Mercurial > hg > orthanc-stone
annotate Framework/Toolbox/ObserversRegistry.h @ 42:81e2651dca17
sync
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 14 Apr 2017 12:03:25 +0200 |
parents | 7207a407bcd8 |
children | 28956ed68280 |
rev | line source |
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0 | 1 /** |
2 * Stone of Orthanc | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
40
7207a407bcd8
shared copyright with osimis
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
16
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changeset
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5 * Copyright (C) 2017 Osimis, Belgium |
0 | 6 * |
7 * This program is free software: you can redistribute it and/or | |
8 * modify it under the terms of the GNU General Public License as | |
9 * published by the Free Software Foundation, either version 3 of the | |
10 * License, or (at your option) any later version. | |
11 * | |
12 * In addition, as a special exception, the copyright holders of this | |
13 * program give permission to link the code of its release with the | |
14 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
15 * that use the same license as the "OpenSSL" library), and distribute | |
16 * the linked executables. You must obey the GNU General Public License | |
17 * in all respects for all of the code used other than "OpenSSL". If you | |
18 * modify file(s) with this exception, you may extend this exception to | |
19 * your version of the file(s), but you are not obligated to do so. If | |
20 * you do not wish to do so, delete this exception statement from your | |
21 * version. If you delete this exception statement from all source files | |
22 * in the program, then also delete it here. | |
23 * | |
24 * This program is distributed in the hope that it will be useful, but | |
25 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
27 * General Public License for more details. | |
28 * | |
29 * You should have received a copy of the GNU General Public License | |
30 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
31 **/ | |
32 | |
33 | |
34 #pragma once | |
35 | |
16 | 36 #include "../../Resources/Orthanc/Core/OrthancException.h" |
0 | 37 |
38 #include <boost/noncopyable.hpp> | |
39 #include <boost/thread/mutex.hpp> | |
40 #include <set> | |
41 | |
42 namespace OrthancStone | |
43 { | |
44 template < | |
45 typename Source, | |
46 typename Observer = typename Source::IChangeObserver | |
47 > | |
48 class ObserversRegistry : public boost::noncopyable | |
49 { | |
50 private: | |
51 struct ChangeFunctor : public boost::noncopyable | |
52 { | |
53 void operator() (Observer& observer, | |
54 const Source& source) | |
55 { | |
56 observer.NotifyChange(source); | |
57 } | |
58 }; | |
59 | |
60 typedef std::set<Observer*> Observers; | |
61 | |
62 boost::mutex mutex_; | |
63 Observers observers_; | |
64 bool empty_; | |
65 | |
66 public: | |
67 ObserversRegistry() : empty_(true) | |
68 { | |
69 } | |
70 | |
71 template <typename Functor> | |
72 void Notify(const Source* source, | |
73 Functor& functor) | |
74 { | |
75 if (empty_) | |
76 { | |
77 // Optimization to avoid the unnecessary locking of the mutex | |
78 return; | |
79 } | |
80 | |
81 if (source == NULL) | |
82 { | |
83 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange); | |
84 } | |
85 | |
86 boost::mutex::scoped_lock lock(mutex_); | |
87 | |
88 for (typename Observers::const_iterator observer = observers_.begin(); | |
89 observer != observers_.end(); ++observer) | |
90 { | |
91 functor(**observer, *source); | |
92 } | |
93 } | |
94 | |
95 template <typename Functor> | |
96 void Notify(const Source* source) | |
97 { | |
98 // Use the default functor | |
99 Functor functor; | |
100 Notify(source, functor); | |
101 } | |
102 | |
103 void NotifyChange(const Source* source) | |
104 { | |
105 Notify<ChangeFunctor>(source); | |
106 } | |
107 | |
108 void Register(Observer& observer) | |
109 { | |
110 empty_ = false; | |
111 | |
112 boost::mutex::scoped_lock lock(mutex_); | |
113 observers_.insert(&observer); | |
114 } | |
115 | |
116 void Unregister(Observer& observer) | |
117 { | |
118 boost::mutex::scoped_lock lock(mutex_); | |
119 observers_.erase(&observer); | |
120 | |
121 if (observers_.empty()) | |
122 { | |
123 empty_ = true; | |
124 } | |
125 } | |
126 | |
127 bool IsEmpty() | |
128 { | |
129 #if 0 | |
130 boost::mutex::scoped_lock lock(mutex_); | |
131 return observers_.empty(); | |
132 #else | |
133 return empty_; | |
134 #endif | |
135 } | |
136 }; | |
137 } |