IQueue.h

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/* Copyright 2013-2019 Homegear GmbH
 *
 * libhomegear-base is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * libhomegear-base is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with libhomegear-base.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU Lesser General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
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*/

#ifndef IQUEUE_H_
#define IQUEUE_H_

#include "IQueueBase.h"

#include <vector>

namespace BaseLib {
class SharedObjects;

class IQueueEntry {
 public:
  IQueueEntry() = default;
  virtual ~IQueueEntry() = default;

  int64_t time = 0;
};

class IQueue : public IQueueBase {
 public:
  IQueue(SharedObjects *baseLib, uint32_t queueCount, uint32_t bufferSize);
  virtual ~IQueue();

  void startQueue(int32_t index, bool waitWhenFull, uint32_t processingThreadCount, int32_t threadPriority = 0, int32_t threadPolicy = SCHED_OTHER);

  void startQueue(int32_t index, bool waitWhenFull, uint32_t initialProcessingThreadCount, uint32_t maxProcessingThreadCount);

  void stopQueue(int32_t index);

  bool queueIsStarted(int32_t index);

  bool addThread(int32_t index);

  bool enqueue(int32_t index, std::shared_ptr<IQueueEntry> &entry, bool waitWhenFull = false);

  virtual void processQueueEntry(int32_t index, std::shared_ptr<IQueueEntry> &entry) = 0;

  bool queueEmpty(int32_t index);

  uint32_t processingThreadCount(int32_t index);

  uint32_t maxProcessingThreadCount(int32_t index);

  int32_t queueSize(int32_t index);

  double threadLoad(int32_t index);
  double maxThreadLoad(int32_t index);
  double maxThreadLoad1m(int32_t index);
  double maxThreadLoad10m(int32_t index);
  double maxThreadLoad1h(int32_t index);
  int64_t maxWait(int32_t index);
  int64_t maxWait1m(int32_t index);
  int64_t maxWait10m(int32_t index);
  int64_t maxWait1h(int32_t index);
 private:
  std::mutex _addThreadMutex;
  int32_t _bufferSize = 10000;
  std::vector<int32_t> _bufferHead;
  std::vector<int32_t> _bufferTail;
  std::vector<int32_t> _bufferCount;
  std::vector<bool> _waitWhenFull;
  std::vector<std::vector<std::shared_ptr<IQueueEntry>>> _buffer;
  std::unique_ptr<std::mutex[]> _queueMutex = nullptr;
  std::vector<std::vector<std::shared_ptr<std::thread>>> _processingThread;
  std::unique_ptr<std::condition_variable[]> _produceConditionVariable = nullptr;
  std::unique_ptr<std::condition_variable[]> _processingConditionVariable = nullptr;

  std::unique_ptr<std::atomic<uint32_t>[]> _threadsInUse;

  std::unique_ptr<std::atomic<double>[]> _maxThreadLoad1mCurrent;
  std::unique_ptr<std::atomic<double>[]> _maxThreadLoad1m;
  std::unique_ptr<std::atomic<int64_t>[]> _maxWait1mCurrent;
  std::unique_ptr<std::atomic<int64_t>[]> _maxWait1m;
  std::unique_ptr<std::atomic<int64_t>[]> _last1mCycle;

  std::unique_ptr<std::atomic<double>[]> _maxThreadLoad10mCurrent;
  std::unique_ptr<std::atomic<double>[]> _maxThreadLoad10m;
  std::unique_ptr<std::atomic<int64_t>[]> _maxWait10mCurrent;
  std::unique_ptr<std::atomic<int64_t>[]> _maxWait10m;
  std::unique_ptr<std::atomic<int64_t>[]> _last10mCycle;

  std::unique_ptr<std::atomic<double>[]> _maxThreadLoad1hCurrent;
  std::unique_ptr<std::atomic<double>[]> _maxThreadLoad1h;
  std::unique_ptr<std::atomic<int64_t>[]> _maxWait1hCurrent;
  std::unique_ptr<std::atomic<int64_t>[]> _maxWait1h;
  std::unique_ptr<std::atomic<int64_t>[]> _last1hCycle;

  std::unique_ptr<std::atomic<double>[]> _maxThreadLoad;
  std::unique_ptr<std::atomic<int64_t>[]> _maxWait;

  void process(int32_t index);
};

}
#endif