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annotate Core/MultiThreading/ThreadedCommandProcessor.cpp @ 689:2d0a347e8cfc

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 03 Feb 2014 16:06:58 +0100
parents 322c1b497036
children 0da078f3affc
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
689
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3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
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4 * 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 "ThreadedCommandProcessor.h"
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34
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35 #include "../OrthancException.h"
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36
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37 namespace Orthanc
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38 {
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39 static const int32_t TIMEOUT = 10;
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40
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41
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42 void ThreadedCommandProcessor::Processor(ThreadedCommandProcessor* that)
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43 {
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44 while (!that->done_)
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45 {
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46 std::auto_ptr<IDynamicObject> command(that->queue_.Dequeue(TIMEOUT));
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47
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48 if (command.get() != NULL)
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49 {
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50 bool success = false;
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51
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52 try
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53 {
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54 if (that->success_)
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55 {
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56 // No command has failed so far
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57
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58 if (that->cancel_)
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59 {
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60 // The commands have been canceled. Skip the execution
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61 // of this command, yet mark it as succeeded.
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62 success = true;
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63 }
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64 else
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65 {
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66 success = dynamic_cast<ICommand&>(*command).Execute();
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67 }
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68 }
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69 else
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70 {
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71 // A command has already failed. Skip the execution of this command.
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72 }
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73 }
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74 catch (OrthancException)
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75 {
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76 }
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77
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78 {
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79 boost::mutex::scoped_lock lock(that->mutex_);
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80 assert(that->remainingCommands_ > 0);
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81 that->remainingCommands_--;
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82
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83 if (!success)
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84 {
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85 if (!that->cancel_ && that->listener_ && that->success_)
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86 {
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87 // This is the first command that fails
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88 that->listener_->SignalFailure();
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89 }
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90
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91 that->success_ = false;
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92 }
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93 else
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94 {
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95 if (!that->cancel_ && that->listener_)
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96 {
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97 if (that->remainingCommands_ == 0)
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98 {
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99 that->listener_->SignalSuccess(that->totalCommands_);
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100 }
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101 else
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102 {
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103 that->listener_->SignalProgress(that->totalCommands_ - that->remainingCommands_,
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104 that->totalCommands_);
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105 }
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106 }
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107 }
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108
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109 that->processedCommand_.notify_all();
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110 }
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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 ThreadedCommandProcessor::ThreadedCommandProcessor(unsigned int numThreads)
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117 {
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118 if (numThreads < 1)
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119 {
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120 throw OrthancException(ErrorCode_ParameterOutOfRange);
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121 }
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122
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123 listener_ = NULL;
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124 success_ = true;
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125 done_ = false;
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126 cancel_ = false;
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127 threads_.resize(numThreads);
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128 remainingCommands_ = 0;
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129 totalCommands_ = 0;
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130
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131 for (unsigned int i = 0; i < numThreads; i++)
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132 {
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133 threads_[i] = new boost::thread(Processor, this);
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134 }
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135 }
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136
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137
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138 ThreadedCommandProcessor::~ThreadedCommandProcessor()
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139 {
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140 done_ = true;
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141
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142 for (unsigned int i = 0; i < threads_.size(); i++)
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143 {
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144 boost::thread* t = threads_[i];
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145
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146 if (t != NULL)
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147 {
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148 if (t->joinable())
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149 {
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150 t->join();
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151 }
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152
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153 delete t;
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154 }
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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 void ThreadedCommandProcessor::Post(ICommand* command)
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160 {
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161 boost::mutex::scoped_lock lock(mutex_);
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162 queue_.Enqueue(command);
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163 remainingCommands_++;
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164 totalCommands_++;
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165 }
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166
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167
466
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168 bool ThreadedCommandProcessor::Join()
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169 {
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170 boost::mutex::scoped_lock lock(mutex_);
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171
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172 while (!remainingCommands_ == 0)
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173 {
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174 processedCommand_.wait(lock);
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175 }
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176
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177 if (cancel_ && listener_)
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178 {
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179 listener_->SignalCancel();
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180 }
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181
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182 // Reset the sequence counters for subsequent commands
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183 bool hasSucceeded = success_;
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184 success_ = true;
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185 totalCommands_ = 0;
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186 cancel_ = false;
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187
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188 return hasSucceeded;
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189 }
467
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190
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191
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192 void ThreadedCommandProcessor::Cancel()
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193 {
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194 boost::mutex::scoped_lock lock(mutex_);
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195
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196 cancel_ = true;
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197 }
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198
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199
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200 void ThreadedCommandProcessor::SetListener(IListener& listener)
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201 {
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202 boost::mutex::scoped_lock lock(mutex_);
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203 listener_ = &listener;
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204 }
458
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205 }