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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "../PrecompiledHeaders.h"
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34 #include "ThreadedCommandProcessor.h"
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35
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36 #include "../OrthancException.h"
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37
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38 namespace Orthanc
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39 {
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40 static const int32_t TIMEOUT = 10;
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41
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42
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43 void ThreadedCommandProcessor::Processor(ThreadedCommandProcessor* that)
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44 {
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45 while (!that->done_)
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46 {
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47 std::auto_ptr<IDynamicObject> command(that->queue_.Dequeue(TIMEOUT));
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48
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49 if (command.get() != NULL)
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50 {
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51 bool success = false;
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52
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53 try
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54 {
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55 if (that->success_)
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56 {
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57 // No command has failed so far
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58
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59 if (that->cancel_)
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60 {
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61 // The commands have been canceled. Skip the execution
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62 // of this command, yet mark it as succeeded.
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63 success = true;
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64 }
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65 else
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66 {
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67 success = dynamic_cast<ICommand&>(*command).Execute();
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68 }
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69 }
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70 else
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71 {
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72 // A command has already failed. Skip the execution of this command.
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73 }
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74 }
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75 catch (OrthancException)
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76 {
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77 }
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78
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79 {
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80 boost::mutex::scoped_lock lock(that->mutex_);
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81 assert(that->remainingCommands_ > 0);
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82 that->remainingCommands_--;
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83
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84 if (!success)
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85 {
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86 if (!that->cancel_ && that->listener_ && that->success_)
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87 {
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88 // This is the first command that fails
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89 that->listener_->SignalFailure();
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90 }
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91
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92 that->success_ = false;
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93 }
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94 else
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95 {
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96 if (!that->cancel_ && that->listener_)
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97 {
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98 if (that->remainingCommands_ == 0)
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99 {
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100 that->listener_->SignalSuccess(that->totalCommands_);
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101 }
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102 else
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103 {
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104 that->listener_->SignalProgress(that->totalCommands_ - that->remainingCommands_,
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105 that->totalCommands_);
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106 }
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107 }
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108 }
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109
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110 that->processedCommand_.notify_all();
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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 ThreadedCommandProcessor::ThreadedCommandProcessor(unsigned int numThreads)
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118 {
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119 if (numThreads < 1)
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120 {
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121 throw OrthancException(ErrorCode_ParameterOutOfRange);
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122 }
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123
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124 listener_ = NULL;
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125 success_ = true;
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126 done_ = false;
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127 cancel_ = false;
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128 threads_.resize(numThreads);
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129 remainingCommands_ = 0;
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130 totalCommands_ = 0;
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131
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132 for (unsigned int i = 0; i < numThreads; i++)
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133 {
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134 threads_[i] = new boost::thread(Processor, this);
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135 }
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136 }
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137
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138
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139 ThreadedCommandProcessor::~ThreadedCommandProcessor()
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140 {
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141 done_ = true;
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142
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143 for (unsigned int i = 0; i < threads_.size(); i++)
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144 {
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145 boost::thread* t = threads_[i];
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146
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147 if (t != NULL)
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148 {
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149 if (t->joinable())
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150 {
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151 t->join();
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152 }
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153
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154 delete t;
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155 }
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156 }
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157 }
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158
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159
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160 void ThreadedCommandProcessor::Post(ICommand* command)
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161 {
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162 if (command == NULL)
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163 {
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164 throw OrthancException(ErrorCode_ParameterOutOfRange);
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165 }
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166
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167 boost::mutex::scoped_lock lock(mutex_);
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168 queue_.Enqueue(command);
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169 remainingCommands_++;
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170 totalCommands_++;
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171 }
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172
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173
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174 bool ThreadedCommandProcessor::Join()
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175 {
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176 boost::mutex::scoped_lock lock(mutex_);
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177
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178 while (remainingCommands_ != 0)
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179 {
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180 processedCommand_.wait(lock);
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181 }
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182
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183 if (cancel_ && listener_)
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184 {
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185 listener_->SignalCancel();
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186 }
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187
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188 // Reset the sequence counters for subsequent commands
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189 bool hasSucceeded = success_;
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190 success_ = true;
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191 totalCommands_ = 0;
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192 cancel_ = false;
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193
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194 return hasSucceeded;
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195 }
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196
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197
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198 void ThreadedCommandProcessor::Cancel()
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199 {
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200 boost::mutex::scoped_lock lock(mutex_);
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201
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202 cancel_ = true;
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203 }
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204
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205
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206 void ThreadedCommandProcessor::SetListener(IListener& listener)
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207 {
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208 boost::mutex::scoped_lock lock(mutex_);
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209 listener_ = &listener;
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210 }
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211 }
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