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