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/*
Copyright (C) 2017-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic 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 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DCPOMATIC_EVENT_HISTORY_H
#define DCPOMATIC_EVENT_HISTORY_H
#include <boost/optional.hpp>
#include <boost/thread/mutex.hpp>
#include <list>
class EventHistory
{
public:
explicit EventHistory(int size);
boost::optional<float> rate() const;
void event();
int events() const;
private:
/** Mutex for _history and _events */
mutable boost::mutex _mutex;
/** List of the times of the last _history_size events
first is the most recently completed.
*/
std::list<struct timeval> _history;
int _events = 0;
/** Number of events that we should keep history for */
int const _size;
};
#endif
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