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annotate OrthancFramework/Sources/MultiThreading/SharedMessageQueue.cpp @ 5676:b744a2cf408a find-refactoring tip

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shorten ParentRetrieveSpecification/ChildrenRetrieveSpecification as ParentSpecification/ChildrenSpecification
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 06 Jul 2024 15:04:28 +0200
parents f7adfb22e20e
children
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Lesser General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Lesser General Public
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20 * License along with this program. If not, see
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21 * <http://www.gnu.org/licenses/>.
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22 **/
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23
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24
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25 #include "../PrecompiledHeaders.h"
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26 #include "SharedMessageQueue.h"
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29 #include "../Compatibility.h"
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31
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32 /**
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33 * FIFO (queue):
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34 *
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35 * back front
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36 * +--+--+--+--+--+--+--+--+--+--+--+
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37 * Enqueue -> | | | | | | | | | | | |
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38 * | | | | | | | | | | | | -> Dequeue
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39 * +--+--+--+--+--+--+--+--+--+--+--+
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40 * ^
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41 * |
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42 * Make room here
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43 *
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44 *
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45 * LIFO (stack):
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46 *
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47 * back front
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48 * +--+--+--+--+--+--+--+--+--+--+--+
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49 * | | | | | | | | | | | | <- Enqueue
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50 * | | | | | | | | | | | | -> Dequeue
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51 * +--+--+--+--+--+--+--+--+--+--+--+
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52 * ^
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53 * |
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54 * Make room here
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55 **/
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56
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57
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58 namespace Orthanc
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59 {
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60 SharedMessageQueue::SharedMessageQueue(unsigned int maxSize) :
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61 isFifo_(true),
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62 maxSize_(maxSize)
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63 {
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64 }
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65
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66
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67 SharedMessageQueue::~SharedMessageQueue()
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68 {
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69 for (Queue::iterator it = queue_.begin(); it != queue_.end(); ++it)
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70 {
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71 delete *it;
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72 }
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73 }
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74
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75
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76 void SharedMessageQueue::Enqueue(IDynamicObject* message)
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77 {
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78 boost::mutex::scoped_lock lock(mutex_);
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79
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80 if (maxSize_ != 0 && queue_.size() > maxSize_)
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81 {
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82 if (isFifo_)
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83 {
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84 // Too many elements in the queue: Make room
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85 delete queue_.front();
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86 queue_.pop_front();
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87 }
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88 else
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89 {
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90 // Too many elements in the stack: Make room
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91 delete queue_.back();
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92 queue_.pop_back();
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93 }
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94 }
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95
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96 if (isFifo_)
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97 {
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98 // Queue policy (FIFO)
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99 queue_.push_back(message);
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100 }
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101 else
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102 {
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103 // Stack policy (LIFO)
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104 queue_.push_front(message);
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105 }
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106
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107 elementAvailable_.notify_one();
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108 }
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109
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110
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111 IDynamicObject* SharedMessageQueue::Dequeue(int32_t millisecondsTimeout)
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112 {
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113 boost::mutex::scoped_lock lock(mutex_);
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114
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115 // Wait for a message to arrive in the FIFO queue
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116 while (queue_.empty())
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117 {
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118 if (millisecondsTimeout == 0)
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119 {
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120 elementAvailable_.wait(lock);
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121 }
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122 else
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123 {
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124 bool success = elementAvailable_.timed_wait
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125 (lock, boost::posix_time::milliseconds(millisecondsTimeout));
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126 if (!success)
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127 {
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128 return NULL;
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129 }
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130 }
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131 }
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132
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133 std::unique_ptr<IDynamicObject> message(queue_.front());
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134 queue_.pop_front();
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135
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136 if (queue_.empty())
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137 {
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138 emptied_.notify_all();
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139 }
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140
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141 return message.release();
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142 }
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143
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144
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145
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146 bool SharedMessageQueue::WaitEmpty(int32_t millisecondsTimeout)
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147 {
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148 boost::mutex::scoped_lock lock(mutex_);
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149
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150 // Wait for the queue to become empty
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151 while (!queue_.empty())
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152 {
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153 if (millisecondsTimeout == 0)
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154 {
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155 emptied_.wait(lock);
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156 }
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157 else
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158 {
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159 if (!emptied_.timed_wait
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160 (lock, boost::posix_time::milliseconds(millisecondsTimeout)))
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161 {
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162 return false;
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163 }
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164 }
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165 }
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166
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167 return true;
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168 }
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169
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170 bool SharedMessageQueue::IsFifoPolicy() const
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171 {
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172 return isFifo_;
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173 }
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174
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175 bool SharedMessageQueue::IsLifoPolicy() const
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176 {
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177 return !isFifo_;
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178 }
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179
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180
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181 void SharedMessageQueue::SetFifoPolicy()
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182 {
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183 boost::mutex::scoped_lock lock(mutex_);
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184 isFifo_ = true;
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185 }
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186
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187 void SharedMessageQueue::SetLifoPolicy()
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188 {
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189 boost::mutex::scoped_lock lock(mutex_);
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190 isFifo_ = false;
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191 }
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192
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193 void SharedMessageQueue::Clear()
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194 {
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195 boost::mutex::scoped_lock lock(mutex_);
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196
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197 if (queue_.empty())
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198 {
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199 return;
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200 }
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201 else
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202 {
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203 while (!queue_.empty())
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204 {
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205 std::unique_ptr<IDynamicObject> message(queue_.front());
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206 queue_.pop_front();
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207 }
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208
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209 emptied_.notify_all();
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210 }
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211 }
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212
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213 size_t SharedMessageQueue::GetSize()
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214 {
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215 boost::mutex::scoped_lock lock(mutex_);
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216 return queue_.size();
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217 }
450
58b433bb9762 SharedMessageQueue
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218 }