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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, 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 "../PrecompiledHeaders.h"
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34 #include "SharedMessageQueue.h"
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35
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36
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37
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38 /**
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39 * FIFO (queue):
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40 *
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41 * back front
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42 * +--+--+--+--+--+--+--+--+--+--+--+
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43 * Enqueue -> | | | | | | | | | | | |
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44 * | | | | | | | | | | | | -> Dequeue
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45 * +--+--+--+--+--+--+--+--+--+--+--+
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46 * ^
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47 * |
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48 * Make room here
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49 *
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50 *
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51 * LIFO (stack):
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52 *
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53 * back front
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54 * +--+--+--+--+--+--+--+--+--+--+--+
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55 * | | | | | | | | | | | | <- Enqueue
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56 * | | | | | | | | | | | | -> Dequeue
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57 * +--+--+--+--+--+--+--+--+--+--+--+
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58 * ^
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59 * |
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60 * Make room here
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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 namespace Orthanc
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66 {
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67 SharedMessageQueue::SharedMessageQueue(unsigned int maxSize) :
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68 isFifo_(true),
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69 maxSize_(maxSize)
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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 SharedMessageQueue::~SharedMessageQueue()
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75 {
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76 for (Queue::iterator it = queue_.begin(); it != queue_.end(); ++it)
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77 {
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78 delete *it;
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79 }
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80 }
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81
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82
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83 void SharedMessageQueue::Enqueue(IDynamicObject* message)
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84 {
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85 boost::mutex::scoped_lock lock(mutex_);
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86
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87 if (maxSize_ != 0 && queue_.size() > maxSize_)
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88 {
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89 if (isFifo_)
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90 {
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91 // Too many elements in the queue: Make room
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92 delete queue_.front();
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93 queue_.pop_front();
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94 }
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95 else
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96 {
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97 // Too many elements in the stack: Make room
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98 delete queue_.back();
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99 queue_.pop_back();
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100 }
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101 }
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102
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103 if (isFifo_)
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104 {
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105 // Queue policy (FIFO)
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106 queue_.push_back(message);
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107 }
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108 else
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109 {
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110 // Stack policy (LIFO)
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111 queue_.push_front(message);
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112 }
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113
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114 elementAvailable_.notify_one();
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115 }
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116
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117
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118 IDynamicObject* SharedMessageQueue::Dequeue(int32_t millisecondsTimeout)
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119 {
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120 boost::mutex::scoped_lock lock(mutex_);
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121
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122 // Wait for a message to arrive in the FIFO queue
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123 while (queue_.empty())
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124 {
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125 if (millisecondsTimeout == 0)
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126 {
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127 elementAvailable_.wait(lock);
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128 }
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129 else
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130 {
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131 bool success = elementAvailable_.timed_wait
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132 (lock, boost::posix_time::milliseconds(millisecondsTimeout));
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133 if (!success)
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134 {
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135 return NULL;
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136 }
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137 }
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138 }
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139
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140 std::auto_ptr<IDynamicObject> message(queue_.front());
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141 queue_.pop_front();
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142
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143 if (queue_.empty())
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144 {
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145 emptied_.notify_all();
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146 }
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147
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148 return message.release();
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149 }
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150
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151
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152
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153 bool SharedMessageQueue::WaitEmpty(int32_t millisecondsTimeout)
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154 {
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155 boost::mutex::scoped_lock lock(mutex_);
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156
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157 // Wait for the queue to become empty
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158 while (!queue_.empty())
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159 {
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160 if (millisecondsTimeout == 0)
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161 {
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162 emptied_.wait(lock);
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163 }
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164 else
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165 {
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166 if (!emptied_.timed_wait
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167 (lock, boost::posix_time::milliseconds(millisecondsTimeout)))
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168 {
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169 return false;
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170 }
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171 }
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172 }
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173
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174 return true;
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175 }
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176
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177
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178 void SharedMessageQueue::SetFifoPolicy()
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179 {
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180 boost::mutex::scoped_lock lock(mutex_);
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181 isFifo_ = true;
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182 }
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183
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184 void SharedMessageQueue::SetLifoPolicy()
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185 {
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186 boost::mutex::scoped_lock lock(mutex_);
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187 isFifo_ = false;
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188 }
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189 }
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