Mercurial > hg > orthanc-stone
annotate Framework/Toolbox/ObserversRegistry.h @ 47:28956ed68280
agpl license
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Thu, 27 Apr 2017 11:00:15 +0200 |
| parents | 7207a407bcd8 |
| children | c2dc924f1a63 4cff7b1ed31d |
| rev | line source |
|---|---|
| 0 | 1 /** |
| 2 * Stone of Orthanc | |
| 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
| 4 * Department, University Hospital of Liege, Belgium | |
|
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7207a407bcd8
shared copyright with osimis
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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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 | |
| 47 | 8 * modify it under the terms of the GNU Affero General Public License |
| 9 * as published by the Free Software Foundation, either version 3 of | |
| 10 * the License, or (at your option) any later version. | |
| 0 | 11 * |
| 12 * This program is distributed in the hope that it will be useful, but | |
| 13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 47 | 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 * Affero General Public License for more details. | |
| 16 * | |
| 17 * You should have received a copy of the GNU Affero General Public License | |
| 0 | 18 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 **/ | |
| 20 | |
| 21 | |
| 22 #pragma once | |
| 23 | |
| 16 | 24 #include "../../Resources/Orthanc/Core/OrthancException.h" |
| 0 | 25 |
| 26 #include <boost/noncopyable.hpp> | |
| 27 #include <boost/thread/mutex.hpp> | |
| 28 #include <set> | |
| 29 | |
| 30 namespace OrthancStone | |
| 31 { | |
| 32 template < | |
| 33 typename Source, | |
| 34 typename Observer = typename Source::IChangeObserver | |
| 35 > | |
| 36 class ObserversRegistry : public boost::noncopyable | |
| 37 { | |
| 38 private: | |
| 39 struct ChangeFunctor : public boost::noncopyable | |
| 40 { | |
| 41 void operator() (Observer& observer, | |
| 42 const Source& source) | |
| 43 { | |
| 44 observer.NotifyChange(source); | |
| 45 } | |
| 46 }; | |
| 47 | |
| 48 typedef std::set<Observer*> Observers; | |
| 49 | |
| 50 boost::mutex mutex_; | |
| 51 Observers observers_; | |
| 52 bool empty_; | |
| 53 | |
| 54 public: | |
| 55 ObserversRegistry() : empty_(true) | |
| 56 { | |
| 57 } | |
| 58 | |
| 59 template <typename Functor> | |
| 60 void Notify(const Source* source, | |
| 61 Functor& functor) | |
| 62 { | |
| 63 if (empty_) | |
| 64 { | |
| 65 // Optimization to avoid the unnecessary locking of the mutex | |
| 66 return; | |
| 67 } | |
| 68 | |
| 69 if (source == NULL) | |
| 70 { | |
| 71 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange); | |
| 72 } | |
| 73 | |
| 74 boost::mutex::scoped_lock lock(mutex_); | |
| 75 | |
| 76 for (typename Observers::const_iterator observer = observers_.begin(); | |
| 77 observer != observers_.end(); ++observer) | |
| 78 { | |
| 79 functor(**observer, *source); | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 template <typename Functor> | |
| 84 void Notify(const Source* source) | |
| 85 { | |
| 86 // Use the default functor | |
| 87 Functor functor; | |
| 88 Notify(source, functor); | |
| 89 } | |
| 90 | |
| 91 void NotifyChange(const Source* source) | |
| 92 { | |
| 93 Notify<ChangeFunctor>(source); | |
| 94 } | |
| 95 | |
| 96 void Register(Observer& observer) | |
| 97 { | |
| 98 empty_ = false; | |
| 99 | |
| 100 boost::mutex::scoped_lock lock(mutex_); | |
| 101 observers_.insert(&observer); | |
| 102 } | |
| 103 | |
| 104 void Unregister(Observer& observer) | |
| 105 { | |
| 106 boost::mutex::scoped_lock lock(mutex_); | |
| 107 observers_.erase(&observer); | |
| 108 | |
| 109 if (observers_.empty()) | |
| 110 { | |
| 111 empty_ = true; | |
| 112 } | |
| 113 } | |
| 114 | |
| 115 bool IsEmpty() | |
| 116 { | |
| 117 #if 0 | |
| 118 boost::mutex::scoped_lock lock(mutex_); | |
| 119 return observers_.empty(); | |
| 120 #else | |
| 121 return empty_; | |
| 122 #endif | |
| 123 } | |
| 124 }; | |
| 125 } |