annotate Framework/Loaders/LoaderStateMachine.cpp @ 879:12b591d5d63c am-dev

some Qt integration (wip)
author Alain Mazy <alain@mazy.be>
date Fri, 05 Jul 2019 14:52:43 +0200
parents 47fc7919977d
children a7351ad54960
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "LoaderStateMachine.h"
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23
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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 void LoaderStateMachine::State::Handle(const OrthancRestApiCommand::SuccessMessage& message)
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29 {
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30 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented);
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31 }
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32
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33
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34 void LoaderStateMachine::State::Handle(const GetOrthancImageCommand::SuccessMessage& message)
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35 {
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36 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented);
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37 }
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38
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39
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40 void LoaderStateMachine::State::Handle(const GetOrthancWebViewerJpegCommand::SuccessMessage& message)
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41 {
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42 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented);
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43 }
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44
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45
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46 void LoaderStateMachine::Schedule(OracleCommandWithPayload* command)
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47 {
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48 std::auto_ptr<OracleCommandWithPayload> protection(command);
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49
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50 if (command == NULL)
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51 {
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52 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
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53 }
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54
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55 if (!command->HasPayload())
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56 {
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57 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange,
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58 "The payload must contain the next state");
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59 }
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60
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61 pendingCommands_.push_back(protection.release());
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62 Step();
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63 }
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64
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65
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66 void LoaderStateMachine::Start()
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67 {
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68 if (active_)
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69 {
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70 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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71 }
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72
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73 active_ = true;
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74
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75 for (size_t i = 0; i < simultaneousDownloads_; i++)
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76 {
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77 Step();
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78 }
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79 }
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80
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81
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82 void LoaderStateMachine::Step()
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83 {
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84 if (!pendingCommands_.empty() &&
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85 activeCommands_ < simultaneousDownloads_)
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86 {
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87 oracle_.Schedule(*this, pendingCommands_.front());
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88 pendingCommands_.pop_front();
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89
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90 activeCommands_++;
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91 }
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92 }
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93
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94
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95 void LoaderStateMachine::Clear()
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96 {
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97 for (PendingCommands::iterator it = pendingCommands_.begin();
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98 it != pendingCommands_.end(); ++it)
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99 {
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100 delete *it;
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101 }
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102
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103 pendingCommands_.clear();
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104 }
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105
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106
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107 void LoaderStateMachine::HandleExceptionMessage(const OracleCommandExceptionMessage& message)
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108 {
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109 LOG(ERROR) << "Error in the state machine, stopping all processing";
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110 LOG(ERROR) << "Error: " << message.GetException().What() << " Details: " <<
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111 message.GetException().GetDetails();
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112 Clear();
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113 }
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114
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115
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116 template <typename T>
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117 void LoaderStateMachine::HandleSuccessMessage(const T& message)
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118 {
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119 assert(activeCommands_ > 0);
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120 activeCommands_--;
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121
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122 try
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123 {
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124 dynamic_cast<State&>(message.GetOrigin().GetPayload()).Handle(message);
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125 Step();
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126 }
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127 catch (Orthanc::OrthancException& e)
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128 {
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129 LOG(ERROR) << "Error in the state machine, stopping all processing: " <<
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130 e.What() << " Details: " << e.GetDetails();
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131 Clear();
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132 }
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133 }
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134
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135
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136 LoaderStateMachine::LoaderStateMachine(IOracle& oracle,
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137 IObservable& oracleObservable) :
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138 IObserver(oracleObservable.GetBroker()),
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139 oracle_(oracle),
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140 active_(false),
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141 simultaneousDownloads_(4),
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142 activeCommands_(0)
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143 {
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144 oracleObservable.RegisterObserverCallback(
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145 new Callable<LoaderStateMachine, OrthancRestApiCommand::SuccessMessage>
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146 (*this, &LoaderStateMachine::HandleSuccessMessage));
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147
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148 oracleObservable.RegisterObserverCallback(
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149 new Callable<LoaderStateMachine, GetOrthancImageCommand::SuccessMessage>
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150 (*this, &LoaderStateMachine::HandleSuccessMessage));
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151
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152 oracleObservable.RegisterObserverCallback(
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153 new Callable<LoaderStateMachine, GetOrthancWebViewerJpegCommand::SuccessMessage>
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154 (*this, &LoaderStateMachine::HandleSuccessMessage));
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155
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156 oracleObservable.RegisterObserverCallback(
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157 new Callable<LoaderStateMachine, OracleCommandExceptionMessage>
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158 (*this, &LoaderStateMachine::HandleExceptionMessage));
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159 }
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160
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161
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162 void LoaderStateMachine::SetSimultaneousDownloads(unsigned int count)
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163 {
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164 if (active_)
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165 {
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166 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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167 }
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168 else if (count == 0)
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169 {
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170 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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171 }
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172 else
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173 {
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174 simultaneousDownloads_ = count;
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175 }
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176 }
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177 }