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annotate OrthancFramework/Sources/MultiThreading/SharedMessageQueue.cpp @ 5185:0ea402b4d901

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 25 Mar 2023 12:27:21 +0100
parents 43e613a7756b
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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) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "../PrecompiledHeaders.h"
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25 #include "SharedMessageQueue.h"
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28 #include "../Compatibility.h"
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30
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31 /**
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32 * FIFO (queue):
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33 *
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34 * back front
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35 * +--+--+--+--+--+--+--+--+--+--+--+
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36 * Enqueue -> | | | | | | | | | | | |
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37 * | | | | | | | | | | | | -> Dequeue
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38 * +--+--+--+--+--+--+--+--+--+--+--+
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39 * ^
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40 * |
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41 * Make room here
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42 *
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43 *
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44 * LIFO (stack):
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45 *
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46 * back front
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47 * +--+--+--+--+--+--+--+--+--+--+--+
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48 * | | | | | | | | | | | | <- Enqueue
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49 * | | | | | | | | | | | | -> Dequeue
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50 * +--+--+--+--+--+--+--+--+--+--+--+
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51 * ^
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52 * |
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53 * Make room here
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54 **/
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55
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56
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57 namespace Orthanc
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58 {
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59 SharedMessageQueue::SharedMessageQueue(unsigned int maxSize) :
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60 isFifo_(true),
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61 maxSize_(maxSize)
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62 {
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63 }
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64
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65
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66 SharedMessageQueue::~SharedMessageQueue()
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67 {
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68 for (Queue::iterator it = queue_.begin(); it != queue_.end(); ++it)
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69 {
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70 delete *it;
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71 }
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72 }
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73
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74
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75 void SharedMessageQueue::Enqueue(IDynamicObject* message)
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76 {
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77 boost::mutex::scoped_lock lock(mutex_);
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78
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79 if (maxSize_ != 0 && queue_.size() > maxSize_)
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80 {
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81 if (isFifo_)
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82 {
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83 // Too many elements in the queue: Make room
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84 delete queue_.front();
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85 queue_.pop_front();
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86 }
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87 else
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88 {
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89 // Too many elements in the stack: Make room
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90 delete queue_.back();
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91 queue_.pop_back();
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92 }
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93 }
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94
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95 if (isFifo_)
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96 {
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97 // Queue policy (FIFO)
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98 queue_.push_back(message);
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99 }
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100 else
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101 {
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102 // Stack policy (LIFO)
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103 queue_.push_front(message);
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104 }
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105
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106 elementAvailable_.notify_one();
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107 }
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108
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109
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110 IDynamicObject* SharedMessageQueue::Dequeue(int32_t millisecondsTimeout)
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111 {
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112 boost::mutex::scoped_lock lock(mutex_);
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113
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114 // Wait for a message to arrive in the FIFO queue
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115 while (queue_.empty())
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116 {
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117 if (millisecondsTimeout == 0)
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118 {
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119 elementAvailable_.wait(lock);
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120 }
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121 else
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122 {
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123 bool success = elementAvailable_.timed_wait
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124 (lock, boost::posix_time::milliseconds(millisecondsTimeout));
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125 if (!success)
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126 {
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127 return NULL;
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128 }
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129 }
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130 }
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131
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132 std::unique_ptr<IDynamicObject> message(queue_.front());
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133 queue_.pop_front();
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134
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135 if (queue_.empty())
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136 {
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137 emptied_.notify_all();
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138 }
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139
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140 return message.release();
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141 }
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142
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143
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144
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145 bool SharedMessageQueue::WaitEmpty(int32_t millisecondsTimeout)
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146 {
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147 boost::mutex::scoped_lock lock(mutex_);
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148
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149 // Wait for the queue to become empty
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150 while (!queue_.empty())
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151 {
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152 if (millisecondsTimeout == 0)
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153 {
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154 emptied_.wait(lock);
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155 }
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156 else
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157 {
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158 if (!emptied_.timed_wait
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159 (lock, boost::posix_time::milliseconds(millisecondsTimeout)))
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160 {
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161 return false;
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162 }
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163 }
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164 }
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165
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166 return true;
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167 }
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168
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169 bool SharedMessageQueue::IsFifoPolicy() const
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170 {
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171 return isFifo_;
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172 }
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173
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174 bool SharedMessageQueue::IsLifoPolicy() const
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175 {
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176 return !isFifo_;
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177 }
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178
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179
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180 void SharedMessageQueue::SetFifoPolicy()
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181 {
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182 boost::mutex::scoped_lock lock(mutex_);
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183 isFifo_ = true;
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184 }
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185
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186 void SharedMessageQueue::SetLifoPolicy()
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187 {
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188 boost::mutex::scoped_lock lock(mutex_);
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189 isFifo_ = false;
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190 }
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191
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192 void SharedMessageQueue::Clear()
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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 if (queue_.empty())
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197 {
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198 return;
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199 }
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200 else
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201 {
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202 while (!queue_.empty())
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203 {
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204 std::unique_ptr<IDynamicObject> message(queue_.front());
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205 queue_.pop_front();
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206 }
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207
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208 emptied_.notify_all();
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209 }
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210 }
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211
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212 size_t SharedMessageQueue::GetSize()
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213 {
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214 boost::mutex::scoped_lock lock(mutex_);
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215 return queue_.size();
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216 }
450
58b433bb9762 SharedMessageQueue
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217 }