85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
#ifndef INCLUDE_CCAPI_CPP_CCAPI_QUEUE_H_
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#define INCLUDE_CCAPI_CPP_CCAPI_QUEUE_H_
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#include <mutex>
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#include <queue>
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#include <vector>
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#include "ccapi_cpp/ccapi_logger.h"
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namespace ccapi {
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template <class T>
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/**
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* This class represents a generic FIFO queue.
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*/
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class Queue {
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public:
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std::string EXCEPTION_QUEUE_FULL = "queue is full";
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std::string EXCEPTION_QUEUE_EMPTY = "queue is empty";
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explicit Queue(const size_t maxSize = 0) : maxSize(maxSize) {}
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void pushBack(T&& t) {
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#ifndef CCAPI_USE_SINGLE_THREAD
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std::lock_guard<std::mutex> lock(this->m);
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#endif
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if (this->maxSize <= 0 || this->queue.size() < this->maxSize) {
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CCAPI_LOGGER_TRACE("this->queue.size() = " + size_tToString(this->queue.size()));
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this->queue.push_back(t);
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} else {
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throw std::runtime_error(EXCEPTION_QUEUE_FULL);
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}
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}
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T popBack() {
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#ifndef CCAPI_USE_SINGLE_THREAD
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std::lock_guard<std::mutex> lock(this->m);
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#endif
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if (this->queue.empty()) {
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throw std::runtime_error(EXCEPTION_QUEUE_EMPTY);
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} else {
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T t = std::move(this->queue.back());
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this->queue.pop_back();
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return t;
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}
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}
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std::vector<T> purge() {
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#ifndef CCAPI_USE_SINGLE_THREAD
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std::lock_guard<std::mutex> lock(this->m);
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#endif
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std::vector<T> p;
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std::swap(p, this->queue);
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return p;
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}
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void removeAll(std::vector<T>& c) {
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#ifndef CCAPI_USE_SINGLE_THREAD
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std::lock_guard<std::mutex> lock(this->m);
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#endif
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if (c.empty()) {
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c = std::move(this->queue);
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} else {
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c.reserve(c.size() + this->queue.size());
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std::move(std::begin(this->queue), std::end(this->queue), std::back_inserter(c));
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}
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this->queue.clear();
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}
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size_t size() const {
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#ifndef CCAPI_USE_SINGLE_THREAD
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std::lock_guard<std::mutex> lock(this->m);
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#endif
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return this->queue.size();
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}
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bool empty() const {
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#ifndef CCAPI_USE_SINGLE_THREAD
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std::lock_guard<std::mutex> lock(this->m);
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#endif
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return this->queue.empty();
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}
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#ifndef CCAPI_EXPOSE_INTERNAL
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private:
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#endif
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std::vector<T> queue;
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#ifndef CCAPI_USE_SINGLE_THREAD
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mutable std::mutex m;
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#endif
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size_t maxSize{};
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};
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} /* namespace ccapi */
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#endif // INCLUDE_CCAPI_CPP_CCAPI_QUEUE_H_
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