Mercurial > hg > orthanc-stone
comparison Framework/Toolbox/ObserversRegistry.h @ 0:351ab0da0150
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 14 Oct 2016 15:34:11 +0200 |
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children | ff1e935768e7 |
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1 /** | |
2 * Stone of Orthanc | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
5 * | |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
10 * | |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
22 * | |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
33 #pragma once | |
34 | |
35 #include "../Orthanc/Core/OrthancException.h" | |
36 | |
37 #include <boost/noncopyable.hpp> | |
38 #include <boost/thread/mutex.hpp> | |
39 #include <set> | |
40 | |
41 namespace OrthancStone | |
42 { | |
43 template < | |
44 typename Source, | |
45 typename Observer = typename Source::IChangeObserver | |
46 > | |
47 class ObserversRegistry : public boost::noncopyable | |
48 { | |
49 private: | |
50 struct ChangeFunctor : public boost::noncopyable | |
51 { | |
52 void operator() (Observer& observer, | |
53 const Source& source) | |
54 { | |
55 observer.NotifyChange(source); | |
56 } | |
57 }; | |
58 | |
59 typedef std::set<Observer*> Observers; | |
60 | |
61 boost::mutex mutex_; | |
62 Observers observers_; | |
63 bool empty_; | |
64 | |
65 public: | |
66 ObserversRegistry() : empty_(true) | |
67 { | |
68 } | |
69 | |
70 template <typename Functor> | |
71 void Notify(const Source* source, | |
72 Functor& functor) | |
73 { | |
74 if (empty_) | |
75 { | |
76 // Optimization to avoid the unnecessary locking of the mutex | |
77 return; | |
78 } | |
79 | |
80 if (source == NULL) | |
81 { | |
82 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange); | |
83 } | |
84 | |
85 boost::mutex::scoped_lock lock(mutex_); | |
86 | |
87 for (typename Observers::const_iterator observer = observers_.begin(); | |
88 observer != observers_.end(); ++observer) | |
89 { | |
90 functor(**observer, *source); | |
91 } | |
92 } | |
93 | |
94 template <typename Functor> | |
95 void Notify(const Source* source) | |
96 { | |
97 // Use the default functor | |
98 Functor functor; | |
99 Notify(source, functor); | |
100 } | |
101 | |
102 void NotifyChange(const Source* source) | |
103 { | |
104 Notify<ChangeFunctor>(source); | |
105 } | |
106 | |
107 void Register(Observer& observer) | |
108 { | |
109 empty_ = false; | |
110 | |
111 boost::mutex::scoped_lock lock(mutex_); | |
112 observers_.insert(&observer); | |
113 } | |
114 | |
115 void Unregister(Observer& observer) | |
116 { | |
117 boost::mutex::scoped_lock lock(mutex_); | |
118 observers_.erase(&observer); | |
119 | |
120 if (observers_.empty()) | |
121 { | |
122 empty_ = true; | |
123 } | |
124 } | |
125 | |
126 bool IsEmpty() | |
127 { | |
128 #if 0 | |
129 boost::mutex::scoped_lock lock(mutex_); | |
130 return observers_.empty(); | |
131 #else | |
132 return empty_; | |
133 #endif | |
134 } | |
135 }; | |
136 } |