchema schema) where T : IBlueRow =>
+      source.Scan(
+         (Table: new BlueTableImmutable<T>(schema), Dp: (IDataPacket<T>)DataPacket<T>.Empty(schema)),
+         (res, table) => {
+            var bd = res.Table.ToDataPacketBuilder();
+            foreach (var r in table.removed) {
+               bd.Remove(r.Id());
+            }
+            foreach (var r in table.added) {
+               bd.AddOrUpdate(r);
+            }
+            var resDp = bd.ToDataPacketT(out var newRows, out var addedRows, out var deletedRows);
+            return (newRows, resDp);
+         })
+         .Where(t => t.Dp.addedRows.Any() || t.Dp.deletedRows.Any())
+         .Select(t => t.Dp);
+
+   public static ViewStream AsViewStream<T>(this IObservable<TableUpdate<T, int>> source, IBlueTableSchema schema) where T : IBlueRow =>
+      source.AsDataPackets(schema).AsViewStream();
+
+   public static int ResolveIndices(this IBlueTableSchema schema, string name) {
+      var indices = ResolveIndices(schema, new[] { name });
+      return indices[0];
+   }
+
+   public static (int, int) ResolveIndices(this IBlueTableSchema schema, string name1, string name2) {
+      var indices = ResolveIndices(schema, new[] { name1, name2 });
+      return (indices[0], indices[1]);
+   }
+
+   public static (int, int, int) ResolveIndices(this IBlueTableSchema schema, string name1, string name2, string name3) {
+      var indices = ResolveIndices(schema, new[] { name1, name2, name3 });
+      return (indices[0], indices[1], indices[2]);
+   }
+
+   public static (int, int, int, int) ResolveIndices(this IBlueTableSchema schema, string name1, string name2, string name3, string name4) {
+      var indices = ResolveIndices(schema, new[] { name1, name2, name3, name4 });
+      return (indices[0], indices[1], indices[2], indices[3]);
+   }
+
+   public static int[] ResolveIndices(this IBlueTableSchema schema, string[] columnNames) {
+      var columns = schema.columnInfo;
+      var indices = new int[columnNames.Length];
+      int nResolved = 0;
+      for (int i = 0; i < columnNames.Length; i++) {
+         int origNResolved = nResolved;
+         for (int j = 0; j < columns.Length; j++) {
+            if (columns[j].colName == columnNames[i]) {
+               indices[i] = j;
+               nResolved++;
+               break;
+            }
+         }
+         if (nResolved == origNResolved) {
+            throw new ArgumentException($"No column named '{columnNames[i]}'", nameof(schema));
+         }
+      }
+      return indices;
+   }
 }
@@ -4,14 +4,21 @@ using BCG;

 using bts;

+using Microsoft.Extensions.Logging;
+
 using System;

 public class ObservableViewStream : ViewStream, IObservable<DataPacket>, IDisposable {
   readonly IObservable<DataPacket> source;
+   readonly string? name;
+   readonly ILogger? logger;
   IDisposable? subscription;

-   public ObservableViewStream(IObservable<DataPacket> source) =>
+   public ObservableViewStream(IObservable<DataPacket> source, string? name = null, ILogger? logger = null) {
      this.source = source;
+      this.name = name;
+      this.logger = logger;
+   }

   public void Dispose() {
      GC.SuppressFinalize(this);
@@ -23,7 +30,13 @@ public class ObservableViewStream : ViewStream, IObservable<DataPacket>, IDispos

   protected override void myOnFirstSubscriber() {
      Log.isnull(subscription);
-      subscription = source.Subscribe(myFireEvent);
+      subscription = source.Subscribe(myFireEvent, OnError, OnCompleted);
+
+      void OnError(Exception exception) =>
+         logger?.LogError("Error in ObservableViewStream. name: {Name}, error: {Exception}", name, exception);
+
+      void OnCompleted() =>
+         logger?.LogInformation("ObservableViewStream completed. name: {Name}", name);
   }

   protected override void myOnLastSubscriber() {
@@ -1,33 +1,51 @@
 using System;
+using System.Collections.Generic;

-namespace BCG {
+namespace BCG {   
   public class AddColumnsStream : ViewStream {
-      public static Tuple<string, Type, object> parse_exp(string exp) {
+      public static Tuple<string, Type, object> parse_single_tok(string exp) {
         string[] toks = exp.Split(':');
-         string col_name = toks[0];
-         string col_value = toks[1];
+         string col_name = toks[0].Trim();
+         string col_value = toks[1].Trim();
         Tuple<Type, object> tup = BlueDataUtility.guess_type(col_value);
         return Tuple.Create(col_name, tup.Item1, tup.Item2);
      }

+      public static List<Tuple<string, Type, object>> parse_exp(string exp) {
+         string[] toks = exp.Split(",");
+         List<Tuple<string, Type, object>> rv = new List<Tuple<string, Type, object>>();
+         foreach (string s in toks) {
+            var tup = parse_single_tok(s.Trim());
+            rv.Add(tup);
+         }
+         return rv;
+      }
+
      private Tuple<string, Type, object> _new_col;
+      private List<Tuple<string, Type, object>> _new_col_map;
      private IBlueTableSchema _out_schema;

      public AddColumnsStream(ViewStream vs, string col_def) {
-         _new_col = parse_exp(col_def);
+         _new_col_map = parse_exp(col_def);
         ViewStream rs = new MapStream(vs, (IBlueTableSchema s) => _get_schema(s), (IBlueRow r) => _map(r));
         mySetRealSource(rs);
      }

      private IBlueTableSchema _get_schema(IBlueTableSchema input_schema) {
-         if (_out_schema == null)
-            _out_schema = BlueDataUtility.add_column(input_schema, _new_col.Item1, _new_col.Item2);
+         if (_out_schema == null) {
+            _out_schema = input_schema;
+            foreach (var m in _new_col_map) {
+               _out_schema = BlueDataUtility.add_column(_out_schema, m.Item1, m.Item2);
+            }
+         }
         return _out_schema;
      }

      private IBlueRow _map(IBlueRow r) {
         MutableBlueRow rv = new MutableBlueRow(_get_schema(r.schema), r);
-         rv.setValue(_new_col.Item1, _new_col.Item3);
+         foreach (var m in _new_col_map) {
+            rv.setValue(m.Item1, m.Item3);
+         }
         return rv;
      }
   }
@@ -1,52 +1,47 @@
 using System;

-namespace BCG
-{
-   [DataStreamUserRespresentation ("count")]
-	public class CountStream : ViewStream
-	{
+namespace bts.BlueOrb {
+   using BCG;
+   [DataStreamUserRespresentation("CountStream")]
+   public class CountStream : ViewStream {
      private DataPacket myLastFiredDataPacket;
-      private IBlueTableSchema mySchema = new BlueTableSchema ("count", 
-         new ColumnInfo ("id", 0, typeof(int)),
-         new ColumnInfo ("count", 1, typeof(int)));
+      private IBlueTableSchema mySchema = new BlueTableSchema("count",
+         new ColumnInfo("id", 0, typeof(int)),
+         new ColumnInfo("count", 1, typeof(int)));
      private int myId = 0;
      private ViewStream myVS;

-      public CountStream (ViewStream vs)
-      {
+      public CountStream(ViewStream vs) {
         myVS = vs;
      }

-      public CountStream (string tableName)
-         : this (new TableStream (tableName))
-      {}
+      public CountStream(string tableName)
+         : this(new TableStream(tableName)) { }

-      protected override void myOnFirstSubscriber () {
+      protected override void myOnFirstSubscriber() {
         myVS.onChange += new ChangeDelegate(myHandleChanges);
      }
-      protected override void myOnLastSubscriber () {
+      protected override void myOnLastSubscriber() {
         myVS.onChange -= new ChangeDelegate(myHandleChanges);
      }


-      private void myHandleChanges(object newValue)
-      {
-         myFireEvent (
+      private void myHandleChanges(object newValue) {
+         myFireEvent(
            myLastFiredDataPacket =
               myLastFiredDataPacket == null ?
-                  new DataPacket (myGetRows (newValue, ++myId), myGetRows (newValue, myId), 
-                  new BlueTable (mySchema))
+                  new DataPacket(myGetRows(newValue, ++myId), myGetRows(newValue, myId),
+                  new BlueTable(mySchema))
                  :
-                  new DataPacket (myGetRows (newValue, ++myId), myGetRows (newValue, myId), 
+                  new DataPacket(myGetRows(newValue, ++myId), myGetRows(newValue, myId),
                  myLastFiredDataPacket.newRows)
            );
      }

-      private IBlueRowCollection myGetRows (object dp, int id)
-      {
-         BlueTable retVal = new BlueTable (mySchema);
+      private IBlueRowCollection myGetRows(object dp, int id) {
+         BlueTable retVal = new BlueTable(mySchema);
         retVal.addRow
-            (new BlueRow (mySchema, id, (dp as DataPacket).newRows.Count));
+            (new BlueRow(mySchema, id, (dp as DataPacket).newRows.Count));
         return retVal;
      }

@@ -5,25 +5,20 @@ using mbts.config;
 using System;
 using System.Text.RegularExpressions;

-namespace BCG.StreamWorld.Addition
-{
-   [DataStreamUserRespresentation (false)]
-   public class FilterStream : ViewStream
-   {
+namespace BCG.StreamWorld.Addition {
+   [DataStreamUserRespresentation(false)]
+   public class FilterStream : ViewStream {
      private ViewStream myBaseStream;
      private BlueTable myBaseTable, myStateTable;
      private IStreamFilter myFilter;

      public FilterStream(ViewStream vs)
-         : this(vs, "1=1")
-      { }
+         : this(vs, "1=1") { }

      public FilterStream(ViewStream vs, string filterExp)
-         : this(vs, new BooleanExpressionFilter(filterExp))
-      { }
+         : this(vs, new BooleanExpressionFilter(filterExp)) { }

-      public FilterStream(ViewStream vs, IStreamFilter filter)
-      {
+      public FilterStream(ViewStream vs, IStreamFilter filter) {
         myBaseStream = vs;
         myFilter = filter;
         if (filter is IDynamicStreamFilter)
@@ -31,43 +26,35 @@ namespace BCG.StreamWorld.Addition
      }


-      protected override void myOnFirstSubscriber()
-      {
+      protected override void myOnFirstSubscriber() {
         myBaseStream.onChange += new ChangeDelegate(myHandleChanges);
      }

-      protected override void myOnLastSubscriber()
-      {
+      protected override void myOnLastSubscriber() {
         myBaseStream.onChange -= new ChangeDelegate(myHandleChanges);
         myBaseTable.clear();
         myStateTable.clear();
      }

-      private void myHandleChanges(object newValue)
-      {
+      private void myHandleChanges(object newValue) {
         DataPacket dp = newValue as DataPacket;
-         if (myStateTable == null)
-         {
+         if (myStateTable == null) {
            bts.Log.assert(myBaseTable == null);
            myStateTable = new BlueTable(dp.schema);
            myBaseTable = new BlueTable(dp.schema);
         }
         BlueTable dels = new BlueTable(dp.schema),
                     adds = new BlueTable(dp.schema);
-         foreach (IBlueRow r in dp.deletedRows)
-         {
+         foreach (IBlueRow r in dp.deletedRows) {
            myBaseTable.deleteRow(r);
-            if (myStateTable.containsID((int)r["id"]))
-            {
+            if (myStateTable.containsID((int)r["id"])) {
               dels.addRow(r);
               myStateTable.deleteRow(r);
            }
         }
-         foreach (IBlueRow r in dp.addedRows)
-         {
+         foreach (IBlueRow r in dp.addedRows) {
            myBaseTable.addRow(r);
-            if (myFilter.filter(r))
-            {
+            if (myFilter.filter(r)) {
               adds.addRow(r);
               myStateTable.addRow(r);
            }
@@ -76,13 +63,10 @@ namespace BCG.StreamWorld.Addition
            myFireEvent(new DataPacket(myStateTable, adds, dels));
      }

-      public IStreamFilter filter
-      {
-         set
-         {
+      public IStreamFilter filter {
+         set {
            myFilter = value;
-            if (myBaseTable != null)
-            {
+            if (myBaseTable != null) {
               IBlueRowCollection oldState = new BlueTable(myStateTable);
               myStateTable.clear();
               foreach (IBlueRow r in myBaseTable)
@@ -52,14 +52,14 @@ namespace BCG {
      }

      public TimeBasedFilter(ViewStreamDatabase vsd, string rowTimeColumnName, TimeSpan rowTimeToLive)
-      : this(vsd, rowTimeColumnName, rowTimeToLive, new TimeSpan(0, 1, 0) /* 1 minute */) {
+      : this(vsd, rowTimeColumnName, rowTimeToLive, rowTimeToLive) {
      }

-      public TimeBasedFilter(ViewStreamDatabase vsd, string rowTimeColumnName, TimeSpan rowTimeToLive, TimeSpan filterFrequency) {
+      public TimeBasedFilter(ViewStreamDatabase vsd, string rowTimeColumnName, TimeSpan rowTimeToLive, TimeSpan filter_period) {
         myVsd = vsd;
         _time_col = rowTimeColumnName;
         _ttl = rowTimeToLive;
-         myFilterFrequency = filterFrequency;
+         _filter_period = filter_period;
         myNextFilter = DateTime.MinValue;

         // add worker
@@ -92,7 +92,7 @@ namespace BCG {
            // fire event
            onFilterChange();

-            myNextFilter = now.Add(myFilterFrequency);
+            myNextFilter = now.Add(_filter_period);
         }
      }
      #endregion
@@ -108,7 +108,7 @@ namespace BCG {
      private ViewStreamDatabase myVsd;
      private string _time_col;
      private TimeSpan _ttl;
-      private TimeSpan myFilterFrequency;
+      private TimeSpan _filter_period;
      private DateTime myNextFilter;
      #endregion
   }
@@ -4,42 +4,46 @@ namespace bts.SilverPine {
   using System;
   using System.Collections.Generic;
   using System.Linq;
+   //using MathNet.Numerics.Statistics;

-   using ZstdSharp.Unsafe;

-   public enum GroupByBundleOp {
+   public enum MultiRowOp {
      Mean,
      Median,
      Mode,
+      Range,
      StdDev,
      Max,
      Min,
      First,
      Last,
-      Sum
+      Sum,
+      EdgeDiff,
+      EdgeDiffPercentage,
+      //IsEdgeDiff,
   }
-   public class GroupByBundle {
-      public readonly List<Tuple<string, GroupByBundleOp>> operations;
+   public class MultiRowOpHelper {
+      public readonly List<Tuple<string, MultiRowOp>> operations;

-      public static GroupByBundle parse(string text) {
+      public static MultiRowOpHelper parse(string text) {
         // text is inp_col: op, inp_col: op, inp_col:op
-         List<Tuple<string, GroupByBundleOp>> rv = new List<Tuple<string, GroupByBundleOp>>();
+         List<Tuple<string, MultiRowOp>> rv = new List<Tuple<string, MultiRowOp>>();
         string[] calcs = text.Split(',');
         foreach (string c in calcs) {
            string[] toks = c.Split(':');
            string inp_col = toks[0].Trim();
            string op_txt = toks[1].Trim();
-            GroupByBundleOp op = Enum.Parse<GroupByBundleOp>(op_txt, true);
+            MultiRowOp op = Enum.Parse<MultiRowOp>(op_txt, true);
            rv.Add(Tuple.Create(inp_col, op));
         }
-         return new GroupByBundle(rv);
+         return new MultiRowOpHelper(rv);
      }

-      public GroupByBundle(List<Tuple<string, GroupByBundleOp>> operations_) {
+      public MultiRowOpHelper(List<Tuple<string, MultiRowOp>> operations_) {
         operations = operations_;
      }

-      public static IBlueRow group_by(List<IBlueRow> rows, GroupByBundle parameters) {
+      public static IBlueRow group_by(List<IBlueRow> rows, MultiRowOpHelper parameters) {
         if (rows.Count() == 0) {
            return null;
         }
@@ -47,8 +51,8 @@ namespace bts.SilverPine {
         IBlueRow ir = rows.ElementAt(0);
         IBlueTableSchema in_schema = ir.schema;
         IBlueTableSchema out_schema = in_schema;
-         IDictionary<string, Tuple<string, GroupByBundleOp>> out_col_map =
-            new Dictionary<string, Tuple<string, GroupByBundleOp>>();
+         IDictionary<string, Tuple<string, MultiRowOp>> out_col_map =
+            new Dictionary<string, Tuple<string, MultiRowOp>>();
         foreach (var t in parameters.operations) {
            string out_col_name = $"{t.Item1}_{t.Item2}".ToLower();
            out_schema = out_schema.add_column(TypeCode.Double, out_col_name);
@@ -58,7 +62,7 @@ namespace bts.SilverPine {
         foreach (var kv in out_col_map) {
            string out_col_name = kv.Key;
            string in_col_name = kv.Value.Item1;
-            GroupByBundleOp op = kv.Value.Item2;
+            MultiRowOp op = kv.Value.Item2;
            IEnumerable<double> col_vals = BlueDataUtility.get_colvalues<double>(rows, in_col_name);
            double comp_res = compute_op(col_vals, op);
            or.setValue(out_col_name, comp_res);
@@ -66,20 +70,51 @@ namespace bts.SilverPine {
         return or;
      }

-      public static double compute_op(IEnumerable<double> col_vals, GroupByBundleOp op) {
+      // rolling_rows are the rolling window of rows. the 0th row is the one thats gettin
+      // calculated. rows 1 - n-1 are its window rows. the schema is based on the operations.
+
+      public IBlueRow rolling_calc(List<IBlueRow> rolling_rows) {
+         if (rolling_rows.Count() == 0) {
+            return null;
+         }
+         IBlueRow ir = rolling_rows.ElementAt(0);
+         IBlueTableSchema in_schema = ir.schema;
+         IBlueTableSchema out_schema = in_schema;
+         IDictionary<string, Tuple<string, MultiRowOp>> out_col_map =
+            new Dictionary<string, Tuple<string, MultiRowOp>>();
+         foreach (var t in operations) {
+            string out_col_name = $"{t.Item1}_{t.Item2}".ToLower();
+            out_schema = out_schema.add_column(TypeCode.Double, out_col_name);
+            out_col_map[out_col_name] = t;
+         }
+         MutableBlueRow or = new MutableBlueRow(out_schema, ir);
+         foreach (var kv in out_col_map) {
+            string out_col_name = kv.Key;
+            string in_col_name = kv.Value.Item1;
+            MultiRowOp op = kv.Value.Item2;
+            IEnumerable<double> col_vals = BlueDataUtility.get_colvalues<double>(rolling_rows, in_col_name);
+            double comp_res = compute_op(col_vals, op);
+            or.setValue(out_col_name, comp_res);
+         }
+         return or;
+      }
+
+      public static double compute_op(IEnumerable<double> col_vals, MultiRowOp op) {
         switch (op) {
-            case GroupByBundleOp.Max:
+            case MultiRowOp.Max:
               return col_vals.Max<double>();
-            case GroupByBundleOp.Min:
+            case MultiRowOp.Min:
               return col_vals.Min<double>();
-            case GroupByBundleOp.Mean:
+            case MultiRowOp.Mean:
               return col_vals.Sum() / col_vals.Count();
-            case GroupByBundleOp.Sum:
+            case MultiRowOp.Sum:
               return col_vals.Sum();
-            case GroupByBundleOp.First:
+            case MultiRowOp.First:
               return col_vals.First();
-            case GroupByBundleOp.Last:
+            case MultiRowOp.Last:
               return col_vals.Last();
+            case MultiRowOp.StdDev:
+               return MathNet.Numerics.Statistics.Statistics.StandardDeviation(col_vals);
            default:
               // TODO
               Log.assert(false);
@@ -5,7 +5,7 @@ using System.Collections.Generic;
 using System.Linq;

 namespace BCG {
-   public class GroupByStream : MethodDrivenStream {
+   internal class GroupByStream : MethodDrivenStream {
      private class MyFuncGroupByEvaluator : IGroupByEvaluator {
         private string[] _groupby_cols;
         private Func<DataPacket, IBlueRow> _groupby_func;
@@ -0,0 +1,20 @@
+namespace bts.SilverPine {
+   using BCG;
+
+   using System;
+
+   [DataStreamUserRespresentation("AggregationStream")]
+   public class AgregationStream : ViewStream {
+
+      public AgregationStream(ViewStream parent_str, string operation_txt) {
+         ViewStream rs = new NonIncGroupByStream(parent_str, String.Empty, operation_txt);
+         mySetRealSource(rs);
+      }
+
+      public AgregationStream(ViewStream parent_str, string groupby_col, string operation_txt) {
+         ViewStream rs = new NonIncGroupByStream(parent_str, groupby_col, operation_txt);
+         mySetRealSource(rs);
+      }
+   }
+
+}
@@ -8,7 +8,7 @@ using bts;
 using bts.SilverPine;

 namespace BCG {
-   [DataStreamUserRespresentation("aggregate")]
+   //[DataStreamUserRespresentation("AggregateStream")]
   public class NonIncGroupByStream : ViewStream {
      private class DelNonIncGroupByEvaluator : INonIncGroupByEvaluator {
         Func<string[]> _groupby_cols_func;
@@ -53,15 +53,18 @@ namespace BCG {
                                 Func<List<IBlueRow>, List<IBlueRow>> evaluate_func)
                                 : this(main_stream, new DelNonIncGroupByEvaluator(groupby_cols_func, evaluate_func)) { }

-      public NonIncGroupByStream(ViewStream parent_str, string groupby_col, string standard_group_by_text, string optional_sort_col = null) {
-         GroupByBundle std_group_by = GroupByBundle.parse(standard_group_by_text);
+      public NonIncGroupByStream(ViewStream parent_str, string groupby_col, string standard_group_by_text)
+      : this(parent_str, groupby_col, standard_group_by_text, String.Empty) { }
+
+      public NonIncGroupByStream(ViewStream parent_str, string groupby_col, string standard_group_by_text, string optional_sort_col) {
+         MultiRowOpHelper std_group_by = MultiRowOpHelper.parse(standard_group_by_text);
         Func<string[]> groupby_cols_func = () => {
            return String.IsNullOrEmpty(groupby_col) ? null : new string[] { groupby_col };
         };
         Func<List<IBlueRow>, List<IBlueRow>> evaluate_func = (group_rows) => {
            if (!String.IsNullOrEmpty(optional_sort_col))
               group_rows.Sort((r1, r2) => BlueDataUtility.compare_rows(r2, r1, optional_sort_col));
-            IBlueRow rv = GroupByBundle.group_by(group_rows, std_group_by);
+            IBlueRow rv = MultiRowOpHelper.group_by(group_rows, std_group_by);
            return new IBlueRow[] { rv }.ToList();
         };
         ViewStream rs = new NonIncGroupByStream(parent_str, groupby_cols_func, evaluate_func);
@@ -1,31 +1,31 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
+//using System;
+//using System.Collections.Generic;
+//using System.Linq;
+//using System.Text;

-namespace BCG
-{
-   public class FullJoinStream : ViewStream
-   {
-      private ViewStream myMainStream;
-      public FullJoinStream(ViewStream v1, string joinCol1, string cmExp1,
-         ViewStream v2, string joinCol2, string cmExp2, string empty_col)
-      {
-         myMainStream = new LeftJoinStream(v1, joinCol1, cmExp1, v2, joinCol2, cmExp2);
-         ViewStream filtered = new LeftJoinStream(v2, joinCol2, cmExp2, v1, joinCol1, cmExp1);
-         filtered = new FilterStream(filtered, String.Format("{0}=null", empty_col));
-         myMainStream = new AppendStream(myMainStream, filtered);
-      }
+//namespace BCG
+//{
+//   public class FullJoinStream : ViewStream
+//   {
+//      private ViewStream myMainStream;
+//      public FullJoinStream(ViewStream v1, string joinCol1, string cmExp1,
+//         ViewStream v2, string joinCol2, string cmExp2, string empty_col)
+//      {
+//         myMainStream = new LeftJoinStream(v1, joinCol1, cmExp1, v2, joinCol2, cmExp2);
+//         ViewStream filtered = new LeftJoinStream(v2, joinCol2, cmExp2, v1, joinCol1, cmExp1);
+//         filtered = new FilterStream(filtered, String.Format("{0}=null", empty_col));
+//         myMainStream = new AppendStream(myMainStream, filtered);
+//      }

-      protected override void myOnFirstSubscriber()
-      {
-         myMainStream.onChange += myHandleMainStreamChange;
-      }
+//      protected override void myOnFirstSubscriber()
+//      {
+//         myMainStream.onChange += myHandleMainStreamChange;
+//      }

-      private void myHandleMainStreamChange(object newData)
-      {
-         IBlueRowCollection result = (newData as DataPacket).newRows;
-         myFireEvent(new DataPacket(result, result, myLastValue == null ? new BlueTable(result.schema) : (myLastValue as DataPacket).newRows));
-      }
-   }
-}
+//      private void myHandleMainStreamChange(object newData)
+//      {
+//         IBlueRowCollection result = (newData as DataPacket).newRows;
+//         myFireEvent(new DataPacket(result, result, myLastValue == null ? new BlueTable(result.schema) : (myLastValue as DataPacket).newRows));
+//      }
+//   }
+//}
@@ -74,7 +74,7 @@ namespace BCG {
      }

      public void _on_stream_cb(object dp_obj) {
-         Log.Gen.info($"NonIncJoinBookkeeper._on_stream_cb dp_obj: {dp_obj}");
+         //Log.Gen.info($"NonIncJoinBookkeeper._on_stream_cb dp_obj: {dp_obj}");
         var timer = Stopwatch.StartNew();
         DataPacket dp = (DataPacket)dp_obj;
         _fill_missing_data(dp);
@@ -50,7 +50,7 @@ namespace BCG {
         int data_col_no = 1;
         for (int jp = 0; jp < _join_specs.Length; jp++) {
            NonIncJoinBookkeeper s = new NonIncJoinBookkeeper(_join_specs[jp], jp, data_col_no, _row_hasher);
-            Log.Gen.info($"NonIncJoinStream.myOnFirstSubscriber jp: {jp} spec: {_join_specs[jp]}");
+            //Log.Gen.info($"NonIncJoinStream.myOnFirstSubscriber jp: {jp} spec: {_join_specs[jp]}");
            data_col_no += _join_specs[jp].data_col_names.Length;
            s.on_new_data += _stream_callback;
            _book_keeping_data.Add(s);
@@ -71,7 +71,7 @@ namespace BCG {
      }

      private void _stream_callback() {
-         Log.Gen.info("NonIncJoinStream._stream_callback received callback");
+         //Log.Gen.info("NonIncJoinStream._stream_callback received callback");
         _is_dirty = true;
         doWork();
      }
@@ -99,7 +99,7 @@ namespace BCG {

      private int _n_total_fires = 0, _n_expensive_fires = 0;
      private void _form_and_fire() {
-         Log.Gen.info($"NonIncJoinStream._form_and_fire _is_ready(): {_is_ready()}");
+         //Log.Gen.info($"NonIncJoinStream._form_and_fire _is_ready(): {_is_ready()}");
         if (_is_ready()) {
            _construct_schema();
            var timer = Stopwatch.StartNew();
@@ -126,11 +126,11 @@ namespace BCG {
            _n_total_fires++;
            //if (timer.ElapsedMilliseconds >= 250) {
            _n_expensive_fires++;
-            string log_msg = $"Join and map time for {_book_keeping_data.Count} "
-               + $"tables {timer.Elapsed.TotalMilliseconds} msecs, ratio {_n_expensive_fires}/{_n_total_fires}";
-            Log.Gen.info(log_msg);
+            //string log_msg = $"Join and map time for {_book_keeping_data.Count} "
+            //   + $"tables {timer.Elapsed.TotalMilliseconds} msecs, ratio {_n_expensive_fires}/{_n_total_fires}";
+            //Log.Gen.info(log_msg);
            //}
-            var dp_out = BlueDataUtility.build_dp_inc(dp_output_rows, myLastValue as DataPacket);
+            var dp_out = BlueDataUtility.build_dp_inc(dp_output_rows, myLastValue as DataPacket, true);
            myFireEvent(dp_out);
            //myFireEvent(new DataPacket(dp_output_rows, dp_output_rows, myLastValue == null ? new BlueTable(_output_schema) : (myLastValue as DataPacket).newRows));
         }
@@ -152,7 +152,7 @@ namespace BCG {
      }

      public void doWork() {
-         Log.Gen.info($"NonIncJoinStream.doWork _last_fire_time: {_last_fire_time} _is_dirty: {_is_dirty}");
+         //Log.Gen.info($"NonIncJoinStream.doWork _last_fire_time: {_last_fire_time} _is_dirty: {_is_dirty}");
         if (DateTime.Now - _last_fire_time >= _throttle_period && _is_dirty) {
            _is_dirty = false;
            _last_fire_time = DateTime.Now;
@@ -69,4 +69,6 @@ namespace bts {
         myFireEvent(dp_out);
      }
   }
+
+
 }
@@ -13,9 +13,8 @@ namespace BCG {
   /// desired row ie newRow = f(row), where f is the mapping fucntion. Note that the id 
   /// is preserved across the rows, ie row["id"] = f(row)["id"]
   /// </summary>
-   [DataStreamUserRespresentation (false)]
-   public class MapStream : MethodDrivenStream
-   {
+   [DataStreamUserRespresentation(false)]
+   public class MapStream : MethodDrivenStream {
      protected IStreamMapper myMapper;
      protected IChangeableStreamMapper myChangeableMapper = null;
      private bool myUseNewMap = Configuration.get<DataStreamConfig>().UseNewMap;
@@ -0,0 +1,14 @@
+namespace bts.SilverPine
+{
+   using BCG;
+
+   [DataStreamUserRespresentation("RollingComputationStream")]
+   public class RollingComputationStream : ViewStream
+   {
+      private ViewStream _parent_str;
+      public RollingComputationStream(ViewStream parent_str, string operation_txt, string roll_column, uint window_sz)
+      {
+
+      }
+   }
+}
@@ -0,0 +1,10 @@
+namespace bts.SilverPine {
+   using BCG;
+
+
+   [DataStreamUserRespresentation("RollingComputationStream")]
+   public class RollingComputationStream : ViewStream {
+      public RollingComputationStream(ViewStream parent_str, string operation_txt, string roll_column, uint window_sz) {
+      }
+   }
+}
@@ -108,6 +108,7 @@ namespace bts {

   }

+   [DataStreamUserRespresentation("Project")]
   public class NewProjectStream : ViewStream, IStreamMapper {

      private ViewStream _stream;
@@ -12,7 +12,7 @@ using System.Collections.Generic;
 using System.Data.SQLite;


-namespace bts.SilverPine {
+namespace bts.BlueOrb{

   public static class SQLiteHelper {
      public static string location = "C:\\Users\\m_tah\\development\\data\\";
@@ -1,14 +1,12 @@
-namespace bts.SilverPine {
+namespace bts.BlueOrb {
   using System;
   using System.Data;
   using System.Data.SQLite;
   using System.Diagnostics;
   using System.Collections;
-
-
   using BCG;

-   [DataStreamUserRespresentation("SQLite")]
+   [DataStreamUserRespresentation("SQLiteStream")]
   public class SQLiteStream : ViewStream {
      private readonly string _connection_string, _query;
      private Stopwatch _stopwatch = new Stopwatch();
@@ -70,4 +68,5 @@ namespace bts.SilverPine {

   }

-}
+}
+
@@ -1,5 +1,6 @@
 using System;

+using BCG;
 using BCG.Utilities.General;

 using bts;
@@ -87,3 +88,17 @@ namespace BCG {
      }
   }
 }
+
+//namespace bts.BlueOrb {
+//   [DataStreamUserRespresentation("MillisecondStream")]
+//   public class MillisecondStream : ViewStream {
+//      public MillisecondStream(ViewStreamDatabase vsd, int interval_msecs, int size) {
+//         ViewStream rs = new BCG.MillisecondStream(vsd, interval_msecs, size);
+//         mySetRealSource(rs);
+//      }
+
+//      public MillisecondStream(int interval_msecs, int size)
+//         : this(interval_msecs, size) {
+//      }
+//   }
+//}
@@ -37,4 +37,42 @@ namespace BCG
      }
         
   }
+
+   [DataStreamUserRespresentation("throttle")]
+   public class ThrottleStream : ViewStream{
+      private readonly ViewStream _main_stream;
+      private readonly TimeSpan _ts;
+      private readonly ViewStreamDatabase _vsd;
+      private DateTime _last_fire_time = DateTime.MinValue;
+
+      public ThrottleStream (ViewStream main_stream, int throttle_seconds)
+      :
+      this(main_stream, TimeSpan.FromSeconds(throttle_seconds), ViewStreamDatabase.instance)
+      {
+      }
+
+      public ThrottleStream (ViewStream main_stream, TimeSpan ts, ViewStreamDatabase vsd){
+         _main_stream = main_stream;
+         _ts = ts;
+         _vsd = vsd;
+      }
+
+       protected override void myOnFirstSubscriber() {
+         _main_stream.onChange += _handle_base_stream_update;
+      }
+
+      protected override void myOnLastSubscriber() {
+         _main_stream.onChange -= _handle_base_stream_update;
+      }
+
+      private void _handle_base_stream_update(object dp_obj){
+         if (DateTime.Now - _last_fire_time >= _ts){
+            DataPacket dp_in = dp_obj as DataPacket;
+            _last_fire_time = DateTime.Now;
+            DataPacket dp = BlueDataUtility.build_dp_inc(dp_in.newRows, myLastValue as DataPacket);
+            myFireEvent(dp);
+         }
+      }
+ }
+
 }
@@ -0,0 +1,40 @@
+namespace bts.SilverPine{
+   using BGC;
+   using System;
+   [DataStreamUserRespresentation("throttle")]
+   public class ThrottleStream : ViewStream{
+      private readonly ViewStream _main_stream;
+      private readonly TimeSpan _ts;
+      private readonly ViewStreamDatabase _vsd;
+      private DateTime _last_fire_time = DateTime.MinValue;
+
+      public ThrottleStream (ViewStream main_stream, int throttle_seconds)
+      :
+      this(main_stream, TimeSpan.FromSeconds(throttle_seconds), ViewStreamDatabase.instance)
+      {
+      }
+
+      public ThrottleStream (ViewStream main_stream, TimeSpan ts, ViewStreamDatabase vsd){
+         _main_stream = main_stream;
+         _ts = ts;
+         _vsd;
+      }
+
+       protected override void myOnFirstSubscriber() {
+         _main_stream.onChange += _handle_base_stream_update;
+      }
+
+      protected override void myOnLastSubscriber() {
+         _main_stream.onChange -= _handle_base_stream_update;
+      }
+
+      private void _handle_base_stream_update(object dp_obj){
+         if (DateTime.Now - _last_fire_time >= _ts){
+            DataPacket dp_in = dp_obj;
+            _last_fire_time = DateTime.Now;
+            DataPacket dp = BlueDataUtility.build_dp_inc(dp_in.newRow, myLastValue as DataPacket);
+            myFireEvent(dp);
+         }
+      }
+ }
+}
@@ -1,124 +1,124 @@
-namespace bts.SilverPine {
-   using BCG;
+//namespace bts.SilverPine {
+//   using BCG;

-   using bts;
-   using bts.collections;
+//   using bts;
+//   //using bts.collections;

-   using System;
-   using System.CodeDom;
-   using System.Collections.Generic;
-   using System.Linq;
+//   using System;
+//   using System.CodeDom;
+//   using System.Collections.Generic;
+//   using System.Linq;

-   // Given 2 filters, and 2 columns, finds the different in the value of the 2 columns from the 2 rows
-   // so:
-   // f1(base_stream.rows)[col1] - f1(base_stream.rows)[col2]
-   [DataStreamUserRespresentation("ColDiff")]
-   public class ColumnDifferenceStream : ViewStream {
-      private readonly ViewStream _base_stream;
-      private readonly FilterStream.OnFilter _f1, _f2;
-      private readonly string _c1, _c2;
+//   // Given 2 filters, and 2 columns, finds the different in the value of the 2 columns from the 2 rows
+//   // so:
+//   // f1(base_stream.rows)[col1] - f1(base_stream.rows)[col2]
+//   [DataStreamUserRespresentation("ColDiff")]
+//   public class ColumnDifferenceStream : ViewStream {
+//      private readonly ViewStream _base_stream;
+//      private readonly FilterStream.OnFilter _f1, _f2;
+//      private readonly string _c1, _c2;

-      public ColumnDifferenceStream(ViewStream base_stream, FilterStream.OnFilter f1, FilterStream.OnFilter f2, string col1, string col2) {
-         _base_stream = base_stream;
-         _f1 = f1;
-         _f2 = f2;
-         _c1 = col1;
-         _c2 = col2;
-      }
+//      public ColumnDifferenceStream(ViewStream base_stream, FilterStream.OnFilter f1, FilterStream.OnFilter f2, string col1, string col2) {
+//         _base_stream = base_stream;
+//         _f1 = f1;
+//         _f2 = f2;
+//         _c1 = col1;
+//         _c2 = col2;
+//      }

-      public ColumnDifferenceStream(ViewStream base_stream, string f1, string f2, string col1, string col2) {
-         FilterStream.OnFilter f1_del = r => {
-            BooleanExpressionFilter rv = new BooleanExpressionFilter(f1);
-            return rv.filter(r);
-         };
-         FilterStream.OnFilter f2_del = r => {
-            BooleanExpressionFilter rv = new BooleanExpressionFilter(f2);
-            return rv.filter(r);
-         };
-         ViewStream rs = new ColumnDifferenceStream(base_stream, f1_del, f2_del, col1, col2);
-         mySetRealSource(rs);
-      }
+//      public ColumnDifferenceStream(ViewStream base_stream, string f1, string f2, string col1, string col2) {
+//         FilterStream.OnFilter f1_del = r => {
+//            BooleanExpressionFilter rv = new BooleanExpressionFilter(f1);
+//            return rv.filter(r);
+//         };
+//         FilterStream.OnFilter f2_del = r => {
+//            BooleanExpressionFilter rv = new BooleanExpressionFilter(f2);
+//            return rv.filter(r);
+//         };
+//         ViewStream rs = new ColumnDifferenceStream(base_stream, f1_del, f2_del, col1, col2);
+//         mySetRealSource(rs);
+//      }

-      // for each row, does a row[new_col_name] = row[col1] - rows[row_ffset][col2]
-      // we should generlize this for any math operation
-      public ColumnDifferenceStream(ViewStream parent_stream, string sort_col_name, int row_offset, string col1, string col2, string diff_col_name, double optional_perc_diff_filter = 0.0) {
-         // use GlobalMapStream
-         string diff_col_perc_name = $"{diff_col_name}_percentage";
-         System.Func<System.Collections.Generic.List<BCG.IBlueRow>, uint, BCG.IBlueRow> g_map_func = (rows, idx) => {
-            int minuend_idx = Convert.ToInt32(idx);
-            var inp_schema = rows[0].schema;
-            var out_schema = inp_schema.add_column(TypeCode.Double, diff_col_name);
-            out_schema = out_schema.add_column(TypeCode.Double, diff_col_perc_name);
-            // minuend - subtrahend
-            IBlueRow minuend_row = rows.ElementAt(minuend_idx);
-            MutableBlueRow rv = new MutableBlueRow(out_schema, minuend_row);
-            int subtrahend_index = minuend_idx + row_offset;
-            double diff_val = Double.NaN, diff_val_perc = Double.NaN;
-            if (subtrahend_index >= 0) {
-               try {
-                  IBlueRow subtrahend_row = rows.ElementAt(subtrahend_index);
-                  diff_val = minuend_row.get<double>(col1) - subtrahend_row.get<double>(col2);
-                  diff_val_perc = 100.0 * diff_val / subtrahend_row.get<double>(col1);
-               } catch (Exception ex) {
-                  Log.assert(false, ex.Message);
-               }
-            }
-            rv.setValue(diff_col_name, diff_val);
-            rv.setValue(diff_col_perc_name, diff_val_perc);
-            return rv;
-         };
-         ViewStream rs = new GlobalMapStream(parent_stream, sort_col_name, g_map_func);
-         if (optional_perc_diff_filter != 0) {
-            rs = new FilterStream(rs, r => {
-               double diff_val_perc = r.get<double>(diff_col_perc_name);
-               double abs_diff_val_perc = Math.Abs(diff_val_perc);
-               return abs_diff_val_perc >= optional_perc_diff_filter;
-            });
-         }
-         mySetRealSource(rs);
-      }
+//      // for each row, does a row[new_col_name] = row[col1] - rows[row_ffset][col2]
+//      // we should generlize this for any math operation
+//      public ColumnDifferenceStream(ViewStream parent_stream, string sort_col_name, int row_offset, string col1, string col2, string diff_col_name, double optional_perc_diff_filter = 0.0) {
+//         // use GlobalMapStream
+//         string diff_col_perc_name = $"{diff_col_name}_percentage";
+//         System.Func<System.Collections.Generic.List<BCG.IBlueRow>, uint, BCG.IBlueRow> g_map_func = (rows, idx) => {
+//            int minuend_idx = Convert.ToInt32(idx);
+//            var inp_schema = rows[0].schema;
+//            var out_schema = inp_schema.add_column(TypeCode.Double, diff_col_name);
+//            out_schema = out_schema.add_column(TypeCode.Double, diff_col_perc_name);
+//            // minuend - subtrahend
+//            IBlueRow minuend_row = rows.ElementAt(minuend_idx);
+//            MutableBlueRow rv = new MutableBlueRow(out_schema, minuend_row);
+//            int subtrahend_index = minuend_idx + row_offset;
+//            double diff_val = Double.NaN, diff_val_perc = Double.NaN;
+//            if (subtrahend_index >= 0) {
+//               try {
+//                  IBlueRow subtrahend_row = rows.ElementAt(subtrahend_index);
+//                  diff_val = minuend_row.get<double>(col1) - subtrahend_row.get<double>(col2);
+//                  diff_val_perc = 100.0 * diff_val / subtrahend_row.get<double>(col1);
+//               } catch (Exception ex) {
+//                  Log.assert(false, ex.Message);
+//               }
+//            }
+//            rv.setValue(diff_col_name, diff_val);
+//            rv.setValue(diff_col_perc_name, diff_val_perc);
+//            return rv;
+//         };
+//         ViewStream rs = new GlobalMapStream(parent_stream, sort_col_name, g_map_func);
+//         if (optional_perc_diff_filter != 0) {
+//            rs = new FilterStream(rs, r => {
+//               double diff_val_perc = r.get<double>(diff_col_perc_name);
+//               double abs_diff_val_perc = Math.Abs(diff_val_perc);
+//               return abs_diff_val_perc >= optional_perc_diff_filter;
+//            });
+//         }
+//         mySetRealSource(rs);
+//      }

-      protected override void myOnFirstSubscriber() {
-         _base_stream.onChange += _handle_base_stream_update;
-      }
+//      protected override void myOnFirstSubscriber() {
+//         _base_stream.onChange += _handle_base_stream_update;
+//      }

-      protected override void myOnLastSubscriber() {
-         _base_stream.onChange -= _handle_base_stream_update;
-      }
+//      protected override void myOnLastSubscriber() {
+//         _base_stream.onChange -= _handle_base_stream_update;
+//      }

-      private void _handle_base_stream_update(object dp_obj) {
-         // could have been done with filter and cartesian prod, and then math
-         DataPacket dp = dp_obj as DataPacket;
-         List<IBlueRow> rows = dp.newRows.to_list();
-         var f1_rows = rows.Where(r => _f1(r));
-         //Log.assert(f1_rows.Count() == 1);
-         var f2_rows = rows.Where(r => _f2(r));
-         //Log.assert(f2_rows.Count() == 1);
-         if (f1_rows != null && f1_rows.Count() > 0 && f2_rows != null && f2_rows.Count() > 0) {
-            IBlueRow f1_r = f1_rows.ElementAt(0);
-            IBlueRow f2_r = f2_rows.ElementAt(0);
-            double diff = f1_r.get<double>(_c1) - f2_r.get<double>(_c2);
-            IBlueTableSchema out_schema = f1_r.schema.add_columns(Tuple.Create(typeof(double), "diff"));
-            BlueTable out_table = new BlueTable(out_schema);
-            MutableBlueRow out_row = new MutableBlueRow(out_schema, f1_r);
-            out_row.setValue("diff", diff);
-            out_table.addRow(out_row);
-            DataPacket dp_out = BlueDataUtility.build_dp(out_table, myLastValue as DataPacket);
-            myFireEvent(dp_out);
-         } else {
-            IBlueRow f1_r = rows.ElementAt(0);
-            IBlueRow f2_r = rows.ElementAt(0);
-            double diff = Double.NaN;
-            IBlueTableSchema out_schema = f1_r.schema.add_columns(Tuple.Create(typeof(double), "diff"));
-            BlueTable out_table = new BlueTable(out_schema);
-            MutableBlueRow out_row = new MutableBlueRow(out_schema, f1_r);
-            out_row.setValue("diff", diff);
-            out_table.addRow(out_row);
-            DataPacket dp_out = BlueDataUtility.build_dp(out_table, myLastValue as DataPacket);
-            myFireEvent(dp_out);
-         }
+//      private void _handle_base_stream_update(object dp_obj) {
+//         // could have been done with filter and cartesian prod, and then math
+//         DataPacket dp = dp_obj as DataPacket;
+//         List<IBlueRow> rows = dp.newRows.to_list();
+//         var f1_rows = rows.Where(r => _f1(r));
+//         //Log.assert(f1_rows.Count() == 1);
+//         var f2_rows = rows.Where(r => _f2(r));
+//         //Log.assert(f2_rows.Count() == 1);
+//         if (f1_rows != null && f1_rows.Count() > 0 && f2_rows != null && f2_rows.Count() > 0) {
+//            IBlueRow f1_r = f1_rows.ElementAt(0);
+//            IBlueRow f2_r = f2_rows.ElementAt(0);
+//            double diff = f1_r.get<double>(_c1) - f2_r.get<double>(_c2);
+//            IBlueTableSchema out_schema = f1_r.schema.add_columns(Tuple.Create(typeof(double), "diff"));
+//            BlueTable out_table = new BlueTable(out_schema);
+//            MutableBlueRow out_row = new MutableBlueRow(out_schema, f1_r);
+//            out_row.setValue("diff", diff);
+//            out_table.addRow(out_row);
+//            DataPacket dp_out = BlueDataUtility.build_dp(out_table, myLastValue as DataPacket);
+//            myFireEvent(dp_out);
+//         } else {
+//            IBlueRow f1_r = rows.ElementAt(0);
+//            IBlueRow f2_r = rows.ElementAt(0);
+//            double diff = Double.NaN;
+//            IBlueTableSchema out_schema = f1_r.schema.add_columns(Tuple.Create(typeof(double), "diff"));
+//            BlueTable out_table = new BlueTable(out_schema);
+//            MutableBlueRow out_row = new MutableBlueRow(out_schema, f1_r);
+//            out_row.setValue("diff", diff);
+//            out_table.addRow(out_row);
+//            DataPacket dp_out = BlueDataUtility.build_dp(out_table, myLastValue as DataPacket);
+//            myFireEvent(dp_out);
+//         }

-      }
-   }
+//      }
+//   }

-}
+//}
@@ -40,4 +40,4 @@ namespace BCG {
            myFireSwitch = myLastFiredPacket.addedRows.Count + myLastFiredPacket.deletedRows.Count == 0 ? false : true;
        }
    }
-}
+}
@@ -1,118 +1,118 @@
-using System;
-using System.Data;
-using System.Collections;
-using BCG.Utilities;
-using BCG.Utilities.General;
-namespace BCG
-{
-   /// <summary>
-   /// AppendStream appends 2 tables with each other, with a generated id having no bearing to the original id.
-   /// The column ordering the 2 tables need not be the same
-   /// </summary>
-   public class AppendStream : UnionStream
-   {
-      private bool myUseNewAppend = DataStreamLoadFileConfig.instance.useNewAppend;
-      public AppendStream(ViewStream v1, ViewStream v2)
-      {
-         if (myUseNewAppend)
-            mySetRealSource(new MutableAppendStream(v1, v2));
-         else
-         {
-            myLeftVs = v1;
-            myRightVs = v2;
-         }
-      }
+//using System;
+//using System.Data;
+//using System.Collections;
+//using BCG.Utilities;
+//using BCG.Utilities.General;
+//namespace BCG
+//{
+//   /// <summary>
+//   /// AppendStream appends 2 tables with each other, with a generated id having no bearing to the original id.
+//   /// The column ordering the 2 tables need not be the same
+//   /// </summary>
+//   public class AppendStream : UnionStream
+//   {
+//      private bool myUseNewAppend = DataStreamLoadFileConfig.instance.useNewAppend;
+//      public AppendStream(ViewStream v1, ViewStream v2)
+//      {
+//         if (myUseNewAppend)
+//            mySetRealSource(new MutableAppendStream(v1, v2));
+//         else
+//         {
+//            myLeftVs = v1;
+//            myRightVs = v2;
+//         }
+//      }

-      public AppendStream (params ViewStream[] vss)
-      {
+//      public AppendStream (params ViewStream[] vss)
+//      {

-         if (myUseNewAppend)
-            mySetRealSource(new MutableAppendStream(vss));
-         else
-         {
-            if (vss.Length == 1)
-               mySetRealSource(vss[0]);
-            else if (vss.Length > 1) 
-            {
-               AppendStream rv = null;
-               foreach (ViewStream s in vss)
-                  rv = rv == null ? new AppendStream(new ViewStream[] { s }) : new AppendStream(rv, s);
-               mySetRealSource(rv);
-            }
-            else
-               //don't do anything if they didnt' supply any viewstreams
-               mySetRealSource(null);
-         }
+//         if (myUseNewAppend)
+//            mySetRealSource(new MutableAppendStream(vss));
+//         else
+//         {
+//            if (vss.Length == 1)
+//               mySetRealSource(vss[0]);
+//            else if (vss.Length > 1) 
+//            {
+//               AppendStream rv = null;
+//               foreach (ViewStream s in vss)
+//                  rv = rv == null ? new AppendStream(new ViewStream[] { s }) : new AppendStream(rv, s);
+//               mySetRealSource(rv);
+//            }
+//            else
+//               //don't do anything if they didnt' supply any viewstreams
+//               mySetRealSource(null);
+//         }
          
-      }
+//      }

-      public override void add (IBlueRowCollection rows, bool isLeft) 
-      {
-         IDictionary index = isLeft ? myLeftIndex : myRightIndex;
-         int[] indexToIndexMap = isLeft ? myLeftIndexToIndexMap : myRightIndexToIndexMap;
-         foreach (IBlueRow row in rows)
-         {
-            UnionRow newRow = new UnionRow (myLastFiredPacket.newRows.schema, row, 
-               myIdCounter ++, myIdIndex, indexToIndexMap);
-            ((BlueTable)myLastFiredPacket.newRows).addRow (newRow);
-            index[row["id"]] =  newRow;
-            ((BlueTable)(myLastFiredPacket.addedRows)).addRow (newRow);
-         }
-      }
+//      public override void add (IBlueRowCollection rows, bool isLeft) 
+//      {
+//         IDictionary index = isLeft ? myLeftIndex : myRightIndex;
+//         int[] indexToIndexMap = isLeft ? myLeftIndexToIndexMap : myRightIndexToIndexMap;
+//         foreach (IBlueRow row in rows)
+//         {
+//            UnionRow newRow = new UnionRow (myLastFiredPacket.newRows.schema, row, 
+//               myIdCounter ++, myIdIndex, indexToIndexMap);
+//            ((BlueTable)myLastFiredPacket.newRows).addRow (newRow);
+//            index[row["id"]] =  newRow;
+//            ((BlueTable)(myLastFiredPacket.addedRows)).addRow (newRow);
+//         }
+//      }

-      public override void delete (IBlueRowCollection rows, bool isLeft) 
-      {
-         IDictionary index = isLeft ? myLeftIndex : myRightIndex;
-         foreach (IBlueRow axedRow in rows)
-         {
-            int rowId = (int)axedRow["id"];
-            IBlueRow row = (IBlueRow)index[rowId];
-            index.Remove (rowId);
-            ((BlueTable)myLastFiredPacket.newRows).deleteRow (row);
-            ((BlueTable)(myLastFiredPacket.deletedRows)).addRow (row);
-         }
-      }
+//      public override void delete (IBlueRowCollection rows, bool isLeft) 
+//      {
+//         IDictionary index = isLeft ? myLeftIndex : myRightIndex;
+//         foreach (IBlueRow axedRow in rows)
+//         {
+//            int rowId = (int)axedRow["id"];
+//            IBlueRow row = (IBlueRow)index[rowId];
+//            index.Remove (rowId);
+//            ((BlueTable)myLastFiredPacket.newRows).deleteRow (row);
+//            ((BlueTable)(myLastFiredPacket.deletedRows)).addRow (row);
+//         }
+//      }

-      public override void mergeChanges (IBlueRowCollection dels, IBlueRowCollection adds, bool isLeft)
-      {
-         IDictionary temp = new Hashtable ();
-         IDictionary index = isLeft ? myLeftIndex : myRightIndex;
-         int[] indexToIndexMap = isLeft ? myLeftIndexToIndexMap : myRightIndexToIndexMap;
-         IBlueRow corrRow;
-         foreach (IBlueRow dRow in dels)
-         {
-            corrRow = index[dRow["id"]] as IBlueRow;
-            (myLastFiredPacket.newRows as BlueTable).deleteRow (corrRow);
-            (myLastFiredPacket.deletedRows as BlueTable).addRow (corrRow);
-            index.Remove (dRow["id"]);
-            if (adds.containsID ((int)dRow["id"]))
-            {
-               IBlueRow r = adds[(int)dRow["id"]];
-               corrRow = new UnionRow (myLastFiredPacket.schema, r, (int)corrRow["id"], myIdIndex, indexToIndexMap);
-               (myLastFiredPacket.newRows as BlueTable).addRow (corrRow);
-               (myLastFiredPacket.addedRows as BlueTable).addRow (corrRow);
-               index.Add (r["id"], corrRow);
-               temp.Add (r["id"], true);
-            }
-         }
-         foreach (IBlueRow aRow in adds)
-         {
-            if (!temp.Contains (aRow["id"]))
-            {
-               corrRow = new UnionRow (myLastFiredPacket.schema, aRow, myIdCounter++, myIdIndex, indexToIndexMap);
-               (myLastFiredPacket.newRows as BlueTable).addRow (corrRow);
-               (myLastFiredPacket.addedRows as BlueTable).addRow (corrRow);
-               index.Add (aRow["id"], corrRow);
-            }
-         }
-      }
-   }
+//      public override void mergeChanges (IBlueRowCollection dels, IBlueRowCollection adds, bool isLeft)
+//      {
+//         IDictionary temp = new Hashtable ();
+//         IDictionary index = isLeft ? myLeftIndex : myRightIndex;
+//         int[] indexToIndexMap = isLeft ? myLeftIndexToIndexMap : myRightIndexToIndexMap;
+//         IBlueRow corrRow;
+//         foreach (IBlueRow dRow in dels)
+//         {
+//            corrRow = index[dRow["id"]] as IBlueRow;
+//            (myLastFiredPacket.newRows as BlueTable).deleteRow (corrRow);
+//            (myLastFiredPacket.deletedRows as BlueTable).addRow (corrRow);
+//            index.Remove (dRow["id"]);
+//            if (adds.containsID ((int)dRow["id"]))
+//            {
+//               IBlueRow r = adds[(int)dRow["id"]];
+//               corrRow = new UnionRow (myLastFiredPacket.schema, r, (int)corrRow["id"], myIdIndex, indexToIndexMap);
+//               (myLastFiredPacket.newRows as BlueTable).addRow (corrRow);
+//               (myLastFiredPacket.addedRows as BlueTable).addRow (corrRow);
+//               index.Add (r["id"], corrRow);
+//               temp.Add (r["id"], true);
+//            }
+//         }
+//         foreach (IBlueRow aRow in adds)
+//         {
+//            if (!temp.Contains (aRow["id"]))
+//            {
+//               corrRow = new UnionRow (myLastFiredPacket.schema, aRow, myIdCounter++, myIdIndex, indexToIndexMap);
+//               (myLastFiredPacket.newRows as BlueTable).addRow (corrRow);
+//               (myLastFiredPacket.addedRows as BlueTable).addRow (corrRow);
+//               index.Add (aRow["id"], corrRow);
+//            }
+//         }
+//      }
+//   }

-   public class MergeStream : ViewStream
-   {
-      public MergeStream (ViewStream v1, ViewStream v2, string[] mergeCols)
-      {
-         mySetRealSource (new DistinctRowStream (new AppendStream (v1, v2), mergeCols));
-      }
-   }
-}
+//   public class MergeStream : ViewStream
+//   {
+//      public MergeStream (ViewStream v1, ViewStream v2, string[] mergeCols)
+//      {
+//         mySetRealSource (new DistinctRowStream (new AppendStream (v1, v2), mergeCols));
+//      }
+//   }
+//}
@@ -1,186 +1,172 @@
 using System;
 using System.Collections.Generic;
+
 using mbts;
+//using BCG;

-namespace BCG
-{
-   internal class MutableAppendTable : IBlueRowCollection
-   {
-      private class MyRow : IBlueRow
-      {
-         private IBlueRow myRow;
-         private int myID;
-
-         public MyRow(IBlueRow r, int id)
-         {
-            myRow = r;
-            myID = id;
-         }
-
-         #region IBlueRow Members
-
-         public IBlueTableSchema schema { get { return myRow.schema; } }
-
-         public object this[int index]
-         {
-            get
-            {
-               if (myRow.schema[index].colName == "id")
-                  return myID;
-               else
-                  return myRow[index];
-            }
-         }
-
-         public object this[string colName] { get { return colName == "id" ? (object)myID : myRow[colName]; } }
-
-         #endregion
-
-         #region IDictionary Members
-
-         public void Add(object key, object value) { throw new Exception("Row is read only."); }
-
-         public void Clear() { throw new Exception("Row is read only."); }
-
-         public bool Contains(object key) { return myRow.Contains(key); }
-
-         public System.Collections.IDictionaryEnumerator GetEnumerator() { return new BlueRowDictionaryEnumerator(this); }
-
-         public bool IsFixedSize { get { return true; } }
-
-         public bool IsReadOnly { get { return true; } }
-
-         public System.Collections.ICollection Keys { get { return myRow.Keys; } }
-
-         public void Remove(object key) {throw new Exception("The method or operation is not implemented.");}
-
-         public System.Collections.ICollection Values
-         {
-            get
-            {
-               object[] vals = new object[myRow.Count];
-               CopyTo(vals, 0);
-               return vals;
-            }
-         }
-
-         public object this[object key]
-         {
-            get { return key is string ? this[key as string] : this[(int)key]; }
-            set { throw new Exception("The method or operation is not implemented."); }
-         }
-
-         #endregion
-
-         #region ICollection Members
-
-         public void CopyTo(Array array, int index)
-         {
-            myRow.CopyTo(array, index);
-            array.SetValue(myID, index + myRow.schema["id"].colNo);
-         }
-
-         public int Count { get { return myRow.Count; } }
-
-         public bool IsSynchronized { get { return myRow.IsSynchronized; } }
-
-         public object SyncRoot { get { return myRow.SyncRoot; } }
-
-         #endregion
-
-         #region IEnumerable Members
-
-         System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
-         { return new BlueRowEnumerator(this); }
-
-         #endregion
-      }
-
-      private BlueTable myRows;
-      private int myID = 0;
-      /// <summary>
-      /// maps the table no to a dictionary containing the
-      /// local IDs to a row in the final big table
-      /// </summary>
-      private Dictionary<int, Dictionary<int, IBlueRow>> myIDMap = new Dictionary<int, Dictionary<int, IBlueRow>>();
-
-      public MutableAppendTable(IBlueTableSchema schema) { myRows = new BlueTable(schema); }
-
-      public IBlueRow addRow(IBlueRow r, int tableNo)
-      {
-         if (!myIDMap.ContainsKey(tableNo))
-            myIDMap.Add(tableNo, new Dictionary<int, IBlueRow>());
-         IBlueRow nr = new MyRow(r, myID++); // BlueDataUtility.getNewReplacedRow(r, myID++, "id");
-         myRows.addRow(nr);
-         myIDMap[tableNo].Add((int)r["id"], nr);
-         return nr;
-      }
-
-      public IBlueRow removeRow(IBlueRow r, int tableNo)
-      {
-         IBlueRow dr = myIDMap[tableNo][(int)r["id"]];
-         myRows.deleteRow(dr);
-         myIDMap[tableNo].Remove((int)r["id"]);
-         return dr;
-      }
-
-      public IBlueRowCollection removeTable(int tableNo)
-      {
-         if (!myIDMap.ContainsKey(tableNo))
-            return null;
-         else
-         {
-            BlueTable rv = new BlueTable(myRows.schema);
-            foreach (IBlueRow r in myIDMap[tableNo].Values)
-               rv.addRow(r);
-            myRows.deleteRows(rv);
-            myIDMap.Remove(tableNo);
-            return rv;
-         }
-      }
-
-      public void clear()
-      {
-         myRows.clear();
-         myIDMap.Clear();
-      }
-
-      #region IBlueRowCollection Members
-
-      public IBlueRow this[int id] { get { return myRows[id]; } }
-
-      public IBlueTableSchema schema { get { return myRows.schema; } }
-
-      public bool containsID(int id) {return myRows.containsID(id);}
-
-      #endregion
-
-      #region ICollection Members
-
-      public void CopyTo(Array array, int index) { myRows.CopyTo(array, index); }
-
-      public int Count { get { return myRows.Count; } }
-
-      public bool IsSynchronized { get { return myRows.IsSynchronized; } }
-
-      public object SyncRoot { get { return myRows.SyncRoot; } }
-
-      #endregion
-
-      #region IEnumerable Members
-
-      public System.Collections.IEnumerator GetEnumerator() {return myRows.GetEnumerator();}
-
-      #endregion
-   }
-   /// <summary>
+namespace BCG {
+    /// <summary>
   /// MutableStream can append multiple streams
   /// as well as give the user the flexibility
   /// to append (or remove) more streams at
   /// runtime
   /// </summary>
-   public class MutableAppendStream : ViewStream
-   {
+   //[DataStreamUserRespresentation("UnionStream")]
+   public class MutableAppendStream : ViewStream {
+      internal class MutableAppendTable : IBlueRowCollection {
+         private class MyRow : IBlueRow {
+            private IBlueRow myRow;
+            private int myID;
+
+            public MyRow(IBlueRow r, int id) {
+               myRow = r;
+               myID = id;
+            }
+
+            #region IBlueRow Members
+
+            public IBlueTableSchema schema { get { return myRow.schema; } }
+
+            public object this[int index] {
+               get {
+                  if (myRow.schema[index].colName == "id")
+                     return myID;
+                  else
+                     return myRow[index];
+               }
+            }
+
+            public object this[string colName] { get { return colName == "id" ? (object)myID : myRow[colName]; } }
+
+            #endregion
+
+            #region IDictionary Members
+
+            public void Add(object key, object value) { throw new Exception("Row is read only."); }
+
+            public void Clear() { throw new Exception("Row is read only."); }
+
+            public bool Contains(object key) { return myRow.Contains(key); }
+
+            public System.Collections.IDictionaryEnumerator GetEnumerator() { return new BlueRowDictionaryEnumerator(this); }
+
+            public bool IsFixedSize { get { return true; } }
+
+            public bool IsReadOnly { get { return true; } }
+
+            public System.Collections.ICollection Keys { get { return myRow.Keys; } }
+
+            public void Remove(object key) { throw new Exception("The method or operation is not implemented."); }
+
+            public System.Collections.ICollection Values {
+               get {
+                  object[] vals = new object[myRow.Count];
+                  CopyTo(vals, 0);
+                  return vals;
+               }
+            }
+
+            public object this[object key] {
+               get { return key is string ? this[key as string] : this[(int)key]; }
+               set { throw new Exception("The method or operation is not implemented."); }
+            }
+
+            #endregion
+
+            #region ICollection Members
+
+            public void CopyTo(Array array, int index) {
+               myRow.CopyTo(array, index);
+               array.SetValue(myID, index + myRow.schema["id"].colNo);
+            }
+
+            public int Count { get { return myRow.Count; } }
+
+            public bool IsSynchronized { get { return myRow.IsSynchronized; } }
+
+            public object SyncRoot { get { return myRow.SyncRoot; } }
+
+            #endregion
+
+            #region IEnumerable Members
+
+            System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return new BlueRowEnumerator(this); }
+
+            #endregion
+         }
+
+         private BlueTable myRows;
+         private int myID = 0;
+         /// <summary>
+         /// maps the table no to a dictionary containing the
+         /// local IDs to a row in the final big table
+         /// </summary>
+         private Dictionary<int, Dictionary<int, IBlueRow>> myIDMap = new Dictionary<int, Dictionary<int, IBlueRow>>();
+
+         public MutableAppendTable(IBlueTableSchema schema) { myRows = new BlueTable(schema); }
+
+         public IBlueRow addRow(IBlueRow r, int tableNo) {
+            if (!myIDMap.ContainsKey(tableNo))
+               myIDMap.Add(tableNo, new Dictionary<int, IBlueRow>());
+            IBlueRow nr = new MyRow(r, myID++); // BlueDataUtility.getNewReplacedRow(r, myID++, "id");
+            myRows.addRow(nr);
+            myIDMap[tableNo].Add((int)r["id"], nr);
+            return nr;
+         }
+
+         public IBlueRow removeRow(IBlueRow r, int tableNo) {
+            IBlueRow dr = myIDMap[tableNo][(int)r["id"]];
+            myRows.deleteRow(dr);
+            myIDMap[tableNo].Remove((int)r["id"]);
+            return dr;
+         }
+
+         public IBlueRowCollection removeTable(int tableNo) {
+            if (!myIDMap.ContainsKey(tableNo))
+               return null;
+            else {
+               BlueTable rv = new BlueTable(myRows.schema);
+               foreach (IBlueRow r in myIDMap[tableNo].Values)
+                  rv.addRow(r);
+               myRows.deleteRows(rv);
+               myIDMap.Remove(tableNo);
+               return rv;
+            }
+         }
+
+         public void clear() {
+            myRows.clear();
+            myIDMap.Clear();
+         }
+
+         #region IBlueRowCollection Members
+
+         public IBlueRow this[int id] { get { return myRows[id]; } }
+
+         public IBlueTableSchema schema { get { return myRows.schema; } }
+
+         public bool containsID(int id) { return myRows.containsID(id); }
+
+         #endregion
+
+         #region ICollection Members
+
+         public void CopyTo(Array array, int index) { myRows.CopyTo(array, index); }
+
+         public int Count { get { return myRows.Count; } }
+
+         public bool IsSynchronized { get { return myRows.IsSynchronized; } }
+
+         public object SyncRoot { get { return myRows.SyncRoot; } }
+
+         #endregion
+
+         #region IEnumerable Members
+
+         public System.Collections.IEnumerator GetEnumerator() { return myRows.GetEnumerator(); }
+
+         #endregion
+      }
      private bool mySubscriptionActive = false;
      private MutableAppendTable myTable;
      private int myMovingIndex;
@@ -188,22 +174,18 @@ namespace BCG
      private bool _allign_col_orders = true;

      public MutableAppendStream(params ViewStream[] streams)
-         : this(new List<ViewStream>(streams))
-      { }
+         : this(new List<ViewStream>(streams)) {
+      }

      public MutableAppendStream(bool allign_col_order, params ViewStream[] streams)
-         : this(allign_col_order, new List<ViewStream>(streams))
-      { }
+         : this(allign_col_order, new List<ViewStream>(streams)) { }

      public MutableAppendStream(ICollection<ViewStream> streams)
-         : this(true, streams)
-      { }
+         : this(true, streams) { }

-      public MutableAppendStream(bool allign_col_orders, ICollection<ViewStream> streams)
-      {
+      public MutableAppendStream(bool allign_col_orders, ICollection<ViewStream> streams) {
         _allign_col_orders = allign_col_orders;
-         foreach (ViewStream vs in streams)
-         {
+         foreach (ViewStream vs in streams) {
            myMovingIndex++;
            ViewStream pj = new ChangeTableNameStream(vs, myMovingIndex.ToString());
            if (_allign_col_orders)
@@ -212,8 +194,7 @@ namespace BCG
         }
      }

-      public void addStream(ViewStream vs)
-      {
+      public void addStream(ViewStream vs) {
         myMovingIndex++;
         ///the change name is done to identify the callbacks, and the project to
         ///make all the schemas col orders the same
@@ -225,19 +206,14 @@ namespace BCG
            pj.onChange += new ChangeDelegate(myHandleStreamChanges);
      }

-      public void removeStream(ViewStream vs)
-      {
+      public void removeStream(ViewStream vs) {
         int index = -1;
-         foreach (KeyValuePair<int, Pair<ViewStream, ViewStream>> p in myStreamIndex)
-         {
-            if (p.Value.first == vs)
-            {
+         foreach (KeyValuePair<int, Pair<ViewStream, ViewStream>> p in myStreamIndex) {
+            if (p.Value.first == vs) {
               index = p.Key;
-               if (mySubscriptionActive)
-               {
+               if (mySubscriptionActive) {
                  p.Value.second.onChange -= new ChangeDelegate(myHandleStreamChanges);
-                  if (myTable != null)
-                  {
+                  if (myTable != null) {
                     IBlueRowCollection delRows = myTable.removeTable(p.Key);
                     if (delRows != null)
                        myFireEvent(new DataPacket(myTable, new BlueTable(myTable.schema), delRows));
@@ -250,15 +226,13 @@ namespace BCG
         }
      }

-      protected override void myOnFirstSubscriber()
-      {
+      protected override void myOnFirstSubscriber() {
         mySubscriptionActive = true;
         foreach (KeyValuePair<int, Pair<ViewStream, ViewStream>> p in myStreamIndex)
            p.Value.second.onChange += new ChangeDelegate(myHandleStreamChanges);
      }

-      protected override void myOnLastSubscriber()
-      {
+      protected override void myOnLastSubscriber() {
         mySubscriptionActive = false;
         foreach (KeyValuePair<int, Pair<ViewStream, ViewStream>> p in myStreamIndex)
            p.Value.second.onChange -= new ChangeDelegate(myHandleStreamChanges);
@@ -266,20 +240,17 @@ namespace BCG
            myTable.clear();
      }

-      private void myHandleStreamChanges(object newValue)
-      {         
+      private void myHandleStreamChanges(object newValue) {
         DataPacket dp = newValue as DataPacket;
         myTable = myTable ?? new MutableAppendTable(new BlueTableSchema("MutableAppend", dp.schema.columnInfo));
         BlueTable adds = new BlueTable(myTable.schema),
                     dels = new BlueTable(myTable.schema);
         int index = Int32.Parse(dp.schema.tableName);
-         foreach (IBlueRow r in dp.deletedRows)
-         {
+         foreach (IBlueRow r in dp.deletedRows) {
            IBlueRow dr = myTable.removeRow(r, index);
            dels.addRow(dr);
         }
-         foreach (IBlueRow r in dp.addedRows)
-         {
+         foreach (IBlueRow r in dp.addedRows) {
            IBlueRow nr = myTable.addRow(r, index);
            adds.addRow(nr);
         }
@@ -287,3 +258,13 @@ namespace BCG
      }
   }
 }
+
+
+//namespace bts.BlueOrb {
+//   public class UnionStream : ViewStream {
+//      public UnionStream(ViewStream left_stream, ViewStream right_stream) {
+//         ViewStream rs = new BCG.MutableAppendStream(left_stream, right_stream);
+//         mySetRealSource(rs);
+//      }
+//   }
+//}
@@ -1,63 +1,63 @@
-using System;
+//using System;

-namespace BCG
-{
-   /// <summary>
-   /// Respresents a Union Operand. Hooks up to the Stream delegate, and alerts the UnionStream
-   /// on receiving updates
-   /// </summary>
-   public class UnionOperand 
-   {
-      private bool myIsLeft;
-      private DataPacket myLastArrivedPacket;
-      private UnionStream myMaster;
+//namespace BCG
+//{
+//   /// <summary>
+//   /// Respresents a Union Operand. Hooks up to the Stream delegate, and alerts the UnionStream
+//   /// on receiving updates
+//   /// </summary>
+//   public class UnionOperand 
+//   {
+//      private bool myIsLeft;
+//      private DataPacket myLastArrivedPacket;
+//      private UnionStream myMaster;
       
-      public UnionOperand (bool isLeft, UnionStream master)
-      {
-         myIsLeft = isLeft;
-         myMaster = master;
-      }
+//      public UnionOperand (bool isLeft, UnionStream master)
+//      {
+//         myIsLeft = isLeft;
+//         myMaster = master;
+//      }

-      internal void myChangeHandler (object o)
-      {
-         if (myLastArrivedPacket != null)
-            mySubsequentChangeHandler ((DataPacket)o);
-         else
-         {
-            myLastArrivedPacket = (DataPacket)o;
-            myFirstChangeHandler ((DataPacket)o);
-         }
-      }
+//      internal void myChangeHandler (object o)
+//      {
+//         if (myLastArrivedPacket != null)
+//            mySubsequentChangeHandler ((DataPacket)o);
+//         else
+//         {
+//            myLastArrivedPacket = (DataPacket)o;
+//            myFirstChangeHandler ((DataPacket)o);
+//         }
+//      }

-      private void myFirstChangeHandler(DataPacket dp)
-      {
-         myMaster.startSession ();
-         myMaster.add (dp.newRows, myIsLeft);
-         myMaster.endSession ();
-      }
+//      private void myFirstChangeHandler(DataPacket dp)
+//      {
+//         myMaster.startSession ();
+//         myMaster.add (dp.newRows, myIsLeft);
+//         myMaster.endSession ();
+//      }

-      private void mySubsequentChangeHandler (DataPacket dp)
-      {
-         myMaster.startSession ();  
-         //myMaster.delete (dp.deletedRows, myIsLeft);
-         //myMaster.add (dp.addedRows, myIsLeft);
-         myMaster.mergeChanges (dp.deletedRows, dp.addedRows, myIsLeft);
-         myMaster.endSession ();
-      }
+//      private void mySubsequentChangeHandler (DataPacket dp)
+//      {
+//         myMaster.startSession ();  
+//         //myMaster.delete (dp.deletedRows, myIsLeft);
+//         //myMaster.add (dp.addedRows, myIsLeft);
+//         myMaster.mergeChanges (dp.deletedRows, dp.addedRows, myIsLeft);
+//         myMaster.endSession ();
+//      }

-      public IBlueTableSchema opSchema
-      {
-         get
-         {
-            if (myLastArrivedPacket == null  || myLastArrivedPacket.newRows == null)
-               return null;
-            return myLastArrivedPacket.newRows.schema;
-         }
-      }
+//      public IBlueTableSchema opSchema
+//      {
+//         get
+//         {
+//            if (myLastArrivedPacket == null  || myLastArrivedPacket.newRows == null)
+//               return null;
+//            return myLastArrivedPacket.newRows.schema;
+//         }
+//      }

-      public void init ()
-      {
-         myLastArrivedPacket = null;
-      }
-   }
-}
+//      public void init ()
+//      {
+//         myLastArrivedPacket = null;
+//      }
+//   }
+//}
@@ -1,119 +1,119 @@
-using System;
-using System.Data;
-using System.Collections;
-using BCG.Utilities;
-using BCG.Utilities.General;
-namespace BCG
-{
-   /// <summary>
-   /// Provides a live stream of Union of 2 streams
-   /// </summary>
-   public abstract class UnionStream : ViewStream 
-   {
-      protected UnionOperand myLeftOp, myRightOp;
-      protected ViewStream myLeftVs, myRightVs;
-      protected DataPacket myLastFiredPacket;
-      protected IDictionary myLeftIndex = new Hashtable (), myRightIndex = new Hashtable ();
-      protected int[] myLeftIndexToIndexMap, myRightIndexToIndexMap;
-      protected int myIdCounter, myIdIndex;
+//using System;
+//using System.Data;
+//using System.Collections;
+//using BCG.Utilities;
+//using BCG.Utilities.General;
+//namespace BCG
+//{
+//   /// <summary>
+//   /// Provides a live stream of Union of 2 streams
+//   /// </summary>
+//   public abstract class UnionStream : ViewStream 
+//   {
+//      protected UnionOperand myLeftOp, myRightOp;
+//      protected ViewStream myLeftVs, myRightVs;
+//      protected DataPacket myLastFiredPacket;
+//      protected IDictionary myLeftIndex = new Hashtable (), myRightIndex = new Hashtable ();
+//      protected int[] myLeftIndexToIndexMap, myRightIndexToIndexMap;
+//      protected int myIdCounter, myIdIndex;

-      protected override void myOnFirstSubscriber() 
-      {
-         myLeftOp = new UnionOperand (true, this);
-         myRightOp = new UnionOperand (false, this);
-         myLeftVs.onChange += new DataStream.ChangeDelegate (myLeftOp.myChangeHandler);
-         myRightVs.onChange += new DataStream.ChangeDelegate (myRightOp.myChangeHandler);
-      }
+//      protected override void myOnFirstSubscriber() 
+//      {
+//         myLeftOp = new UnionOperand (true, this);
+//         myRightOp = new UnionOperand (false, this);
+//         myLeftVs.onChange += new DataStream.ChangeDelegate (myLeftOp.myChangeHandler);
+//         myRightVs.onChange += new DataStream.ChangeDelegate (myRightOp.myChangeHandler);
+//      }

-      protected override void myOnLastSubscriber () 
-      {
-         myInit ();
-         myLeftVs.onChange -= new DataStream.ChangeDelegate (myLeftOp.myChangeHandler);
-         myRightVs.onChange -= new DataStream.ChangeDelegate (myRightOp.myChangeHandler);
-      }
+//      protected override void myOnLastSubscriber () 
+//      {
+//         myInit ();
+//         myLeftVs.onChange -= new DataStream.ChangeDelegate (myLeftOp.myChangeHandler);
+//         myRightVs.onChange -= new DataStream.ChangeDelegate (myRightOp.myChangeHandler);
+//      }

-      public void startSession ()
-      {
-         if (myLastFiredPacket == null)
-         {
-            myLastFiredPacket = new DataPacket ();
-            if (myLeftOp.opSchema != null)//ie call back initiated by left operand
-            {
-               myLeftIndexToIndexMap = myInitIndexToIndex (myLeftOp.opSchema, myLeftOp.opSchema);
-               myLastFiredPacket.newRows = new BlueTable (myLeftOp.opSchema);
-               myIdIndex = myLeftOp.opSchema["id"].colNo;
-            }
-            else
-            {
-               myRightIndexToIndexMap = myInitIndexToIndex (myRightOp.opSchema, myRightOp.opSchema);
-               myLastFiredPacket.newRows = new BlueTable (myRightOp.opSchema);
-               myIdIndex = myRightOp.opSchema["id"].colNo;
-            }
-         }
-         else if (myRightIndexToIndexMap == null && myRightOp.opSchema != null)
-            myRightIndexToIndexMap = myInitIndexToIndex (myLeftOp.opSchema, myRightOp.opSchema);
-         else if (myLeftIndexToIndexMap == null && myLeftOp.opSchema != null)
-            myLeftIndexToIndexMap = myInitIndexToIndex (myRightOp.opSchema, myLeftOp.opSchema);
-         myLastFiredPacket.addedRows = new BlueTable (myLastFiredPacket.newRows.schema);
-         myLastFiredPacket.deletedRows = new BlueTable (myLastFiredPacket.newRows.schema);
-      }
+//      public void startSession ()
+//      {
+//         if (myLastFiredPacket == null)
+//         {
+//            myLastFiredPacket = new DataPacket ();
+//            if (myLeftOp.opSchema != null)//ie call back initiated by left operand
+//            {
+//               myLeftIndexToIndexMap = myInitIndexToIndex (myLeftOp.opSchema, myLeftOp.opSchema);
+//               myLastFiredPacket.newRows = new BlueTable (myLeftOp.opSchema);
+//               myIdIndex = myLeftOp.opSchema["id"].colNo;
+//            }
+//            else
+//            {
+//               myRightIndexToIndexMap = myInitIndexToIndex (myRightOp.opSchema, myRightOp.opSchema);
+//               myLastFiredPacket.newRows = new BlueTable (myRightOp.opSchema);
+//               myIdIndex = myRightOp.opSchema["id"].colNo;
+//            }
+//         }
+//         else if (myRightIndexToIndexMap == null && myRightOp.opSchema != null)
+//            myRightIndexToIndexMap = myInitIndexToIndex (myLeftOp.opSchema, myRightOp.opSchema);
+//         else if (myLeftIndexToIndexMap == null && myLeftOp.opSchema != null)
+//            myLeftIndexToIndexMap = myInitIndexToIndex (myRightOp.opSchema, myLeftOp.opSchema);
+//         myLastFiredPacket.addedRows = new BlueTable (myLastFiredPacket.newRows.schema);
+//         myLastFiredPacket.deletedRows = new BlueTable (myLastFiredPacket.newRows.schema);
+//      }

-      private int[] myInitIndexToIndex (IBlueTableSchema sch1, IBlueTableSchema sch2)
-      {
-         //BlueEventLog.logAssert (sch1.columnNames.Length.Equals (sch2.columnNames.Length));
-         //foreach (string colName in sch1.columnNames)
-         //   BlueEventLog.logAssert (sch2[colName] != null);
-         if(!sch1.columnNames.Length.Equals(sch2.columnNames.Length))
-            throw new BlueDataException("Union stream: different schemas");
-         foreach(string colName in sch1.columnNames)
-         {
-            if(sch2[colName] == null)
-               throw new BlueDataException("Union stream: can't find " + colName);
-         }
-         int[] retVal = new int[sch1.columnNames.Length];
-         for (int i = 0; i < retVal.Length; i++)
-            retVal[i] = sch2[sch1[i].colName].colNo;
-         return retVal;
-      }
+//      private int[] myInitIndexToIndex (IBlueTableSchema sch1, IBlueTableSchema sch2)
+//      {
+//         //BlueEventLog.logAssert (sch1.columnNames.Length.Equals (sch2.columnNames.Length));
+//         //foreach (string colName in sch1.columnNames)
+//         //   BlueEventLog.logAssert (sch2[colName] != null);
+//         if(!sch1.columnNames.Length.Equals(sch2.columnNames.Length))
+//            throw new BlueDataException("Union stream: different schemas");
+//         foreach(string colName in sch1.columnNames)
+//         {
+//            if(sch2[colName] == null)
+//               throw new BlueDataException("Union stream: can't find " + colName);
+//         }
+//         int[] retVal = new int[sch1.columnNames.Length];
+//         for (int i = 0; i < retVal.Length; i++)
+//            retVal[i] = sch2[sch1[i].colName].colNo;
+//         return retVal;
+//      }

-      public virtual void endSession ()
-      {
-         myFireEvent (myLastFiredPacket.Clone ());
-      }
+//      public virtual void endSession ()
+//      {
+//         myFireEvent (myLastFiredPacket.Clone ());
+//      }

-      public abstract void add (IBlueRowCollection rows, bool isLeft);
+//      public abstract void add (IBlueRowCollection rows, bool isLeft);

-      public abstract void delete (IBlueRowCollection rows, bool isLeft);
+//      public abstract void delete (IBlueRowCollection rows, bool isLeft);

-      public abstract void mergeChanges (IBlueRowCollection dels, IBlueRowCollection adds, bool isLeft);
+//      public abstract void mergeChanges (IBlueRowCollection dels, IBlueRowCollection adds, bool isLeft);
      
-      private void myInit ()
-      {
-         myLastFiredPacket = null;
-         myLeftOp.init ();
-         myRightOp.init ();
-         myLeftIndex.Clear ();
-         myRightIndex.Clear ();
-         myIdCounter = myIdIndex = 0;
-         myLeftIndexToIndexMap = myRightIndexToIndexMap = null;
-      }
+//      private void myInit ()
+//      {
+//         myLastFiredPacket = null;
+//         myLeftOp.init ();
+//         myRightOp.init ();
+//         myLeftIndex.Clear ();
+//         myRightIndex.Clear ();
+//         myIdCounter = myIdIndex = 0;
+//         myLeftIndexToIndexMap = myRightIndexToIndexMap = null;
+//      }

-      /// <summary>
-      /// Used for test purposes only. Users of this class specifically, should ignore it 
-      /// (too bad, the NUnit cant see the private methods)
-      /// </summary>
-      /// <param name="dp"></param>
-      /// <param name="isLeft"></param>
-      internal void receiveStream (DataPacket dp, bool isLeft)
-      {
-         if (isLeft)
-            myLeftOp.myChangeHandler (dp);
-         else
-            myRightOp.myChangeHandler (dp);
-      }
-      public void receiveStreamTest(DataPacket dp, bool isLeft)
-      {
-          receiveStream(dp, isLeft);
-      }
-   }
-}
+//      /// <summary>
+//      /// Used for test purposes only. Users of this class specifically, should ignore it 
+//      /// (too bad, the NUnit cant see the private methods)
+//      /// </summary>
+//      /// <param name="dp"></param>
+//      /// <param name="isLeft"></param>
+//      internal void receiveStream (DataPacket dp, bool isLeft)
+//      {
+//         if (isLeft)
+//            myLeftOp.myChangeHandler (dp);
+//         else
+//            myRightOp.myChangeHandler (dp);
+//      }
+//      public void receiveStreamTest(DataPacket dp, bool isLeft)
+//      {
+//          receiveStream(dp, isLeft);
+//      }
+//   }
+//}
@@ -0,0 +1,73 @@
+namespace Bts.DataStream;
+
+using BCG;
+
+using bts.api.core;
+
+using Bts.DataStreamCore;
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+
+public class TableUpdateDataPacket<T> : IDataPacket<T> where T : IBlueRow {
+   readonly TableUpdate<T, int> table;
+   readonly IBlueTableSchema schema;
+
+   public TableUpdateDataPacket(TableUpdate<T, int> table, IBlueTableSchema schema) {
+      this.table = table;
+      this.schema = schema;
+   }
+
+   public IBlueRowCollection<T> newRows {
+      get {
+         var rv = new BlueTableImmutable<T>(schema);
+         return rv;
+      }
+   }
+
+   public IBlueRowCollection<T> addedRows => throw new NotImplementedException();
+
+   public IBlueRowCollection<T> deletedRows => throw new NotImplementedException();
+
+   class MyRowCollection : IBlueRowCollection<T> {
+      readonly TableUpdate<T, int> table;
+      readonly IEnumerable<T> items;
+      Lazy<SortedList<int, T>> itemList;
+
+      public MyRowCollection(IEnumerable<T> items, IBlueTableSchema schema) {
+         this.items = items;
+         this.schema = schema;
+         itemList = new(() => {
+            var rv = new SortedList<int, T>();
+            foreach (var item in this.items) {
+               rv.Add(item.Id(), item);
+            }
+            return rv;
+         });
+      }
+
+      public int Count => itemList.Value.Count;
+      public bool IsSynchronized => false;
+      public object SyncRoot => this;
+
+      public T this[int id] => itemList.Value[id];
+
+      public IBlueTableSchema schema { get; }
+
+      public bool containsID(int id) =>
+         itemList.Value.ContainsKey(id);
+
+      public void CopyTo(Array array, int index) {
+      }
+
+      public IEnumerator<T> GetEnumerator() {
+         throw new NotImplementedException();
+      }
+
+      IEnumerator IEnumerable.GetEnumerator() {
+         throw new NotImplementedException();
+      }
+   }
+}
@@ -114,6 +114,15 @@ namespace BCG {
            rv.Add(r.get<T>(col));
         return rv;
      }
+      public static IEnumerable<T> get_colvalues<T>(IEnumerable<IBlueRow> rows, int start_idx, int n_items,string col) {
+         List<T> rv = new List<T>();
+         int end_idx = Math.Min(start_idx + n_items, rows.Count());
+         for (int i = start_idx; i < end_idx; i++) {
+            var r = rows.ElementAt(i);
+            rv.Add(r.get<T>(col));
+         }
+         return rv;
+      }
      public static IEnumerable<T> get_colvalues<T>(IEnumerable<IBlueRow> rows, string col, int start_index, int count) {
         List<T> rv = new List<T>();
         int i = 0;
@@ -280,6 +289,28 @@ namespace BCG {

      #region json

+      public static void write_to_json_file(this IBlueRowCollection table, string file_path) { 
+         write_dict_to_json_file(file_path, table.to_namevalue_pairs());
+      }
+
+      public static void write_dict_to_json_file(string file_path, List<Dictionary<string, string>> data) {
+         var options = new JsonSerializerOptions { WriteIndented = true };
+         string json = System.Text.Json.JsonSerializer.Serialize(data, options);
+         File.WriteAllText(file_path, json);
+      }
+
+      public static List<Dictionary<string, string>> ReadFromFile(string filePath) {
+         string json = File.ReadAllText(filePath);
+         return System.Text.Json.JsonSerializer.Deserialize<List<Dictionary<string, string>>>(json);
+      }
+
+      public static void write_table_to_json(IBlueRowCollection table) {
+         List<Dictionary<string, string>> rows = new List<Dictionary<string, string>>();
+         foreach (IBlueRow row in table) {
+            row.to_json();
+         }
+      }
+
      public static Dictionary<string, string> convert_json_to_dictionary(string json_string) {
         Dictionary<string, string> dictionary = JsonConvert.DeserializeObject<Dictionary<string, string>>(json_string);
         return dictionary;
@@ -348,6 +379,14 @@ namespace BCG {
         }
         return rv;
      }
+
+      public static List<Dictionary<string,string>> to_namevalue_pairs(this IBlueRowCollection table) {
+         List<Dictionary<string, string>> rv = new List<Dictionary<string, string>>();
+         foreach (IBlueRow r in table) {
+            rv.Add(r.to_dict());
+         }
+         return rv;
+      }
      #region Schema types
      // these are the only types allowed in schemas
      private static IReadOnlyDictionary<TypeCode, Type> _typecode_to_type = new Dictionary<TypeCode, Type>
@@ -1225,6 +1264,20 @@ namespace BCG {
         return rv;
      }

+      public static Dictionary<string, string> to_dict(this IBlueRow r) {
+         Dictionary<string, string> map = new Dictionary<string, string>();
+         foreach (ColumnInfo c in r.schema.columnInfo) {
+            map.Add(c.colName, r[c.colName].ToString());
+         }
+         return map;
+      }
+
+      public static string to_json(this IBlueRow r) {
+         Dictionary<string, string> map = r.to_dict();
+         string json = System.Text.Json.JsonSerializer.Serialize(map);
+         return json;
+      }
+
      public static void compute_differences_fast(IBlueRowCollection new_rows, IBlueRowCollection old_rows,
                                                  out IBlueRowCollection out_d_rows, out IBlueRowCollection out_a_rows) {
         if (old_rows == null || old_rows.Count == 0) {
@@ -0,0 +1,56 @@
+#nullable enable
+namespace Bts.DataStreamCore;
+
+using BCG;
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+
+public class BlueRowCollection : IBlueRowCollection {
+   readonly ICollection source;
+   readonly Func<int, IBlueRow> findRow;
+   readonly Func<int, bool> containsKey;
+
+   public BlueRowCollection(ICollection source, IBlueTableSchema schema, Func<int, IBlueRow>? findRow = null, Func<int, bool>? containsKey = null) {
+      this.source = source;
+      this.schema = schema;
+      if (findRow is null || containsKey is null) {
+         if (source is IBlueRowCollection brc) {
+            findRow ??= id => brc[id];
+            containsKey ??= brc.containsID;
+         } else if (source is IDictionary dict) {
+            findRow ??= id => dict[id] as IBlueRow ?? throw new KeyNotFoundException();
+            containsKey ??= id => dict.Contains(id);
+         } else if (source is IDictionary<int, IBlueRow> genDict) {
+            findRow ??= id => genDict[id];
+            containsKey ??= genDict.ContainsKey;
+         } else if (source is IReadOnlyDictionary<int, IBlueRow> roGenDict) {
+            findRow ??= id => roGenDict[id];
+            containsKey = roGenDict.ContainsKey;
+         } else {
+            var cachedRows = new Lazy<Dictionary<int, IBlueRow>>(() =>
+               source.Cast<IBlueRow>().ToDictionary(r => r.Id()));
+            findRow ??= id => cachedRows.Value[id];
+            // Don't remove this lambda expression. Intellisense may suggest it, but that would
+            // instantiate 'cachedRows' immediately and defeat the purpose of using Lazy<T>.
+            containsKey ??= id => cachedRows.Value.ContainsKey(id);
+         }
+      }
+      this.findRow = findRow;
+      this.containsKey = containsKey;
+   }
+
+   public IBlueRow this[int id] => findRow(id);
+
+   public IBlueTableSchema schema { get; }
+
+   public int Count => source.Count;
+
+   public bool containsID(int id) =>
+      containsKey(id);
+
+   public IEnumerator GetEnumerator() =>
+      source.GetEnumerator();
+}
@@ -96,3 +96,125 @@ public class BlueTableImmutable : IBlueRowCollection, IImmutableRowCollection {
         new(schema, table.ToImmutable());
   }
 }
+
+public class BlueTableImmutable<T> : IBlueRowCollection<T> where T : IBlueRow {
+   readonly ImmutableDictionary<int, T> rows;
+
+   public BlueTableImmutable(IBlueTableSchema schema)
+      : this(schema, ImmutableDictionary<int, T>.Empty) { }
+
+   public BlueTableImmutable(IBlueTableSchema schema, ImmutableDictionary<int, T> rows) {
+      this.schema = schema;
+      this.rows = rows;
+   }
+
+   public int Count => rows.Count;
+   public bool IsSynchronized => false;
+   public IBlueTableSchema schema { get; }
+   public object SyncRoot => this;
+
+   public T this[int id] => rows[id];
+
+   public bool containsID(int id) =>
+      rows.ContainsKey(id);
+
+   public void CopyTo(Array array, int index) {
+      foreach (var r in rows.Values) {
+         array.SetValue(r, index++);
+      }
+   }
+
+   public IEnumerator<T> GetEnumerator() =>
+      rows.Values.GetEnumerator();
+
+   IEnumerator IEnumerable.GetEnumerator() =>
+      GetEnumerator();
+
+   public DataPacketBuilder ToDataPacketBuilder() =>
+      new(this);
+
+   public class DataPacketBuilder {
+      readonly IBlueTableSchema schema;
+      readonly ImmutableDictionary<int, T>.Builder table;
+      readonly ImmutableDictionary<int, T>.Builder added =
+         ImmutableDictionary<int, T>.Empty.ToBuilder();
+      readonly ImmutableDictionary<int, T>.Builder removed =
+         ImmutableDictionary<int, T>.Empty.ToBuilder();
+
+      public DataPacketBuilder(BlueTableImmutable<T> table) {
+         schema = table.schema;
+         this.table = table.rows.ToBuilder();
+      }
+
+      public void AddOrUpdate(T row, IEqualityComparer<IBlueRow>? comparer = null) {
+         var id = row.Id();
+         if (table.TryGetValue(id, out var orig)) {
+            if (comparer?.Equals(row, orig) ?? false) {
+               // No op: This row was already in the table (according to 'comparer').
+               // Remove it from 'added' and 'removed'.
+               added.Remove(id);
+               removed.Remove(id);
+               return;
+            }
+            // Change op: A row with this id was already in the table,
+            // but its values have changed (according to 'comparer').
+            removed[id] = orig;
+         }
+         added[id] = row;
+      }
+
+      public void Remove(int id) {
+         added.Remove(id);
+         if (table.TryGetValue(id, out var orig)) {
+            removed[id] = orig;
+         }
+      }
+
+      public DataPacket ToDataPacket(bool reset = true) {
+         table.RemoveRange(removed.Keys);
+         table.AddRange(added);
+         var newRows = new BlueTableImmutable<T>(schema, table.ToImmutable());
+         var addedRows = new BlueTableImmutable<T>(schema, added.ToImmutable());
+         var removedRows = new BlueTableImmutable<T>(schema, removed.ToImmutable());
+         if (reset) {
+            added.Clear();
+            removed.Clear();
+         }
+         return new(newRows, addedRows, removedRows);
+      }
+
+      public IDataPacket<T> ToDataPacketT(bool reset = true) {
+         table.RemoveRange(removed.Keys);
+         table.AddRange(added);
+         var newRows = new BlueTableImmutable<T>(schema, table.ToImmutable());
+         var addedRows = new BlueTableImmutable<T>(schema, added.ToImmutable());
+         var removedRows = new BlueTableImmutable<T>(schema, removed.ToImmutable());
+         if (reset) {
+            added.Clear();
+            removed.Clear();
+         }
+         return new DataPacket<T>(newRows, addedRows, removedRows);
+      }
+
+      public IDataPacket<T> ToDataPacketT(
+         out BlueTableImmutable<T> newRows,
+         out BlueTableImmutable<T> addedRows,
+         out BlueTableImmutable<T> removedRows,
+         bool reset = true
+      ) {
+         table.RemoveRange(removed.Keys);
+         table.AddRange(added);
+         newRows = new BlueTableImmutable<T>(schema, table.ToImmutable());
+         addedRows = new BlueTableImmutable<T>(schema, added.ToImmutable());
+         removedRows = new BlueTableImmutable<T>(schema, removed.ToImmutable());
+         if (reset) {
+            added.Clear();
+            removed.Clear();
+         }
+         return new DataPacket<T>(newRows, addedRows, removedRows);
+      }
+
+      public BlueTableImmutable<T> ToImmutable() =>
+         new(schema, table.ToImmutable());
+   }
+}
@@ -0,0 +1,29 @@
+#nullable enable
+namespace Bts.DataStreamCore;
+
+using BCG;
+
+using System;
+using System.Collections.Generic;
+
+public class BlueTableSchemaBuilder {
+   readonly string? tableName;
+   readonly List<(string Name, Type Type)> colDefs = new();
+
+   public BlueTableSchemaBuilder(string? tableName = null) =>
+      this.tableName = tableName;
+
+   public void Add<T>(string Name) =>
+      colDefs.Add((Name, typeof(T)));
+
+   public void Add(string Name, Type Type) =>
+      colDefs.Add((Name, Type));
+
+   public IBlueTableSchema ToSchema(string? tableName = null) {
+      var colInfos = new ColumnInfo[colDefs.Count];
+      for (int i = 0; i < colInfos.Length; i++) {
+         colInfos[i] = new(colDefs[i].Name, i, colDefs[i].Type);
+      }
+      return new BlueTableSchema(colInfos, tableName ?? this.tableName);
+   }
+}
@@ -0,0 +1,16 @@
+#nullable enable
+namespace Bts.DataStreamCore;
+
+using BCG;
+
+using System;
+
+public class BlueTableSchemaFactory {
+   public static IBlueTableSchema Create(string tableName, params (string Name, Type Type)[] columns) {
+      var colInfos = new ColumnInfo[columns.Length];
+      for (int i = 0; i < columns.Length; i++) {
+         colInfos[i] = new(columns[i].Name, i, columns[i].Type);
+      }
+      return new BlueTableSchema(colInfos, tableName);
+   }
+}
@@ -0,0 +1,39 @@
+#nullable enable
+namespace Bts.DataStreamCore;
+
+using BCG;
+
+using System;
+using System.Collections.Generic;
+
+public static class BlueTableSelectorWrapper {
+   public static BlueTableSelectorWrapper<T> Create<T>(
+      IBlueRowCollection source, Func<IBlueRow, T> selector, IBlueTableSchema? schema = null) where T : IBlueRow =>
+      new(source, selector, schema);
+}
+
+public class BlueTableSelectorWrapper<T> : IBlueRowCollection<T> where T : IBlueRow {
+   readonly IBlueRowCollection source;
+   readonly Func<IBlueRow, T> selector;
+
+   public BlueTableSelectorWrapper(IBlueRowCollection source, Func<IBlueRow, T> selector, IBlueTableSchema? schema = null) {
+      this.source = source;
+      this.selector = selector;
+      this.schema = schema ?? source.schema;
+   }
+
+   public T this[int id] => selector(source[id]);
+
+   public IBlueTableSchema schema { get; }
+
+   public int Count => source.Count;
+
+   public bool containsID(int id) =>
+      source.containsID(id);
+
+   public IEnumerator<T> GetEnumerator() {
+      foreach (IBlueRow r in source) {
+         yield return selector(r);
+      }
+   }
+}
@@ -1,4 +1,5 @@
 using System;
+using System.Text.Json.Serialization;

 namespace BCG {
   /// <summary>
@@ -56,9 +57,16 @@ namespace BCG {
      private Type myColType;
      private object myColValue;

+      [JsonPropertyName("colNo")]
      public int colNo { get { return myColNo; } }
+
+      [JsonPropertyName("colName")]
      public string colName { get { return myColName; } }
+
+      [JsonPropertyName("colType")]
      public Type colType { get { return myColType; } }
+
+      [JsonIgnore]
      public object colValue {get{return myColValue;}}
   }
 }
@@ -1,5 +1,6 @@
 using System;
 using System.Collections;
+using System.Collections.Generic;

 namespace BCG
 {
@@ -15,5 +16,23 @@ namespace BCG
      IBlueRow this[int id]{get;}
      IBlueTableSchema schema {get;}
      bool containsID (int id);
+
+      bool ICollection.IsSynchronized => false;
+      object ICollection.SyncRoot => this;
+
+      void ICollection.CopyTo(Array array, int index) {
+         foreach (IBlueRow r in this) {
+            array.SetValue(r, index++);
+         }
+      }
+   }
+
+   public interface IBlueRowCollection<T> : IBlueRowCollection, IReadOnlyCollection<T> where T : IBlueRow {
+      new T this[int id] { get; }
+
+      IBlueRow IBlueRowCollection.this[int id] => this[id];
+
+      IEnumerator IEnumerable.GetEnumerator() =>
+         GetEnumerator();
   }
 }
				`@@ -0,0 +1 @@`
				`PYTHONPATH=/workspaces/spark/build/sparkd-debug-clang/src/lib_python_interop;/workspaces/spark/src/lib_python_interop/python_interop_plugins`