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/**
* Circular buffer (double linked, threadsafe)
*
* Used to store recent readings and buffer in case of net inconnectivity
*
* @author Steffen Vogel <info@steffenvogel.de>
* @copyright Copyright (c) 2011 - 2023, The volkszaehler.org project
* @package vzlogger
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*/
/*
* This file is part of volkzaehler.org
*
* volkzaehler.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* volkzaehler.org 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with volkszaehler.org. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _BUFFER_H_
#define _BUFFER_H_
#include <list>
#include <pthread.h>
#include <sys/time.h>
#include <Reading.hpp>
class Buffer {
public:
typedef vz::shared_ptr<Buffer> Ptr;
typedef std::list<Reading>::iterator iterator;
typedef std::list<Reading>::const_iterator const_iterator;
enum aggmode { NONE, MAX, AVG, SUM };
Buffer();
virtual ~Buffer();
void aggregate(int aggtime, bool aggFixedInterval);
void push(const Reading &rd);
void clean(bool deleted_only = true);
void undelete();
void shrink(/*size_t keep = 0*/);
std::string dump();
inline iterator begin() { return _sent.begin(); }
inline iterator end() { return _sent.end(); }
inline size_t size() {
lock();
size_t s = _sent.size();
unlock();
return s;
}
inline bool newValues() const { return _newValues; }
inline void clear_newValues() { _newValues = false; }
inline void lock() { pthread_mutex_lock(&_mutex); }
inline void unlock() { pthread_mutex_unlock(&_mutex); }
inline void wait(pthread_cond_t *condition) { pthread_cond_wait(condition, &_mutex); }
inline void have_newValues() { _newValues = true; }
inline void set_aggmode(Buffer::aggmode m) { _aggmode = m; }
inline aggmode get_aggmode() const { return _aggmode; }
private:
Buffer(const Buffer &); // don't allow copy constructor
Buffer &operator=(const Buffer &); // and no assignment op.
std::list<Reading> _sent;
bool _newValues;
Buffer::aggmode _aggmode;
size_t _keep; /**< number of readings to cache for local interface */
pthread_mutex_t _mutex;
Reading
*_last_avg; // keeps value and time from last reading from aggregate call for aggmode AVG
};
#endif /* _BUFFER_H_ */
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