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/*
Copyright (C) 2018 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/>.
*/
/** @file src/lib/checker.h
* @brief Checker class.
*/
#ifndef DCPOMATIC_CHECKER_H
#define DCPOMATIC_CHECKER_H
#include "signaller.h"
#include <boost/signals2.hpp>
/** Parent for classes which check some condition every so often and signal
* when the state of the condition changes.
*/
class Checker : public Signaller, public boost::noncopyable
{
public:
virtual ~Checker ();
void run ();
bool ok () const;
/** Emitted when the state of our condition changes */
boost::signals2::signal<void (void)> StateChanged;
protected:
Checker (int period);
/** @return true if the condition is `ok', otherwise false */
virtual bool check () const = 0;
private:
void thread ();
boost::thread* _thread;
mutable boost::mutex _mutex;
bool _terminate;
bool _ok;
/** check period in seconds */
int _period;
};
#endif
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