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annotate UnitTestsSources/TestMessageBroker2_promise_and_connect_ok.cpp @ 568:6125640bffd6 cache-in-radiography

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author Alain Mazy <am@osimis.io>
date Thu, 18 Apr 2019 11:59:09 +0000
parents 3897f9f28cfa
children b70e9be013e4
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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 <boost/noncopyable.hpp>
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25 #include <boost/function.hpp>
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26 #include <boost/bind.hpp>
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27
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28 #include <string>
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29 #include <map>
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30 #include <set>
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31
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32 int testCounter = 0;
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33 namespace {
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34
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35 enum MessageType
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36 {
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37 MessageType_Test1,
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38 MessageType_Test2,
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39
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40 MessageType_CustomMessage,
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41 MessageType_LastGenericStoneMessage
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42 };
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43
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44 struct IMessage : public boost::noncopyable
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45 {
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46 MessageType messageType_;
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47 public:
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48 IMessage(const MessageType& messageType)
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49 : messageType_(messageType)
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50 {}
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51 virtual ~IMessage() {}
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52
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53 virtual int GetType() const {return messageType_;}
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54 };
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55
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56
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57 struct ICustomMessage : public IMessage
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58 {
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59 int customMessageType_;
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60 public:
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61 ICustomMessage(int customMessageType)
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62 : IMessage(MessageType_CustomMessage),
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63 customMessageType_(customMessageType)
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64 {}
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65 virtual ~ICustomMessage() {}
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66
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67 virtual int GetType() const {return customMessageType_;}
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68 };
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69
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70
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71 class IObserver;
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72 class IObservable;
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73 class IPromiseTarget;
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74 class IPromiseSource;
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75 class Promise;
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76
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77 /*
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78 * This is a central message broker. It keeps track of all observers and knows
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79 * when an observer is deleted.
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80 * This way, it can prevent an observable to send a message to a delete observer.
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81 * It does the same book-keeping for the IPromiseTarget and IPromiseSource
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82 */
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83 class MessageBroker : public boost::noncopyable
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84 {
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85
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86 std::set<IObserver*> activeObservers_; // the list of observers that are currently alive (that have not been deleted)
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87 std::set<IPromiseTarget*> activePromiseTargets_;
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88 std::set<IPromiseSource*> activePromiseSources_;
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89
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90 public:
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91
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92 void Register(IObserver& observer)
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93 {
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94 activeObservers_.insert(&observer);
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95 }
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96
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97 void Unregister(IObserver& observer)
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98 {
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99 activeObservers_.erase(&observer);
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100 }
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101
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102 void Register(IPromiseTarget& target)
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103 {
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104 activePromiseTargets_.insert(&target);
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105 }
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106
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107 void Unregister(IPromiseTarget& target)
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108 {
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109 activePromiseTargets_.erase(&target);
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110 }
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111
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112 void Register(IPromiseSource& source)
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113 {
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114 activePromiseSources_.insert(&source);
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115 }
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116
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117 void Unregister(IPromiseSource& source)
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118 {
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119 activePromiseSources_.erase(&source);
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120 }
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121
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122 void EmitMessage(IObservable& from, std::set<IObserver*> observers, const IMessage& message);
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123
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124 bool IsActive(IPromiseTarget* target)
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125 {
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126 return activePromiseTargets_.find(target) != activePromiseTargets_.end();
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127 }
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128
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129 bool IsActive(IPromiseSource* source)
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130 {
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131 return activePromiseSources_.find(source) != activePromiseSources_.end();
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132 }
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133
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134 bool IsActive(IObserver* observer)
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135 {
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136 return activeObservers_.find(observer) != activeObservers_.end();
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137 }
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138 };
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139
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140 struct IPromiseArgs
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141 {
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142 public:
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143 virtual ~IPromiseArgs() {}
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144 };
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145
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146 class EmptyPromiseArguments : public IPromiseArgs
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147 {
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148
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149 };
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150
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151 class Promise : public boost::noncopyable
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152 {
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153 protected:
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154 MessageBroker& broker_;
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155
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156 IPromiseTarget* successTarget_;
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157 boost::function<void (const IPromiseArgs& message)> successCallable_;
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158
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159 IPromiseTarget* failureTarget_;
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160 boost::function<void (const IPromiseArgs& message)> failureCallable_;
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161
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162 public:
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163 Promise(MessageBroker& broker)
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164 : broker_(broker),
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165 successTarget_(NULL),
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166 failureTarget_(NULL)
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167 {
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168 }
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169
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170 void Success(const IPromiseArgs& message)
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171 {
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172 // check the target is still alive in the broker
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173 if (broker_.IsActive(successTarget_))
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174 {
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175 successCallable_(message);
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176 }
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177 }
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178
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179 void Failure(const IPromiseArgs& message)
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180 {
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181 // check the target is still alive in the broker
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182 if (broker_.IsActive(failureTarget_))
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183 {
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184 failureCallable_(message);
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185 }
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186 }
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187
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188 Promise& Then(IPromiseTarget* target, boost::function<void (const IPromiseArgs& message)> f)
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189 {
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190 if (successTarget_ != NULL)
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191 {
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192 // TODO: throw throw new "Promise may only have a single success target"
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193 }
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194 successTarget_ = target;
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195 successCallable_ = f;
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196 return *this;
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197 }
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198
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199 Promise& Else(IPromiseTarget* target, boost::function<void (const IPromiseArgs& message)> f)
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200 {
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201 if (failureTarget_ != NULL)
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202 {
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203 // TODO: throw throw new "Promise may only have a single failure target"
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204 }
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205 failureTarget_ = target;
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206 failureCallable_ = f;
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207 return *this;
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208 }
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209
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210 };
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211
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212 class IObserver : public boost::noncopyable
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213 {
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214 protected:
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215 MessageBroker& broker_;
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216
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217 public:
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218 IObserver(MessageBroker& broker)
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219 : broker_(broker)
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220 {
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221 broker_.Register(*this);
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222 }
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223
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224 virtual ~IObserver()
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225 {
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226 broker_.Unregister(*this);
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227 }
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228
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229 };
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230
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231 class IPromiseTarget : public boost::noncopyable
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232 {
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233 protected:
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234 MessageBroker& broker_;
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235
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236 public:
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237 IPromiseTarget(MessageBroker& broker)
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238 : broker_(broker)
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239 {
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240 broker_.Register(*this);
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241 }
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242
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243 virtual ~IPromiseTarget()
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244 {
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245 broker_.Unregister(*this);
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246 }
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247 };
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248
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249 class IPromiseSource : public boost::noncopyable
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250 {
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251 protected:
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252 MessageBroker& broker_;
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253
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254 public:
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255 IPromiseSource(MessageBroker& broker)
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256 : broker_(broker)
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257 {
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258 broker_.Register(*this);
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259 }
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260
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261 virtual ~IPromiseSource()
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262 {
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263 broker_.Unregister(*this);
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264 }
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265 };
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266
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267
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268 struct CallableObserver
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269 {
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270 IObserver* observer;
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271 boost::function<void (IObservable& from, const IMessage& message)> f;
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272 };
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273
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274 class IObservable : public boost::noncopyable
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275 {
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276 protected:
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277 MessageBroker& broker_;
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278
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279 std::set<IObserver*> observers_;
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280
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281 std::map<int, std::set<CallableObserver*> > callables_;
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282 public:
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283
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284 IObservable(MessageBroker& broker)
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285 : broker_(broker)
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286 {
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287 }
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288 virtual ~IObservable()
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289 {
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290 }
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291
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292 void EmitMessage(const IMessage& message)
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293 {
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294 //broker_.EmitMessage(*this, observers_, message);
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295 int messageType = message.GetType();
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296 if (callables_.find(messageType) != callables_.end())
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297 {
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298 for (std::set<CallableObserver*>::iterator observer = callables_[messageType].begin(); observer != callables_[messageType].end(); observer++)
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299 {
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300 CallableObserver* callable = *observer;
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301 if (broker_.IsActive(callable->observer))
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302 {
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303 callable->f(*this, message);
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304 }
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305 }
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306 }
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307
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308 }
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309
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310 void RegisterObserver(IObserver& observer)
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311 {
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312 observers_.insert(&observer);
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313 }
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314
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315 void UnregisterObserver(IObserver& observer)
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316 {
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317 observers_.erase(&observer);
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318 }
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319
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320 //template<typename TObserver> void Connect(MessageType messageType, IObserver& observer, void (TObserver::*ptrToMemberHandler)(IObservable& from, const IMessage& message))
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321 void Connect(int messageType, IObserver& observer, boost::function<void (IObservable& from, const IMessage& message)> f)
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322 {
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323 callables_[messageType] = std::set<CallableObserver*>();
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324 CallableObserver* callable = new CallableObserver();
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325 callable->observer = &observer;
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326 callable->f = f;
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327 callables_[messageType].insert(callable);
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328 }
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329 };
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330
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331
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332 enum CustomMessageType
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333 {
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334 CustomMessageType_First = MessageType_LastGenericStoneMessage + 1,
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335
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336 CustomMessageType_Completed
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337 };
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338
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339 class MyObservable : public IObservable
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340 {
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341 public:
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342 struct MyCustomMessage: public ICustomMessage
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343 {
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344 int payload_;
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345 MyCustomMessage(int payload)
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346 : ICustomMessage(CustomMessageType_Completed),
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347 payload_(payload)
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348 {}
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349 };
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350
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351 MyObservable(MessageBroker& broker)
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352 : IObservable(broker)
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353 {}
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354
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355 };
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356
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357 class MyObserver : public IObserver
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358 {
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359 public:
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360 MyObserver(MessageBroker& broker)
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361 : IObserver(broker)
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362 {}
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363 void HandleCompletedMessage(IObservable& from, const IMessage& message)
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364 {
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365 const MyObservable::MyCustomMessage& msg = dynamic_cast<const MyObservable::MyCustomMessage&>(message);
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366 testCounter += msg.payload_;
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367 }
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368
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369 };
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370
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371
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372 class MyPromiseSource : public IPromiseSource
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373 {
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374 Promise* currentPromise_;
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375 public:
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376 struct MyPromiseArgs : public IPromiseArgs
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377 {
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378 int increment;
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379 };
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380
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381 MyPromiseSource(MessageBroker& broker)
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382 : IPromiseSource(broker),
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383 currentPromise_(NULL)
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384 {}
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385
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386 Promise& StartSomethingAsync()
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387 {
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388 currentPromise_ = new Promise(broker_);
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389 return *currentPromise_;
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390 }
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391
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392 void CompleteSomethingAsyncWithSuccess()
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393 {
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394 currentPromise_->Success(EmptyPromiseArguments());
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395 delete currentPromise_;
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396 }
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397
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398 void CompleteSomethingAsyncWithFailure()
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399 {
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400 currentPromise_->Failure(EmptyPromiseArguments());
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401 delete currentPromise_;
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402 }
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403 };
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404
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405
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406 class MyPromiseTarget : public IPromiseTarget
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407 {
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408 public:
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409 MyPromiseTarget(MessageBroker& broker)
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410 : IPromiseTarget(broker)
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411 {}
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412
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413 void IncrementCounter(const IPromiseArgs& args)
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414 {
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415 testCounter++;
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416 }
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417
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418 void DecrementCounter(const IPromiseArgs& args)
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419 {
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420 testCounter--;
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421 }
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422 };
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423 }
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424
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425 #define CONNECT_MESSAGES(observablePtr, messageType, observerPtr, observerFnPtr) (observablePtr)->Connect(messageType, *(observerPtr), boost::bind(observerFnPtr, observerPtr, _1, _2))
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426 #define PTHEN(targetPtr, targetFnPtr) Then(targetPtr, boost::bind(targetFnPtr, targetPtr, _1))
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427 #define PELSE(targetPtr, targetFnPtr) Else(targetPtr, boost::bind(targetFnPtr, targetPtr, _1))
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428
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429
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430 TEST(MessageBroker2, TestPermanentConnectionSimpleUseCase)
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431 {
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432 MessageBroker broker;
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433 MyObservable observable(broker);
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434 MyObserver observer(broker);
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435
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436 // create a permanent connection between an observable and an observer
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437 CONNECT_MESSAGES(&observable, CustomMessageType_Completed, &observer, &MyObserver::HandleCompletedMessage);
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438
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439 testCounter = 0;
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440 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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441 ASSERT_EQ(12, testCounter);
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442
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443 // the connection is permanent; if we emit the same message again, the observer will be notified again
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444 testCounter = 0;
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445 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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446 ASSERT_EQ(20, testCounter);
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447 }
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448
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449 TEST(MessageBroker2, TestPermanentConnectionDeleteObserver)
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450 {
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451 MessageBroker broker;
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452 MyObservable observable(broker);
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453 MyObserver* observer = new MyObserver(broker);
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454
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455 // create a permanent connection between an observable and an observer
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456 CONNECT_MESSAGES(&observable, CustomMessageType_Completed, observer, &MyObserver::HandleCompletedMessage);
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457
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458 testCounter = 0;
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459 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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460 ASSERT_EQ(12, testCounter);
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461
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462 // delete the observer and check that the callback is not called anymore
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463 delete observer;
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464
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465 // the connection is permanent; if we emit the same message again, the observer will be notified again
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466 testCounter = 0;
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467 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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468 ASSERT_EQ(0, testCounter);
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469 }
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470
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471
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472 TEST(MessageBroker2, TestPromiseSuccessFailure)
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473 {
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474 MessageBroker broker;
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475 MyPromiseSource source(broker);
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476 MyPromiseTarget target(broker);
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477
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478 // test a successful promise
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479 source.StartSomethingAsync()
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480 .PTHEN(&target, &MyPromiseTarget::IncrementCounter)
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481 .PELSE(&target, &MyPromiseTarget::DecrementCounter);
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482
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483 testCounter = 0;
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484 source.CompleteSomethingAsyncWithSuccess();
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485 ASSERT_EQ(1, testCounter);
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486
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487 // test a failing promise
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488 source.StartSomethingAsync()
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489 .PTHEN(&target, &MyPromiseTarget::IncrementCounter)
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490 .PELSE(&target, &MyPromiseTarget::DecrementCounter);
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491
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492 testCounter = 0;
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493 source.CompleteSomethingAsyncWithFailure();
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494 ASSERT_EQ(-1, testCounter);
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495 }
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496
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497 //TEST(MessageBroker2, TestPromiseDeleteTarget)
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498 //{
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499 // MessageBroker broker;
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500 // MyPromiseSource source(broker);
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501 // MyPromiseTarget target(broker);
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502
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503 // // test a successful promise
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504 // source.StartSomethingAsync()
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505 // .PTHEN(&target, &MyPromiseTarget::IncrementCounter)
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506 // .PELSE(&target, &MyPromiseTarget::DecrementCounter);
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507
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508 // testCounter = 0;
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509 // source.CompleteSomethingAsyncWithSuccess();
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510 // ASSERT_EQ(1, testCounter);
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511
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512 // // test a failing promise
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513 // source.StartSomethingAsync()
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514 // .PTHEN(&target, &MyPromiseTarget::IncrementCounter)
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515 // .PELSE(&target, &MyPromiseTarget::DecrementCounter);
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516
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517 // testCounter = 0;
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518 // source.CompleteSomethingAsyncWithFailure();
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519 // ASSERT_EQ(-1, testCounter);
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520 //}