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/*
Copyright (C) 2017-2019 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 optional<float>();
}
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 ();
}
}
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