annotate OrthancFramework/Sources/MultiThreading/RunnableWorkersPool.cpp @ 4764:cc02a2aa8bab

integration Orthanc-1.9.6->mainline
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 09 Aug 2021 08:50:04 +0200
parents d9473bd5ed43
children 7053502fbf97
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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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) 2017-2021 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 Lesser 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 * Lesser 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 Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "RunnableWorkersPool.h"
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25
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26 #include "SharedMessageQueue.h"
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27 #include "../Compatibility.h"
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28 #include "../OrthancException.h"
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29 #include "../Logging.h"
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30
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31 namespace Orthanc
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32 {
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33 struct RunnableWorkersPool::PImpl
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34 {
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35 class Worker
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36 {
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37 private:
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38 const bool& continue_;
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39 SharedMessageQueue& queue_;
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40 boost::thread thread_;
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41
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42 static void WorkerThread(Worker* that)
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43 {
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44 while (that->continue_)
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45 {
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46 try
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47 {
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48 std::unique_ptr<IDynamicObject> obj(that->queue_.Dequeue(100));
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49 if (obj.get() != NULL)
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50 {
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51 IRunnableBySteps& runnable = *dynamic_cast<IRunnableBySteps*>(obj.get());
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52
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53 bool wishToContinue = runnable.Step();
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54
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55 if (wishToContinue)
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56 {
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57 // The runnable wishes to continue, reinsert it at the beginning of the queue
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58 that->queue_.Enqueue(obj.release());
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59 }
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60 }
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61 }
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62 catch (OrthancException& e)
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63 {
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64 LOG(ERROR) << "Exception while handling some runnable object: " << e.What();
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65 }
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66 catch (std::bad_alloc&)
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67 {
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68 LOG(ERROR) << "Not enough memory to handle some runnable object";
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69 }
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70 catch (std::exception& e)
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71 {
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72 LOG(ERROR) << "std::exception while handling some runnable object: " << e.what();
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73 }
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74 catch (...)
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75 {
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76 LOG(ERROR) << "Native exception while handling some runnable object";
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77 }
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78 }
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79 }
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80
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81 public:
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82 Worker(const bool& globalContinue,
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83 SharedMessageQueue& queue) :
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84 continue_(globalContinue),
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85 queue_(queue)
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86 {
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87 thread_ = boost::thread(WorkerThread, this);
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88 }
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89
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90 void Join()
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91 {
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92 if (thread_.joinable())
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93 {
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94 thread_.join();
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95 }
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96 }
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97 };
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98
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99
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100 bool continue_;
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101 std::vector<Worker*> workers_;
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102 SharedMessageQueue queue_;
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103 };
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104
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105
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106
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107 RunnableWorkersPool::RunnableWorkersPool(size_t countWorkers) : pimpl_(new PImpl)
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108 {
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109 pimpl_->continue_ = true;
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110
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111 if (countWorkers == 0)
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112 {
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113 throw OrthancException(ErrorCode_ParameterOutOfRange);
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114 }
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115
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116 pimpl_->workers_.resize(countWorkers);
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117
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118 for (size_t i = 0; i < countWorkers; i++)
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119 {
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120 pimpl_->workers_[i] = new PImpl::Worker(pimpl_->continue_, pimpl_->queue_);
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121 }
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122 }
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123
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124
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125 void RunnableWorkersPool::Stop()
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126 {
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127 if (pimpl_->continue_)
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128 {
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129 pimpl_->continue_ = false;
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130
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131 for (size_t i = 0; i < pimpl_->workers_.size(); i++)
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132 {
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133 PImpl::Worker* worker = pimpl_->workers_[i];
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134
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135 if (worker != NULL)
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136 {
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137 worker->Join();
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138 delete worker;
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139 }
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140 }
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141 }
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142 }
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144
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145 RunnableWorkersPool::~RunnableWorkersPool()
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146 {
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147 Stop();
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148 }
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150
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151 void RunnableWorkersPool::Add(IRunnableBySteps* runnable)
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152 {
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153 if (!pimpl_->continue_)
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154 {
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155 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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156 }
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158 pimpl_->queue_.Enqueue(runnable);
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159 }
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160 }