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annotate Framework/Messages/ICallable.h @ 982:3f6e5a38c88f toa2019090601

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Merge
author Benjamin Golinvaux <bgo@osimis.io>
date Fri, 06 Sep 2019 09:39:18 +0200
parents c20dbaab360c 18d53a8b41b7
children e713f1a99861 ca2058bd74ef
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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 * Copyright (C) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #pragma once
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23
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24 #include "IMessage.h"
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25
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26 #include <Core/Logging.h>
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27
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28 #include <boost/noncopyable.hpp>
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29
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30 #include <string>
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31
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32 namespace OrthancStone {
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33
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34 class IObserver;
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35
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36 // This is referencing an object and member function that can be notified
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37 // by an IObservable. The object must derive from IO
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38 // The member functions must be of type "void Function(const IMessage& message)" or reference a derived class of IMessage
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39 class ICallable : public boost::noncopyable
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40 {
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41 public:
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42 virtual ~ICallable()
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43 {
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44 }
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45
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46 virtual void Apply(const IMessage& message) = 0;
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47
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48 virtual const MessageIdentifier& GetMessageIdentifier() = 0;
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49
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50 virtual IObserver* GetObserver() const = 0;
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51 };
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52
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53 template <typename TMessage>
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54 class MessageHandler: public ICallable
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55 {
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56 };
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57
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58
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59 template <typename TObserver,
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60 typename TMessage>
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61 class Callable : public MessageHandler<TMessage>
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62 {
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63 private:
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64 typedef void (TObserver::* MemberFunction) (const TMessage&);
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65
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66 TObserver& observer_;
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67 MemberFunction function_;
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68 std::string observerFingerprint_;
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69
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70 public:
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71 Callable(TObserver& observer,
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72 MemberFunction function) :
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73 observer_(observer),
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74 function_(function),
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75 observerFingerprint_(observer.GetFingerprint())
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76 {
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77 }
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78
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79 void ApplyInternal(const TMessage& message)
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80 {
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81 std::string currentFingerprint(observer_.GetFingerprint());
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82 if (observerFingerprint_ != currentFingerprint)
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83 {
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84 LOG(TRACE) << "The observer at address " <<
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85 std::hex << &observer_ << std::dec <<
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86 ") has a different fingerprint than the one recorded at callback " <<
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87 "registration time. This means that it is not the same object as " <<
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88 "the one recorded, even though their addresses are the same. " <<
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89 "Callback will NOT be sent!";
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90 LOG(TRACE) << " recorded fingerprint = " << observerFingerprint_ <<
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91 " current fingerprint = " << currentFingerprint;
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92 }
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93 else
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94 {
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95 LOG(TRACE) << "The recorded fingerprint is " << observerFingerprint_
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96 << " and the current fingerprint is " << currentFingerprint
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97 << " -- callable will be called.";
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98 (observer_.*function_) (message);
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99 }
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100 }
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101
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102 virtual void Apply(const IMessage& message)
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103 {
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104 ApplyInternal(dynamic_cast<const TMessage&>(message));
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105 }
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106
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107 virtual const MessageIdentifier& GetMessageIdentifier()
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108 {
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109 return TMessage::GetStaticIdentifier();
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110 }
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111
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112 virtual IObserver* GetObserver() const
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113 {
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114 return &observer_;
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115 }
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116 };
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117
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118 #if 0 /* __cplusplus >= 201103L*/
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119
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120 #include <functional>
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121
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122 template <typename TMessage>
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123 class LambdaCallable : public MessageHandler<TMessage>
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124 {
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125 private:
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126
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127 IObserver& observer_;
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128 std::function<void (const TMessage&)> lambda_;
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129
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130 public:
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131 LambdaCallable(IObserver& observer,
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132 std::function<void (const TMessage&)> lambdaFunction) :
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133 observer_(observer),
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134 lambda_(lambdaFunction)
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135 {
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136 }
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137
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138 virtual void Apply(const IMessage& message)
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139 {
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140 lambda_(dynamic_cast<const TMessage&>(message));
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141 }
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142
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143 virtual IObserver* GetObserver() const
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144 {
b70fcc134ba4 moved LambdaCallable (currently still disable because it does not work in WASM)
Alain Mazy <alain@mazy.be>
parents: 439
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145 return &observer_;
b70fcc134ba4 moved LambdaCallable (currently still disable because it does not work in WASM)
Alain Mazy <alain@mazy.be>
parents: 439
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146 }
b70fcc134ba4 moved LambdaCallable (currently still disable because it does not work in WASM)
Alain Mazy <alain@mazy.be>
parents: 439
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147 };
b70fcc134ba4 moved LambdaCallable (currently still disable because it does not work in WASM)
Alain Mazy <alain@mazy.be>
parents: 439
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148 #endif //__cplusplus >= 201103L
299
3897f9f28cfa backup work in progress: updated messaging framework with ICallable
am@osimis.io
parents:
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149 }