2 Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/lib/update.h
21 * @brief UpdateChecker class.
24 #include <boost/signals2.hpp>
25 #include <boost/thread/mutex.hpp>
26 #include <boost/thread/condition.hpp>
27 #include <boost/thread.hpp>
28 #include <curl/curl.h>
30 /** Class to check for the existance of an update for DCP-o-matic on a remote server */
40 YES, ///< there is an update
41 FAILED, ///< the check failed, so we don't know
42 NO, ///< there is no update
43 NOT_RUN ///< the check has not been run (yet)
46 /** @return state of the checker */
48 boost::mutex::scoped_lock lm (_data_mutex);
52 /** @return the version string of the latest stable version (if _state == YES or NO) */
53 std::string stable () {
54 boost::mutex::scoped_lock lm (_data_mutex);
58 /** @return the version string of the latest test version (if _state == YES or NO) */
60 boost::mutex::scoped_lock lm (_data_mutex);
64 /** @return true if the last signal emission was the first */
65 bool last_emit_was_first () const {
66 boost::mutex::scoped_lock lm (_data_mutex);
70 size_t write_callback (void *, size_t, size_t);
72 boost::signals2::signal<void (void)> StateChanged;
74 static UpdateChecker* instance ();
77 static UpdateChecker* _instance;
79 void set_state (State);
86 /** mutex to protect _state, _stable, _test and _emits */
87 mutable boost::mutex _data_mutex;
93 boost::thread* _thread;
94 boost::mutex _process_mutex;
95 boost::condition _condition;