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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 Osimis, 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 "Oracle.h"
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23
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24 #include "../../Resources/Orthanc/Core/Logging.h"
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25 #include "../../Resources/Orthanc/Core/MultiThreading/SharedMessageQueue.h"
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26 #include "../../Resources/Orthanc/Core/OrthancException.h"
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27
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28 #include <vector>
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29
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30 namespace OrthancStone
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31 {
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32 class Oracle::PImpl
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33 {
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34 private:
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35 enum State
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36 {
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37 State_Init,
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38 State_Started,
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39 State_Stopped
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40 };
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41
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42 boost::mutex* globalMutex_;
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43 boost::mutex oracleMutex_;
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44 State state_;
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45 std::vector<boost::thread*> threads_;
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46 Orthanc::SharedMessageQueue queue_;
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47
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48 static void Worker(PImpl* that)
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49 {
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50 for (;;)
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51 {
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52 State state;
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53
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54 {
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55 boost::mutex::scoped_lock lock(that->oracleMutex_);
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56 state = that->state_;
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57 }
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58
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59 if (state == State_Stopped)
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60 {
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61 break;
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62 }
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63
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64 std::auto_ptr<Orthanc::IDynamicObject> item(that->queue_.Dequeue(100));
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65 if (item.get() != NULL)
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66 {
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67 IOracleCommand& command = dynamic_cast<IOracleCommand&>(*item);
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68 command.Execute();
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69
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70 if (that->globalMutex_ != NULL)
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71 {
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72 boost::mutex::scoped_lock lock(*that->globalMutex_);
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73 command.Commit();
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74 }
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75 else
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76 {
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77 command.Commit();
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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
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83 public:
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84 PImpl(boost::mutex* globalMutex,
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85 unsigned int threadCount) :
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86 globalMutex_(globalMutex),
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87 state_(State_Init),
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88 threads_(threadCount)
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89 {
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90 }
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91
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92 ~PImpl()
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93 {
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94 if (state_ == State_Started)
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95 {
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96 LOG(ERROR) << "You should have manually called Oracle::Stop()";
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97 Stop();
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98 }
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99 }
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100
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101 void Submit(IOracleCommand* command)
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102 {
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103 std::auto_ptr<IOracleCommand> protection(command);
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104
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105 if (command == NULL)
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106 {
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107 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
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108 }
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109
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110 boost::mutex::scoped_lock lock(oracleMutex_);
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111
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112 switch (state_)
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113 {
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114 case State_Init:
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115 case State_Started:
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116 queue_.Enqueue(protection.release());
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117 break;
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118
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119 case State_Stopped:
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120 LOG(ERROR) << "Cannot schedule a request to the Oracle after having "
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121 << "called Oracle::Stop()";
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122 break;
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123
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124 default:
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125 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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126 }
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127
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128 }
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129
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130 void Start()
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131 {
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132 boost::mutex::scoped_lock lock(oracleMutex_);
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133
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134 if (state_ != State_Init)
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135 {
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136 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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137 }
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138
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139 for (size_t i = 0; i < threads_.size(); i++)
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140 {
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141 threads_[i] = new boost::thread(Worker, this);
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142 }
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143
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144 state_ = State_Started;
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145 }
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146
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147 void Stop()
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148 {
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149 {
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150 boost::mutex::scoped_lock lock(oracleMutex_);
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151
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152 if (state_ != State_Started)
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153 {
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154 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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155 }
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156
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157 state_ = State_Stopped;
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158 }
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159
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160 for (size_t i = 0; i < threads_.size(); i++)
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161 {
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162 if (threads_[i] != NULL)
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163 {
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164 if (threads_[i]->joinable())
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165 {
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166 threads_[i]->join();
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167 }
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168
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169 delete threads_[i];
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170 }
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171 }
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172 }
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173 };
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174
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175
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176 Oracle::Oracle(boost::mutex& globalMutex,
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177 unsigned int threadCount) :
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178 pimpl_(new PImpl(&globalMutex, threadCount))
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179 {
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180 }
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181
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182
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183 Oracle::Oracle(unsigned int threadCount) :
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184 pimpl_(new PImpl(NULL, threadCount))
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185 {
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186 }
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187
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188
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189 void Oracle::Start()
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190 {
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191 pimpl_->Start();
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192 }
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193
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194
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195 void Oracle::Submit(IOracleCommand* command)
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196 {
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197 pimpl_->Submit(command);
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198 }
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199
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200
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201 void Oracle::Stop()
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202 {
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203 pimpl_->Stop();
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204 }
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205 }
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