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120 lines
2.3 KiB
C++
120 lines
2.3 KiB
C++
/* Icinga 2 | (c) 2022 Icinga GmbH | GPLv2+ */
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#ifndef BULKER_H
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#define BULKER_H
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#include <boost/config.hpp>
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#include <chrono>
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#include <condition_variable>
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#include <mutex>
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#include <queue>
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#include <utility>
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#include <vector>
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namespace icinga
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{
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/**
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* A queue which outputs the input as bulks of a defined size
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* or after a defined time, whichever is reached first
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*
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* @ingroup base
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*/
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template<class T>
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class Bulker
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{
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private:
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typedef std::chrono::steady_clock Clock;
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public:
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typedef std::vector<T> Container;
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typedef typename Container::size_type SizeType;
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typedef typename Clock::duration Duration;
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Bulker(SizeType bulkSize, Duration threshold)
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: m_BulkSize(bulkSize), m_Threshold(threshold), m_NextConsumption(NullTimePoint()) { }
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void ProduceOne(T needle);
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Container ConsumeMany();
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SizeType Size();
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inline SizeType GetBulkSize() const noexcept
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{
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return m_BulkSize;
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}
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private:
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typedef std::chrono::time_point<Clock> TimePoint;
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static inline
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TimePoint NullTimePoint()
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{
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return TimePoint::min();
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}
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inline void UpdateNextConsumption()
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{
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m_NextConsumption = Clock::now() + m_Threshold;
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}
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const SizeType m_BulkSize;
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const Duration m_Threshold;
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std::mutex m_Mutex;
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std::condition_variable m_CV;
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std::queue<Container> m_Bulks;
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TimePoint m_NextConsumption;
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};
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template<class T>
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void Bulker<T>::ProduceOne(T needle)
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{
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std::unique_lock<std::mutex> lock (m_Mutex);
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if (m_Bulks.empty() || m_Bulks.back().size() == m_BulkSize) {
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m_Bulks.emplace();
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}
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m_Bulks.back().emplace_back(std::move(needle));
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if (m_Bulks.size() == 1u && m_Bulks.back().size() == m_BulkSize) {
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m_CV.notify_one();
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}
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}
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template<class T>
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typename Bulker<T>::Container Bulker<T>::ConsumeMany()
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{
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std::unique_lock<std::mutex> lock (m_Mutex);
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if (BOOST_UNLIKELY(m_NextConsumption == NullTimePoint())) {
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UpdateNextConsumption();
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}
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auto deadline (m_NextConsumption);
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m_CV.wait_until(lock, deadline, [this]() { return !m_Bulks.empty() && m_Bulks.front().size() == m_BulkSize; });
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UpdateNextConsumption();
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if (m_Bulks.empty()) {
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return Container();
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}
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auto haystack (std::move(m_Bulks.front()));
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m_Bulks.pop();
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return haystack;
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}
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template<class T>
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typename Bulker<T>::SizeType Bulker<T>::Size()
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{
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std::unique_lock<std::mutex> lock (m_Mutex);
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return m_Bulks.empty() ? 0 : (m_Bulks.size() - 1u) * m_BulkSize + m_Bulks.back().size();
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}
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}
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#endif /* BULKER_H */
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