Mercurial > hg > orthanc-stone

annotate Framework/Toolbox/OrthancApiClient.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
parents 46c5296d867e
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 #include "OrthancApiClient.h"
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22
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23 #include "MessagingToolbox.h"
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24 #include <Core/OrthancException.h>
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25
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26 namespace OrthancStone {
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27
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28 struct OrthancApiClient::InternalGetJsonResponseReadyMessage :
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29 public IMessage
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30 {
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31 OrthancApiClient::BaseRequest* request_;
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32 Json::Value response_;
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33
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34 InternalGetJsonResponseReadyMessage(OrthancApiClient::BaseRequest* request,
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35 const Json::Value& response)
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36 : IMessage(MessageType_OrthancApi_InternalGetJsonResponseReady),
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37 request_(request),
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38 response_(response)
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39 {
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40 }
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41
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42 };
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43
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44 struct OrthancApiClient::InternalGetJsonResponseErrorMessage :
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45 public IMessage
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46 {
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47 OrthancApiClient::BaseRequest* request_;
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48
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49 InternalGetJsonResponseErrorMessage(OrthancApiClient::BaseRequest* request)
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50 : IMessage(MessageType_OrthancApi_InternalGetJsonResponseError),
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51 request_(request)
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52 {
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53 }
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54 };
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55
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56
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57 // this class handles a single request to the OrthancApiClient.
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58 // Once the response is ready, it will emit a message to the responseObserver
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59 // the responseObserver must handle only that message (and not all messages from the OrthancApiClient)
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60 class OrthancApiClient::BaseRequest:
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61 // public IObserver,
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62 public IObservable,
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63 public Orthanc::IDynamicObject
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64 {
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65 public:
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66 std::string uri_;
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67 OrthancApiClient& orthanc_;
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68 MessageType messageToEmitWhenResponseReady_;
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69 OrthancApiClient::Mode mode_;
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70
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71 public:
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72 BaseRequest(
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73 OrthancApiClient& orthanc,
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74 IObserver& responseObserver,
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75 const std::string& uri,
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76 MessageType messageToEmitWhenResponseReady,
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77 OrthancApiClient::Mode mode)
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78 :
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79 //IObserver(orthanc.broker_),
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80 IObservable(orthanc.broker_),
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81 uri_(uri),
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82 orthanc_(orthanc),
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83 messageToEmitWhenResponseReady_(messageToEmitWhenResponseReady),
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84 mode_(mode)
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85 {
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86 // this object will emit only a single message, the one the final responseObserver is expecting
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87 DeclareEmittableMessage(messageToEmitWhenResponseReady);
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88
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89 // // this object is observing the OrthancApi so it must handle all messages
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90 // DeclareHandledMessage(MessageType_OrthancApi_InternalGetJsonResponseReady);
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91 // DeclareIgnoredMessage(MessageType_OrthancApi_InternalGetJsonResponseError);
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92
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93 //orthanc_.RegisterObserver(*this);
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94 //this->RegisterObserver(responseObserver);
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95 }
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96 virtual ~BaseRequest() {}
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97
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98 // // mainly maps OrthancApi internal messages to a message that is expected by the responseObserver
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99 // virtual void HandleMessage(IObservable& from, const IMessage& message)
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100 // {
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101 // switch (message.GetType())
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102 // {
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103 // case MessageType_OrthancApi_InternalGetJsonResponseReady:
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104 // {
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105 // const OrthancApiClient::InternalGetJsonResponseReadyMessage& messageReceived = dynamic_cast<const OrthancApiClient::InternalGetJsonResponseReadyMessage&>(message);
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106 // EmitMessage(OrthancApiClient::GetJsonResponseReadyMessage(messageToEmitWhenResponseReady_, messageReceived.request_->uri_, messageReceived.response_));
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107 // orthanc_.ReleaseRequest(messageReceived.request_);
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108 // }; break;
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109 // default:
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110 // throw MessageNotDeclaredException(message.GetType());
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111 // }
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112 // }
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113
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114 };
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115
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116
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117 class OrthancApiClient::WebCallback : public IWebService::ICallback
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118 {
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119 private:
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120 OrthancApiClient& that_;
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121
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122 public:
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123 WebCallback(MessageBroker& broker, OrthancApiClient& that) :
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124 IWebService::ICallback(broker),
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125 that_(that)
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126 {
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127 }
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128
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129 virtual void OnHttpRequestSuccess(const std::string& uri,
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130 const void* answer,
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131 size_t answerSize,
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132 Orthanc::IDynamicObject* payload)
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133 {
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134 OrthancApiClient::BaseRequest* request = dynamic_cast<OrthancApiClient::BaseRequest*>(payload); // the BaseRequests objects belongs to the OrthancApiClient and is deleted in ReleaseRequest when it has been "consumed"
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135
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136 switch (request->mode_)
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137 {
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138 case OrthancApiClient::Mode_GetJson:
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139 {
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140 Json::Value response;
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141 if (MessagingToolbox::ParseJson(response, answer, answerSize))
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142 {
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143 request->EmitMessage(OrthancApiClient::GetJsonResponseReadyMessage(request->messageToEmitWhenResponseReady_, request->uri_, response));
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144 }
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145 else
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146 {
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147 // OrthancApiClient::InternalGetJsonResponseErrorMessage msg(request);
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148 // that_.EmitMessage(msg);
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149 }
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150 }; break;
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151
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152 default:
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153 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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154 }
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155 that_.ReleaseRequest(request);
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156 }
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157
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158 virtual void OnHttpRequestError(const std::string& uri,
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159 Orthanc::IDynamicObject* payload)
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160 {
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161 OrthancApiClient::BaseRequest* request = dynamic_cast<OrthancApiClient::BaseRequest*>(payload); // the BaseRequests objects belongs to the OrthancApiClient and is deleted in ReleaseRequest when it has been "consumed"
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162
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163 switch (request->mode_)
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164 {
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165 case OrthancApiClient::Mode_GetJson:
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166 {
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167 // OrthancApiClient::InternalGetJsonResponseErrorMessage msg(request);
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168 // that_.EmitMessage(msg);
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169 // TODO: the request shall send an error message
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170 }; break;
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171
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172 default:
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173 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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174 }
271
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175 that_.ReleaseRequest(request);
270
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176 }
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177 };
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178
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179 OrthancApiClient::OrthancApiClient(MessageBroker &broker, IWebService &orthanc)
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180 : IObservable(broker),
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181 orthanc_(orthanc),
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182 webCallback_(new OrthancApiClient::WebCallback(broker, *this))
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183 {
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184 DeclareEmittableMessage(MessageType_OrthancApi_InternalGetJsonResponseReady);
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185 DeclareEmittableMessage(MessageType_OrthancApi_InternalGetJsonResponseError);
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186 }
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187
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188 void OrthancApiClient::ScheduleGetJsonRequest(IObserver &responseObserver, const std::string &uri, MessageType messageToEmitWhenResponseReady)
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189 {
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190 OrthancApiClient::BaseRequest* request = new OrthancApiClient::BaseRequest(*this,
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191 responseObserver,
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192 uri,
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193 messageToEmitWhenResponseReady,
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194 OrthancApiClient::Mode_GetJson);
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195 orthanc_.ScheduleGetRequest(*webCallback_, uri, IWebService::Headers(), request);
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196 requestsInProgress_.insert(request);
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197 }
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198
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199 void OrthancApiClient::ReleaseRequest(BaseRequest* request)
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200 {
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201 requestsInProgress_.erase(request);
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202 delete request;
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203 }
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204
299
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205 // performs the translation between IWebService messages and OrthancApiClient messages
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206 // TODO: handle destruction of this object (with shared_ptr ?::delete_later ???)
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207 class HttpResponseToJsonConverter : public IObserver, IObservable
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208 {
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209 std::auto_ptr<MessageHandler<OrthancApiClient::NewGetJsonResponseReadyMessage>> orthancApiSuccessCallback_;
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210 std::auto_ptr<MessageHandler<OrthancApiClient::NewHttpErrorMessage>> orthancApiFailureCallback_;
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211 public:
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212 HttpResponseToJsonConverter(MessageBroker& broker,
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213 MessageHandler<OrthancApiClient::NewGetJsonResponseReadyMessage>* orthancApiSuccessCallback,
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214 MessageHandler<OrthancApiClient::NewHttpErrorMessage>* orthancApiFailureCallback)
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215 : IObserver(broker),
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216 IObservable(broker),
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217 orthancApiSuccessCallback_(orthancApiSuccessCallback),
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218 orthancApiFailureCallback_(orthancApiFailureCallback)
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219 {
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220 }
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221
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222 void ConvertResponseToJson(const IWebService::NewHttpRequestSuccessMessage& message)
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223 {
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224 Json::Value response;
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225 if (MessagingToolbox::ParseJson(response, message.Answer, message.AnswerSize))
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226 {
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227 if (orthancApiSuccessCallback_.get() != NULL)
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228 {
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229 orthancApiSuccessCallback_->Apply(OrthancApiClient::NewGetJsonResponseReadyMessage(message.Uri, response));
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230 }
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231 }
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232 else if (orthancApiFailureCallback_.get() != NULL)
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233 {
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234 orthancApiFailureCallback_->Apply(OrthancApiClient::NewHttpErrorMessage(message.Uri));
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235 }
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236
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237 delete this; // hack untill we find someone to take ownership of this object (https://isocpp.org/wiki/faq/freestore-mgmt#delete-this)
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238 }
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239
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240 void ConvertError(const IWebService::NewHttpRequestErrorMessage& message)
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241 {
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242 if (orthancApiFailureCallback_.get() != NULL)
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243 {
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244 orthancApiFailureCallback_->Apply(OrthancApiClient::NewHttpErrorMessage(message.Uri));
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245 }
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246
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247 delete this; // hack untill we find someone to take ownership of this object (https://isocpp.org/wiki/faq/freestore-mgmt#delete-this)
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248 }
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249 };
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250
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251 void OrthancApiClient::GetJsonAsync(const std::string& uri,
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252 MessageHandler<NewGetJsonResponseReadyMessage>* successCallback,
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253 MessageHandler<NewHttpErrorMessage>* failureCallback)
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254 {
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255 HttpResponseToJsonConverter* converter = new HttpResponseToJsonConverter(broker_, successCallback, failureCallback);
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256 orthanc_.GetAsync(uri, IWebService::Headers(), NULL,
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257 new Callable<HttpResponseToJsonConverter, IWebService::NewHttpRequestSuccessMessage>(*converter, &HttpResponseToJsonConverter::ConvertResponseToJson),
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258 new Callable<HttpResponseToJsonConverter, IWebService::NewHttpRequestErrorMessage>(*converter, &HttpResponseToJsonConverter::ConvertError));
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259
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260 }
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261
270
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262 }