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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/>.
*/
#include "event_history.h"
#include "util.h"
#include <boost/thread/mutex.hpp>
using boost::optional;
EventHistory::EventHistory(int size)
: _size(size)
{
}
optional<float>
EventHistory::rate() const
{
boost::mutex::scoped_lock lock(_mutex);
if (int(_history.size()) < _size) {
return {};
}
struct timeval now;
gettimeofday(&now, 0);
return _size / (seconds(now) - seconds(_history.back()));
}
void
EventHistory::event()
{
boost::mutex::scoped_lock lock(_mutex);
struct timeval tv;
gettimeofday(&tv, 0);
_history.push_front(tv);
if (int(_history.size()) > _size) {
_history.pop_back();
}
++_events;
}
int
EventHistory::events() const
{
boost::mutex::scoped_lock lock(_mutex);
return _events;
}
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