2 Copyright (C) 2018-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 #ifndef DCPOMATIC_CHANGE_SIGNALLER_H
23 #define DCPOMATIC_CHANGE_SIGNALLER_H
26 #include <boost/thread.hpp>
38 template <class T, class P>
42 ChangeSignal(T* thing_, P property_, ChangeType type_)
54 class ChangeSignalDespatcherBase
57 static boost::mutex _instance_mutex;
61 template <class T, class P>
62 class ChangeSignalDespatcher : public ChangeSignalDespatcherBase
65 ChangeSignalDespatcher() = default;
67 ChangeSignalDespatcher(ChangeSignalDespatcher const&) = delete;
68 ChangeSignalDespatcher& operator=(ChangeSignalDespatcher const&) = delete;
70 void signal_change(ChangeSignal<T, P> const& signal)
73 boost::mutex::scoped_lock lm(_mutex);
74 _pending.push_back(signal);
76 signal.thing->signal_change(signal.type, signal.property);
82 boost::mutex::scoped_lock lm(_mutex);
88 boost::mutex::scoped_lock lm(_mutex);
89 auto pending = _pending;
92 for (auto signal: pending) {
93 signal.thing->signal_change(signal.type, signal.property);
101 static ChangeSignalDespatcher* instance()
103 static boost::mutex _instance_mutex;
104 static boost::mutex::scoped_lock lm(_instance_mutex);
105 static ChangeSignalDespatcher<T, P>* _instance;
107 _instance = new ChangeSignalDespatcher<T, P>();
113 std::vector<ChangeSignal<T, P>> _pending;
114 bool _suspended = false;
119 template <class T, class P>
120 class ChangeSignaller
123 ChangeSignaller (T* t, P p)
128 ChangeSignalDespatcher<T, P>::instance()->signal_change({_thing, _property, ChangeType::PENDING});
133 ChangeSignalDespatcher<T, P>::instance()->signal_change({_thing, _property, _done ? ChangeType::DONE : ChangeType::CANCELLED});