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annotate OrthancFramework/Sources/MultiThreading/SharedMessageQueue.cpp @ 4224:38d446c9ee1d

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 30 Sep 2020 17:59:09 +0200
parents e8005a58de16
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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) 2017-2020 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 "SharedMessageQueue.h"
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26
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27 #include "../Compatibility.h"
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29
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30 /**
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31 * FIFO (queue):
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32 *
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33 * back front
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34 * +--+--+--+--+--+--+--+--+--+--+--+
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35 * Enqueue -> | | | | | | | | | | | |
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36 * | | | | | | | | | | | | -> Dequeue
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37 * +--+--+--+--+--+--+--+--+--+--+--+
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38 * ^
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39 * |
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40 * Make room here
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41 *
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42 *
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43 * LIFO (stack):
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44 *
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45 * back front
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46 * +--+--+--+--+--+--+--+--+--+--+--+
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47 * | | | | | | | | | | | | <- Enqueue
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48 * | | | | | | | | | | | | -> Dequeue
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49 * +--+--+--+--+--+--+--+--+--+--+--+
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50 * ^
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51 * |
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52 * Make room here
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53 **/
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54
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55
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56 namespace Orthanc
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57 {
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58 SharedMessageQueue::SharedMessageQueue(unsigned int maxSize) :
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59 isFifo_(true),
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60 maxSize_(maxSize)
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61 {
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62 }
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63
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64
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65 SharedMessageQueue::~SharedMessageQueue()
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66 {
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67 for (Queue::iterator it = queue_.begin(); it != queue_.end(); ++it)
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68 {
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69 delete *it;
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70 }
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71 }
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72
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73
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74 void SharedMessageQueue::Enqueue(IDynamicObject* message)
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75 {
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76 boost::mutex::scoped_lock lock(mutex_);
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77
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78 if (maxSize_ != 0 && queue_.size() > maxSize_)
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79 {
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80 if (isFifo_)
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81 {
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82 // Too many elements in the queue: Make room
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83 delete queue_.front();
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84 queue_.pop_front();
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85 }
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86 else
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87 {
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88 // Too many elements in the stack: Make room
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89 delete queue_.back();
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90 queue_.pop_back();
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91 }
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92 }
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93
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94 if (isFifo_)
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95 {
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96 // Queue policy (FIFO)
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97 queue_.push_back(message);
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98 }
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99 else
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100 {
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101 // Stack policy (LIFO)
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102 queue_.push_front(message);
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103 }
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104
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105 elementAvailable_.notify_one();
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106 }
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107
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108
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109 IDynamicObject* SharedMessageQueue::Dequeue(int32_t millisecondsTimeout)
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110 {
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111 boost::mutex::scoped_lock lock(mutex_);
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112
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113 // Wait for a message to arrive in the FIFO queue
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114 while (queue_.empty())
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115 {
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116 if (millisecondsTimeout == 0)
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117 {
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118 elementAvailable_.wait(lock);
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119 }
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120 else
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121 {
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122 bool success = elementAvailable_.timed_wait
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123 (lock, boost::posix_time::milliseconds(millisecondsTimeout));
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124 if (!success)
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125 {
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126 return NULL;
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127 }
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128 }
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129 }
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130
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131 std::unique_ptr<IDynamicObject> message(queue_.front());
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132 queue_.pop_front();
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133
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134 if (queue_.empty())
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135 {
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136 emptied_.notify_all();
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137 }
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138
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139 return message.release();
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140 }
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141
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142
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143
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144 bool SharedMessageQueue::WaitEmpty(int32_t millisecondsTimeout)
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145 {
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146 boost::mutex::scoped_lock lock(mutex_);
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147
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148 // Wait for the queue to become empty
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149 while (!queue_.empty())
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150 {
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151 if (millisecondsTimeout == 0)
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152 {
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153 emptied_.wait(lock);
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154 }
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155 else
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156 {
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157 if (!emptied_.timed_wait
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158 (lock, boost::posix_time::milliseconds(millisecondsTimeout)))
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159 {
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160 return false;
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161 }
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162 }
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163 }
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164
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165 return true;
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166 }
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167
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168
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169 void SharedMessageQueue::SetFifoPolicy()
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170 {
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171 boost::mutex::scoped_lock lock(mutex_);
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172 isFifo_ = true;
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173 }
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174
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175 void SharedMessageQueue::SetLifoPolicy()
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176 {
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177 boost::mutex::scoped_lock lock(mutex_);
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178 isFifo_ = false;
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179 }
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180
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181 void SharedMessageQueue::Clear()
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182 {
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183 boost::mutex::scoped_lock lock(mutex_);
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184
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185 if (queue_.empty())
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186 {
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187 return;
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188 }
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189 else
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190 {
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191 while (!queue_.empty())
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192 {
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193 std::unique_ptr<IDynamicObject> message(queue_.front());
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194 queue_.pop_front();
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195 }
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196
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197 emptied_.notify_all();
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198 }
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199 }
4169
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200
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201 size_t SharedMessageQueue::GetSize()
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202 {
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203 boost::mutex::scoped_lock lock(mutex_);
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204 return queue_.size();
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205 }
450
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206 }