Mercurial > hg > orthanc-stone

annotate UnitTestsSources/TestMessageBroker2.cpp @ 323:dbfe2e9e5020 am-2

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playing with LambdaCallable
author am@osimis.io
date Mon, 15 Oct 2018 23:36:43 +0200
parents 4a79193ffb58
children e7a494bdd956
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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 #include "Framework/Messages/Promise.h"
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26 #include "Framework/Messages/IObservable.h"
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27 #include "Framework/Messages/IObserver.h"
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28 #include "Framework/Messages/MessageForwarder.h"
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31 int testCounter = 0;
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32 namespace {
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33
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34 using namespace OrthancStone;
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35
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36
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37 enum CustomMessageType
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38 {
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39 CustomMessageType_First = MessageType_CustomMessage + 1,
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40
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41 CustomMessageType_Completed,
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42 CustomMessageType_Increment
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43 };
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44
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45
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46 class MyObservable : public IObservable
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47 {
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48 public:
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49 struct MyCustomMessage: public BaseMessage<CustomMessageType_Completed>
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50 {
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51 int payload_;
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52
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53 MyCustomMessage(int payload)
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54 : BaseMessage(),
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55 payload_(payload)
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56 {}
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57 };
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58
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59 MyObservable(MessageBroker& broker)
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60 : IObservable(broker)
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61 {}
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62
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63 };
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64
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65 class MyObserver : public IObserver
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66 {
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67 public:
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68 MyObserver(MessageBroker& broker)
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69 : IObserver(broker)
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70 {}
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71
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72 void HandleCompletedMessage(const MyObservable::MyCustomMessage& message)
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73 {
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74 testCounter += message.payload_;
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75 }
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76
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77 };
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79
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80 class MyIntermediate : public IObserver, public IObservable
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81 {
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82 IObservable& observedObject_;
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83 public:
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84 MyIntermediate(MessageBroker& broker, IObservable& observedObject)
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85 : IObserver(broker),
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86 IObservable(broker),
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87 observedObject_(observedObject)
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88 {
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89 observedObject_.RegisterObserverCallback(new MessageForwarder<MyObservable::MyCustomMessage>(broker, *this));
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90 }
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91 };
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92
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93
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94 class MyPromiseSource : public IObservable
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95 {
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96 Promise* currentPromise_;
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97 public:
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98 struct MyPromiseMessage: public BaseMessage<MessageType_Test1>
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99 {
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100 int increment;
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101
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102 MyPromiseMessage(int increment)
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103 : BaseMessage(),
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104 increment(increment)
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105 {}
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106 };
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107
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108 MyPromiseSource(MessageBroker& broker)
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109 : IObservable(broker),
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110 currentPromise_(NULL)
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111 {}
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112
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113 Promise& StartSomethingAsync()
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114 {
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115 currentPromise_ = new Promise(broker_);
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116 return *currentPromise_;
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117 }
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118
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119 void CompleteSomethingAsyncWithSuccess(int payload)
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120 {
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121 currentPromise_->Success(MyPromiseMessage(payload));
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122 delete currentPromise_;
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123 }
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124
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125 void CompleteSomethingAsyncWithFailure(int payload)
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126 {
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127 currentPromise_->Failure(MyPromiseMessage(payload));
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128 delete currentPromise_;
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129 }
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130 };
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132
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133 class MyPromiseTarget : public IObserver
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134 {
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135 public:
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136 MyPromiseTarget(MessageBroker& broker)
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137 : IObserver(broker)
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138 {}
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139
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140 void IncrementCounter(const MyPromiseSource::MyPromiseMessage& args)
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141 {
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142 testCounter += args.increment;
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143 }
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144
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145 void DecrementCounter(const MyPromiseSource::MyPromiseMessage& args)
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146 {
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147 testCounter -= args.increment;
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148 }
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149 };
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150 }
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151
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152
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153 TEST(MessageBroker2, TestPermanentConnectionSimpleUseCase)
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154 {
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155 MessageBroker broker;
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156 MyObservable observable(broker);
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157 MyObserver observer(broker);
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158
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159 // create a permanent connection between an observable and an observer
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160 observable.RegisterObserverCallback(new Callable<MyObserver, MyObservable::MyCustomMessage>(observer, &MyObserver::HandleCompletedMessage));
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161
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162 testCounter = 0;
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163 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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164 ASSERT_EQ(12, testCounter);
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165
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166 // the connection is permanent; if we emit the same message again, the observer will be notified again
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167 testCounter = 0;
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168 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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169 ASSERT_EQ(20, testCounter);
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170 }
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171
323
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172 TEST(MessageBroker2, TestMessageForwarderSimpleUseCase)
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173 {
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174 MessageBroker broker;
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175 MyObservable observable(broker);
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176 MyIntermediate intermediate(broker, observable);
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177 MyObserver observer(broker);
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178
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179 // let the observer observers the intermediate that is actually forwarding the messages from the observable
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180 intermediate.RegisterObserverCallback(new Callable<MyObserver, MyObservable::MyCustomMessage>(observer, &MyObserver::HandleCompletedMessage));
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181
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182 testCounter = 0;
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183 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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184 ASSERT_EQ(12, testCounter);
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185
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186 // the connection is permanent; if we emit the same message again, the observer will be notified again
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187 testCounter = 0;
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188 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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189 ASSERT_EQ(20, testCounter);
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190 }
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191
299
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192 TEST(MessageBroker2, TestPermanentConnectionDeleteObserver)
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193 {
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194 MessageBroker broker;
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195 MyObservable observable(broker);
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196 MyObserver* observer = new MyObserver(broker);
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197
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198 // create a permanent connection between an observable and an observer
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199 observable.RegisterObserverCallback(new Callable<MyObserver, MyObservable::MyCustomMessage>(*observer, &MyObserver::HandleCompletedMessage));
299
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200
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201 testCounter = 0;
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202 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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203 ASSERT_EQ(12, testCounter);
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204
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205 // delete the observer and check that the callback is not called anymore
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206 delete observer;
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207
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208 // the connection is permanent; if we emit the same message again, the observer will be notified again
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209 testCounter = 0;
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210 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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211 ASSERT_EQ(0, testCounter);
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212 }
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213
302
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214 TEST(MessageBroker2, TestMessageForwarderDeleteIntermediate)
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215 {
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216 MessageBroker broker;
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217 MyObservable observable(broker);
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218 MyIntermediate* intermediate = new MyIntermediate(broker, observable);
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219 MyObserver observer(broker);
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220
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221 // let the observer observers the intermediate that is actually forwarding the messages from the observable
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222 intermediate->RegisterObserverCallback(new Callable<MyObserver, MyObservable::MyCustomMessage>(observer, &MyObserver::HandleCompletedMessage));
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223
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224 testCounter = 0;
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225 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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226 ASSERT_EQ(12, testCounter);
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227
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228 delete intermediate;
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229
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230 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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231 ASSERT_EQ(12, testCounter);
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232 }
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233
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234 TEST(MessageBroker2, TestCustomMessage)
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235 {
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236 MessageBroker broker;
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237 MyObservable observable(broker);
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238 MyIntermediate intermediate(broker, observable);
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239 MyObserver observer(broker);
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240
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241 // let the observer observers the intermediate that is actually forwarding the messages from the observable
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242 intermediate.RegisterObserverCallback(new Callable<MyObserver, MyObservable::MyCustomMessage>(observer, &MyObserver::HandleCompletedMessage));
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243
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244 testCounter = 0;
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245 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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246 ASSERT_EQ(12, testCounter);
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247
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248 // the connection is permanent; if we emit the same message again, the observer will be notified again
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249 testCounter = 0;
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250 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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251 ASSERT_EQ(20, testCounter);
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252 }
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253
299
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254
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255 TEST(MessageBroker2, TestPromiseSuccessFailure)
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256 {
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257 MessageBroker broker;
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258 MyPromiseSource source(broker);
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259 MyPromiseTarget target(broker);
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260
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261 // test a successful promise
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262 source.StartSomethingAsync()
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263 .Then(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(target, &MyPromiseTarget::IncrementCounter))
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264 .Else(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(target, &MyPromiseTarget::DecrementCounter));
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265
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266 testCounter = 0;
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267 source.CompleteSomethingAsyncWithSuccess(10);
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268 ASSERT_EQ(10, testCounter);
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269
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270 // test a failing promise
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271 source.StartSomethingAsync()
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272 .Then(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(target, &MyPromiseTarget::IncrementCounter))
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273 .Else(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(target, &MyPromiseTarget::DecrementCounter));
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274
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275 testCounter = 0;
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276 source.CompleteSomethingAsyncWithFailure(15);
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277 ASSERT_EQ(-15, testCounter);
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278 }
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279
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280 TEST(MessageBroker2, TestPromiseDeleteTarget)
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281 {
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282 MessageBroker broker;
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283 MyPromiseSource source(broker);
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284 MyPromiseTarget* target = new MyPromiseTarget(broker);
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285
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286 // create the promise
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287 source.StartSomethingAsync()
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288 .Then(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(*target, &MyPromiseTarget::IncrementCounter))
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289 .Else(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(*target, &MyPromiseTarget::DecrementCounter));
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290
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291 // delete the promise target
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292 delete target;
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293
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294 // trigger the promise, make sure it does not throw and does not call the callback
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295 testCounter = 0;
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296 source.CompleteSomethingAsyncWithSuccess(10);
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297 ASSERT_EQ(0, testCounter);
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298
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299 // test a failing promise
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300 source.StartSomethingAsync()
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301 .Then(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(*target, &MyPromiseTarget::IncrementCounter))
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302 .Else(new Callable<MyPromiseTarget, MyPromiseSource::MyPromiseMessage>(*target, &MyPromiseTarget::DecrementCounter));
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303
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304 testCounter = 0;
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305 source.CompleteSomethingAsyncWithFailure(15);
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306 ASSERT_EQ(0, testCounter);
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307 }
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308
323
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309 #if __cplusplus >= 201103L
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310
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311 #include <functional>
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312
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313 namespace OrthancStone {
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314
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315 template <typename TMessage>
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316 class LambdaCallable : public MessageHandler<TMessage>
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317 {
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318 private:
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319
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320 IObserver& observer_;
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321 std::function<void (const TMessage&)> lambda_;
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322
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323 public:
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324 LambdaCallable(IObserver& observer,
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325 std::function<void (const TMessage&)> lambdaFunction) :
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326 observer_(observer),
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327 lambda_(lambdaFunction)
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328 {
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329 }
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330
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331 virtual void Apply(const IMessage& message)
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332 {
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333 lambda_(dynamic_cast<const TMessage&>(message));
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334 }
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335
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336 virtual MessageType GetMessageType() const
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337 {
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338 return static_cast<MessageType>(TMessage::Type);
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339 }
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340
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341 virtual IObserver* GetObserver() const
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342 {
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343 return &observer_;
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344 }
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345 };
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346
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347
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348 }
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349
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350 TEST(MessageBroker2, TestLambdaSimpleUseCase)
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351 {
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352 MessageBroker broker;
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353 MyObservable observable(broker);
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354 MyObserver* observer = new MyObserver(broker);
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355
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356 // create a permanent connection between an observable and an observer
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357 observable.RegisterObserverCallback(new LambdaCallable<MyObservable::MyCustomMessage>(*observer, [&](const MyObservable::MyCustomMessage& message) {testCounter += 2 * message.payload_;}));
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358
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359 testCounter = 0;
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360 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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361 ASSERT_EQ(24, testCounter);
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362
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363 // delete the observer and check that the callback is not called anymore
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364 delete observer;
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365
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366 // the connection is permanent; if we emit the same message again, the observer will be notified again
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367 testCounter = 0;
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368 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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369 ASSERT_EQ(0, testCounter);
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370 }
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371
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372 namespace {
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373 class MyObserverWithLambda : public IObserver {
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374 private:
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375 int multiplier_; // this is a private variable we want to access in a lambda
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376
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377 public:
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378 MyObserverWithLambda(MessageBroker& broker, int multiplier, MyObservable& observable)
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379 : IObserver(broker),
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380 multiplier_(multiplier)
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381 {
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382 // register a callable to a lambda that access private members
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383 observable.RegisterObserverCallback(new LambdaCallable<MyObservable::MyCustomMessage>(*this, [this](const MyObservable::MyCustomMessage& message) {
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384 testCounter += multiplier_ * message.payload_;
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385 }));
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386
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387 }
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388 };
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389 }
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390
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391 TEST(MessageBroker2, TestLambdaCaptureThisAndAccessPrivateMembers)
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392 {
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393 MessageBroker broker;
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394 MyObservable observable(broker);
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395 MyObserverWithLambda* observer = new MyObserverWithLambda(broker, 3, observable);
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396
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397 testCounter = 0;
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398 observable.EmitMessage(MyObservable::MyCustomMessage(12));
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399 ASSERT_EQ(36, testCounter);
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400
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401 // delete the observer and check that the callback is not called anymore
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402 delete observer;
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403
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404 // the connection is permanent; if we emit the same message again, the observer will be notified again
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405 testCounter = 0;
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406 observable.EmitMessage(MyObservable::MyCustomMessage(20));
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407 ASSERT_EQ(0, testCounter);
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408 }
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409
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410 #endif // C++ 11