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/*
Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <boost/signals2.hpp>
#include <boost/thread/mutex.hpp>
#include <curl/curl.h>
class UpdateChecker
{
public:
UpdateChecker ();
~UpdateChecker ();
void run (bool);
enum State {
YES,
FAILED,
NO,
NOT_RUN
};
State state () {
boost::mutex::scoped_lock lm (_data_mutex);
return _state;
}
std::string stable () {
boost::mutex::scoped_lock lm (_data_mutex);
return _stable;
}
/** @return true if this check was run at startup, otherwise false */
bool startup () const {
boost::mutex::scoped_lock lm (_data_mutex);
return _startup;
}
size_t write_callback (void *, size_t, size_t);
boost::signals2::signal<void (void)> StateChanged;
static UpdateChecker* instance ();
private:
static UpdateChecker* _instance;
void set_state (State);
char* _buffer;
int _offset;
CURL* _curl;
/** mutex to protect _state, _stable and _startup */
mutable boost::mutex _data_mutex;
State _state;
std::string _stable;
/** true if this check was run at startup, otherwise false */
bool _startup;
/** mutex to ensure that only one query runs at once */
boost::mutex _single_thread_mutex;
};
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