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annotate UnitTestsSources/TestMessageBroker2.cpp @ 299:3897f9f28cfa am-callable-and-promise

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backup work in progress: updated messaging framework with ICallable
author am@osimis.io
date Fri, 14 Sep 2018 16:44:01 +0200
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children b4abaeb783b1
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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) 2017-2018 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 #include "gtest/gtest.h"
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23
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24 #include "Framework/Messages/MessageBroker.h"
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25
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26 #include <boost/noncopyable.hpp>
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27 #include <boost/function.hpp>
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28 #include <boost/bind.hpp>
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29
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30 #include <string>
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31 #include <map>
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32 #include <set>
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33
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34 int testCounter = 0;
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35 namespace {
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36
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37 class IObserver;
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38 class IObservable;
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39 class Promise;
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40
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41 enum MessageType
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42 {
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43 MessageType_Test1,
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44 MessageType_Test2,
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45
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46 MessageType_CustomMessage,
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47 MessageType_LastGenericStoneMessage
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48 };
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49
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50 struct IMessage : public boost::noncopyable
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51 {
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52 MessageType messageType_;
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53 public:
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54 IMessage(const MessageType& messageType)
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55 : messageType_(messageType)
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56 {}
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57 virtual ~IMessage() {}
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58
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59 virtual int GetType() const {return messageType_;}
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60 };
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61
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62
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63 struct ICustomMessage : public IMessage
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64 {
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65 int customMessageType_;
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66 public:
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67 ICustomMessage(int customMessageType)
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68 : IMessage(MessageType_CustomMessage),
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69 customMessageType_(customMessageType)
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70 {}
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71 virtual ~ICustomMessage() {}
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72
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73 virtual int GetType() const {return customMessageType_;}
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74 };
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75
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76
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77 // This is referencing an object and member function that can be notified
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78 // by an IObservable. The object must derive from IO
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79 // The member functions must be of type "void Function(const IMessage& message)" or reference a derived class of IMessage
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80 class ICallable : public boost::noncopyable
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81 {
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82 public:
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83 virtual ~ICallable()
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84 {
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85 }
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86
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87 virtual void Apply(const IMessage& message) = 0;
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88
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89 virtual MessageType GetMessageType() const = 0;
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90 virtual IObserver* GetObserver() const = 0;
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91 };
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92
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93 template <typename TObserver,
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94 typename TMessage>
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95 class Callable : public ICallable
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96 {
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97 private:
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98 typedef void (TObserver::* MemberFunction) (const TMessage&);
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99
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100 TObserver& observer_;
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101 MemberFunction function_;
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102
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103 public:
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104 Callable(TObserver& observer,
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105 MemberFunction function) :
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106 observer_(observer),
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107 function_(function)
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108 {
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109 }
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110
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111 void ApplyInternal(const TMessage& message)
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112 {
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113 (observer_.*function_) (message);
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114 }
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115
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116 virtual void Apply(const IMessage& message)
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117 {
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118 ApplyInternal(dynamic_cast<const TMessage&>(message));
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119 }
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120
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121 virtual MessageType GetMessageType() const
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122 {
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123 return static_cast<MessageType>(TMessage::Type);
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124 }
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125
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126 virtual IObserver* GetObserver() const
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127 {
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128 return &observer_;
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129 }
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130 };
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131
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132
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133
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134
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135 /*
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136 * This is a central message broker. It keeps track of all observers and knows
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137 * when an observer is deleted.
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138 * This way, it can prevent an observable to send a message to a delete observer.
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139 */
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140 class MessageBroker : public boost::noncopyable
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141 {
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142
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143 std::set<IObserver*> activeObservers_; // the list of observers that are currently alive (that have not been deleted)
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144
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145 public:
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146
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147 void Register(IObserver& observer)
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148 {
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149 activeObservers_.insert(&observer);
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150 }
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151
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152 void Unregister(IObserver& observer)
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153 {
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154 activeObservers_.erase(&observer);
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155 }
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156
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157 bool IsActive(IObserver* observer)
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158 {
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159 return activeObservers_.find(observer) != activeObservers_.end();
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160 }
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161 };
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162
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163
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164 class Promise : public boost::noncopyable
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165 {
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166 protected:
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167 MessageBroker& broker_;
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168
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169 ICallable* successCallable_;
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170 ICallable* failureCallable_;
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171
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172 public:
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173 Promise(MessageBroker& broker)
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174 : broker_(broker),
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175 successCallable_(NULL),
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176 failureCallable_(NULL)
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177 {
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178 }
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179
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180 void Success(const IMessage& message)
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181 {
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182 // check the target is still alive in the broker
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183 if (broker_.IsActive(successCallable_->GetObserver()))
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184 {
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185 successCallable_->Apply(message);
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186 }
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187 }
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188
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189 void Failure(const IMessage& message)
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190 {
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191 // check the target is still alive in the broker
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192 if (broker_.IsActive(failureCallable_->GetObserver()))
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193 {
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194 failureCallable_->Apply(message);
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195 }
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196 }
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197
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198 Promise& Then(ICallable* successCallable)
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199 {
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200 if (successCallable_ != NULL)
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201 {
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202 // TODO: throw throw new "Promise may only have a single success target"
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203 }
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204 successCallable_ = successCallable;
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205 return *this;
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206 }
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207
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208 Promise& Else(ICallable* failureCallable)
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209 {
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210 if (failureCallable_ != NULL)
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211 {
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212 // TODO: throw throw new "Promise may only have a single failure target"
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213 }
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214 failureCallable_ = failureCallable;
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215 return *this;
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216 }
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217
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218 };
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219
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220 class IObserver : public boost::noncopyable
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221 {
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222 protected:
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223 MessageBroker& broker_;
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224
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225 public:
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226 IObserver(MessageBroker& broker)
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227 : broker_(broker)
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228 {
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229 broker_.Register(*this);
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230 }
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231
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232 virtual ~IObserver()
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233 {
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234 broker_.Unregister(*this);
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235 }
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236
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237 };
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238
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239
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240 class IObservable : public boost::noncopyable
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241 {
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242 protected:
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243 MessageBroker& broker_;
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244
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245 typedef std::map<int, std::set<ICallable*> > Callables;
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246 Callables callables_;
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247 public:
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248
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249 IObservable(MessageBroker& broker)
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250 : broker_(broker)
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251 {
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252 }
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253
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254 virtual ~IObservable()
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255 {
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256 for (Callables::const_iterator it = callables_.begin();
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257 it != callables_.end(); ++it)
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258 {
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259 for (std::set<ICallable*>::const_iterator
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260 it2 = it->second.begin(); it2 != it->second.end(); ++it2)
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261 {
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262 delete *it2;
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263 }
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264 }
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265 }
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266
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267 void Register(ICallable* callable)
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268 {
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269 MessageType messageType = callable->GetMessageType();
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270
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271 callables_[messageType].insert(callable);
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272 }
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273
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274 void EmitMessage(const IMessage& message)
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275 {
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276 Callables::const_iterator found = callables_.find(message.GetType());
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277
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278 if (found != callables_.end())
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279 {
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280 for (std::set<ICallable*>::const_iterator
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281 it = found->second.begin(); it != found->second.end(); ++it)
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282 {
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283 if (broker_.IsActive((*it)->GetObserver()))
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284 {
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285 (*it)->Apply(message);
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286 }
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287 }
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288 }
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289 }
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290
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291 };
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292
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293
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294 enum CustomMessageType
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295 {
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296 CustomMessageType_First = MessageType_LastGenericStoneMessage + 1,
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297
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298 CustomMessageType_Completed,
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299 CustomMessageType_Increment
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300 };
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301
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302 class MyObservable : public IObservable
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303 {
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304 public:
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305 struct MyCustomMessage: public ICustomMessage
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306 {
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307 int payload_;
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308 enum
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309 {
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310 Type = CustomMessageType_Completed
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311 };
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312
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313 MyCustomMessage(int payload)
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314 : ICustomMessage(Type),
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315 payload_(payload)
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316 {}
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317 };
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318
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319 MyObservable(MessageBroker& broker)
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320 : IObservable(broker)
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321 {}
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322
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323 };
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324
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325 class MyObserver : public IObserver
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326 {
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327 public:
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328 MyObserver(MessageBroker& broker)
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329 : IObserver(broker)
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330 {}
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331
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332 void HandleCompletedMessage(const MyObservable::MyCustomMessage& message)
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333 {
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334 testCounter += message.payload_;
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335 }
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336
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337 };
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338
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339
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340 class MyPromiseSource : public IObservable
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341 {
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342 Promise* currentPromise_;
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343 public:
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344 struct MyPromiseMessage: public ICustomMessage
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345 {
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346 int increment;
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347 enum
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348 {
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349 Type = CustomMessageType_Increment
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350 };
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351
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352 MyPromiseMessage(int increment)
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353 : ICustomMessage(Type),
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354 increment(increment)
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355 {}
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356 };
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357
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358 MyPromiseSource(MessageBroker& broker)
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359 : IObservable(broker),
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360 currentPromise_(NULL)
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361 {}
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362
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363 Promise& StartSomethingAsync()
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364 {
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365 currentPromise_ = new Promise(broker_);
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366 return *currentPromise_;
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367 }
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368
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369 void CompleteSomethingAsyncWithSuccess(int payload)
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370 {
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371 currentPromise_->Success(MyPromiseMessage(payload));
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372 delete currentPromise_;
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373 }
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374
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375 void CompleteSomethingAsyncWithFailure(int payload)
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376 {
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377 currentPromise_->Failure(MyPromiseMessage(payload));
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378 delete currentPromise_;
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379 }
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380 };
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381
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382
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383 class MyPromiseTarget : public IObserver
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384 {
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385 public:
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386 MyPromiseTarget(MessageBroker& broker)
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387 : IObserver(broker)
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388 {}
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389
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390 void IncrementCounter(const MyPromiseSource::MyPromiseMessage& args)
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391 {
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392 testCounter += args.increment;
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393 }
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394
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395 void DecrementCounter(const MyPromiseSource::MyPromiseMessage& args)
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396 {
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397 testCounter -= args.increment;
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398 }
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399 };
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400 }
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401
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402
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403 TEST(MessageBroker2, TestPermanentConnectionSimpleUseCase)
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404 {
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405 MessageBroker broker;
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406 MyObservable observable(broker);
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407 MyObserver observer(broker);
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408
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409 // create a permanent connection between an observable and an observer
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410 observable.Register(new Callable<MyObserver, MyObservable::MyCustomMessage>(observer, &MyObserver::HandleCompletedMessage));
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411
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412 testCounter = 0;
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413 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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414 ASSERT_EQ(12, testCounter);
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415
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416 // the connection is permanent; if we emit the same message again, the observer will be notified again
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417 testCounter = 0;
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418 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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419 ASSERT_EQ(20, testCounter);
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420 }
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421
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422 TEST(MessageBroker2, TestPermanentConnectionDeleteObserver)
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423 {
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424 MessageBroker broker;
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425 MyObservable observable(broker);
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426 MyObserver* observer = new MyObserver(broker);
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427
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428 // create a permanent connection between an observable and an observer
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429 observable.Register(new Callable<MyObserver, MyObservable::MyCustomMessage>(*observer, &MyObserver::HandleCompletedMessage));
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430
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431 testCounter = 0;
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432 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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433 ASSERT_EQ(12, testCounter);
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434
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435 // delete the observer and check that the callback is not called anymore
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436 delete observer;
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437
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438 // the connection is permanent; if we emit the same message again, the observer will be notified again
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439 testCounter = 0;
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440 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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441 ASSERT_EQ(0, testCounter);
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442 }
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443
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444
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445 TEST(MessageBroker2, TestPromiseSuccessFailure)
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446 {
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447 MessageBroker broker;
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448 MyPromiseSource source(broker);
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449 MyPromiseTarget target(broker);
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450
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451 // test a successful promise
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452 source.StartSomethingAsync()
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453 .Then(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(target, &MyPromiseTarget::IncrementCounter))
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454 .Else(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(target, &MyPromiseTarget::DecrementCounter));
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455
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456 testCounter = 0;
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457 source.CompleteSomethingAsyncWithSuccess(10);
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458 ASSERT_EQ(10, testCounter);
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459
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460 // test a failing promise
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461 source.StartSomethingAsync()
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462 .Then(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(target, &MyPromiseTarget::IncrementCounter))
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463 .Else(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(target, &MyPromiseTarget::DecrementCounter));
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464
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465 testCounter = 0;
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466 source.CompleteSomethingAsyncWithFailure(15);
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467 ASSERT_EQ(-15, testCounter);
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468 }
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469
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470 TEST(MessageBroker2, TestPromiseDeleteTarget)
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471 {
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472 MessageBroker broker;
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473 MyPromiseSource source(broker);
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474 MyPromiseTarget* target = new MyPromiseTarget(broker);
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475
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476 // create the promise
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477 source.StartSomethingAsync()
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478 .Then(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(*target, &MyPromiseTarget::IncrementCounter))
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479 .Else(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(*target, &MyPromiseTarget::DecrementCounter));
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480
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481 // delete the promise target
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482 delete target;
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483
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484 // trigger the promise, make sure it does not throw and does not call the callback
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485 testCounter = 0;
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486 source.CompleteSomethingAsyncWithSuccess(10);
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487 ASSERT_EQ(0, testCounter);
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488
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489 // test a failing promise
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490 source.StartSomethingAsync()
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491 .Then(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(*target, &MyPromiseTarget::IncrementCounter))
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492 .Else(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(*target, &MyPromiseTarget::DecrementCounter));
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493
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494 testCounter = 0;
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495 source.CompleteSomethingAsyncWithFailure(15);
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496 ASSERT_EQ(0, testCounter);
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497 }
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498
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499
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500
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501 //#include <stdio.h>
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502 //#include <boost/noncopyable.hpp>
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503
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504 //#include <string>
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505 //#include <memory>
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506 //#include <map>
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507 //#include <set>
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508
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509 //enum MessageType
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510 //{
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511 // MessageType_SeriesDownloaded = 1
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512 //};
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513
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514
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515 //class IMessage : public boost::noncopyable
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516 //{
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517 //private:
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518 // MessageType type_;
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519
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520 //public:
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521 // IMessage(MessageType type) :
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522 // type_(type)
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523 // {
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524 // }
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525
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526 // virtual ~IMessage()
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527 // {
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528 // }
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529
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530 // MessageType GetMessageType() const
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531 // {
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532 // return type_;
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533 // }
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534 //};
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535
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536
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537 //class IObserver : public boost::noncopyable
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538 //{
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539 //public:
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540 // virtual ~IObserver()
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541 // {
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542 // }
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543 //};
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544
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545
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546 //class SeriesDownloadedMessage : public IMessage
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547 //{
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548 //private:
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549 // std::string value_;
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550
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551 //public:
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552 // enum
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553 // {
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554 // Type = MessageType_SeriesDownloaded
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555 // };
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556
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557 // SeriesDownloadedMessage(const std::string& value) :
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558 // IMessage(static_cast<MessageType>(Type)),
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559 // value_(value)
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560 // {
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561 // }
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562
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563 // const std::string& GetValue() const
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564 // {
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565 // return value_;
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566 // }
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567 //};
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568
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diff changeset
569
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570 //class MyObserver : public IObserver
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571 //{
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572 //public:
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573 // void OnSeriesDownloaded(const SeriesDownloadedMessage& message)
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574 // {
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575 // printf("received: [%s]\n", message.GetValue().c_str());
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576 // }
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577 //};
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am@osimis.io
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578
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am@osimis.io
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diff changeset
579
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580
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581 //class ICallable : public boost::noncopyable // ne peut referencer que les classes de base
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582 //{
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583 //public:
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584 // virtual ~ICallable()
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585 // {
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586 // }
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587
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588 // virtual void Apply(const IMessage& message) = 0;
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589
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590 // virtual MessageType GetMessageType() const = 0;
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591 //};
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592
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am@osimis.io
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diff changeset
593
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594
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595 //template <typename Observer,
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596 // typename Message>
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597 //class Callable : public ICallable
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598 //{
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599 //private:
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600 // typedef void (Observer::* MemberFunction) (const Message&);
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601
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602 // Observer& observer_;
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603 // MemberFunction function_;
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604
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605 //public:
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606 // Callable(Observer& observer,
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607 // MemberFunction function) :
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608 // observer_(observer),
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609 // function_(function)
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610 // {
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611 // }
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612
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613 // void ApplyInternal(const Message& message)
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614 // {
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615 // (observer_.*function_) (message);
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616 // }
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617
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618 // virtual void Apply(const IMessage& message)
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619 // {
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620 // ApplyInternal(dynamic_cast<const Message&>(message));
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621 // }
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622
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623 // virtual MessageType GetMessageType() const
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624 // {
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625 // return static_cast<MessageType>(Message::Type);
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626 // }
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627 //};
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628
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629
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630
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631 //class IObservable : public boost::noncopyable
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632 //{
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633 //private:
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634 // typedef std::map<MessageType, std::set<ICallable*> > Callables;
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635
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636 // Callables callables_;
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637
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638 //public:
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639 // virtual ~IObservable()
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640 // {
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641 // for (Callables::const_iterator it = callables_.begin();
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642 // it != callables_.end(); ++it)
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643 // {
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644 // for (std::set<ICallable*>::const_iterator
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645 // it2 = it->second.begin(); it2 != it->second.end(); ++it2)
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646 // {
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647 // delete *it2;
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648 // }
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649 // }
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650 // }
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651
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652 // void Register(ICallable* callable)
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653 // {
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654 // MessageType type = callable->GetMessageType();
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655
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656 // callables_[type].insert(callable);
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657 // }
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658
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659 // void Emit(const IMessage& message) const
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660 // {
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661 // Callables::const_iterator found = callables_.find(message.GetMessageType());
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662
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663 // if (found != callables_.end())
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664 // {
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665 // for (std::set<ICallable*>::const_iterator
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666 // it = found->second.begin(); it != found->second.end(); ++it)
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667 // {
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668 // (*it)->Apply(message);
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669 // }
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670 // }
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671 // }
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672 //};
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673
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am@osimis.io
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674
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am@osimis.io
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675
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676
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677 //int main()
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678 //{
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679 // MyObserver observer;
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680
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681 // SeriesDownloadedMessage message("coucou");
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682
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683 // IObservable observable;
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684 // observable.Register(new Callable<MyObserver, SeriesDownloadedMessage>(observer, &MyObserver::OnSeriesDownloaded));
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685 // observable.Register(new Callable<MyObserver, SeriesDownloadedMessage>(observer, &MyObserver::OnSeriesDownloaded));
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686
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687 // SeriesDownloadedMessage message2("hello");
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688 // observable.Emit(message2);
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689
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690 // printf("%d\n", SeriesDownloadedMessage::Type);
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691 //}