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annotate Core/Cache/MemoryObjectCache.cpp @ 3807:2f28c7eb2776

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fix civetweb 1.12 archive
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 02 Apr 2020 18:08:08 +0200
parents 2a170a8f1faf
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) 2017-2020 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 General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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32
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33
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34 #include "../PrecompiledHeaders.h"
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35 #include "MemoryObjectCache.h"
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36
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37 #include "../Compatibility.h"
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38
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39 namespace Orthanc
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40 {
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41 class MemoryObjectCache::Item : public boost::noncopyable
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42 {
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43 private:
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44 ICacheable* value_;
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45 boost::posix_time::ptime time_;
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46
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47 public:
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48 explicit Item(ICacheable* value) : // Takes ownership
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49 value_(value),
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50 time_(boost::posix_time::second_clock::local_time())
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51 {
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52 if (value == NULL)
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53 {
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54 throw OrthancException(ErrorCode_NullPointer);
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55 }
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56 }
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57
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58 ~Item()
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59 {
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60 assert(value_ != NULL);
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61 delete value_;
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62 }
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63
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64 ICacheable& GetValue() const
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65 {
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66 assert(value_ != NULL);
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67 return *value_;
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68 }
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69
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70 const boost::posix_time::ptime& GetTime() const
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71 {
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72 return time_;
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73 }
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74 };
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75
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76
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77 void MemoryObjectCache::Recycle(size_t targetSize)
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78 {
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79 // WARNING: "cacheMutex_" must be locked
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80 while (currentSize_ > targetSize)
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81 {
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82 assert(!content_.IsEmpty());
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83
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84 Item* item = NULL;
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85 content_.RemoveOldest(item);
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86
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87 assert(item != NULL);
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88 const size_t size = item->GetValue().GetMemoryUsage();
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89 delete item;
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90
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91 assert(currentSize_ >= size);
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92 currentSize_ -= size;
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93 }
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94
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95 // Post-condition: "currentSize_ <= targetSize"
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96 }
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97
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98
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99 MemoryObjectCache::MemoryObjectCache() :
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100 currentSize_(0),
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101 maxSize_(100 * 1024 * 1024) // 100 MB
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102 {
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103 }
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104
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105
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106 MemoryObjectCache::~MemoryObjectCache()
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107 {
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108 Recycle(0);
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109 assert(content_.IsEmpty());
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110 }
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111
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112
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113 size_t MemoryObjectCache::GetMaximumSize()
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114 {
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115 #if !defined(__EMSCRIPTEN__)
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116 boost::mutex::scoped_lock lock(cacheMutex_);
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117 #endif
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118
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119 return maxSize_;
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120 }
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121
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122
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123 void MemoryObjectCache::SetMaximumSize(size_t size)
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124 {
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125 if (size == 0)
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126 {
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127 throw OrthancException(ErrorCode_ParameterOutOfRange);
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128 }
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129
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130 #if !defined(__EMSCRIPTEN__)
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131 // Make sure no accessor is currently open (as its data may be
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132 // removed if recycling is needed)
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133 WriterLock contentLock(contentMutex_);
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134
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135 // Lock the global structure of the cache
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136 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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137 #endif
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138
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139 Recycle(size);
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140 maxSize_ = size;
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141 }
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142
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143
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144 void MemoryObjectCache::Acquire(const std::string& key,
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145 ICacheable* value)
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146 {
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147 std::unique_ptr<Item> item(new Item(value));
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148
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149 if (value == NULL)
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150 {
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151 throw OrthancException(ErrorCode_NullPointer);
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152 }
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153 else
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154 {
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155 #if !defined(__EMSCRIPTEN__)
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156 // Make sure no accessor is currently open (as its data may be
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157 // removed if recycling is needed)
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158 WriterLock contentLock(contentMutex_);
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159
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160 // Lock the global structure of the cache
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161 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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162 #endif
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163
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164 const size_t size = item->GetValue().GetMemoryUsage();
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165
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166 if (size > maxSize_)
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167 {
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168 // This object is too large to be stored in the cache, discard it
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169 }
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170 else if (content_.Contains(key))
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171 {
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172 // Value already stored, don't overwrite the old value
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173 content_.MakeMostRecent(key);
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174 }
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175 else
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176 {
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177 Recycle(maxSize_ - size); // Post-condition: currentSize_ <= maxSize_ - size
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178 assert(currentSize_ + size <= maxSize_);
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179
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180 content_.Add(key, item.release());
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181 currentSize_ += size;
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182 }
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183 }
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184 }
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185
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186
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187 void MemoryObjectCache::Invalidate(const std::string& key)
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188 {
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189 #if !defined(__EMSCRIPTEN__)
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190 // Make sure no accessor is currently open (as it may correspond
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191 // to the key to remove)
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192 WriterLock contentLock(contentMutex_);
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193
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194 // Lock the global structure of the cache
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195 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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196 #endif
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197
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198 Item* item = NULL;
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199 if (content_.Contains(key, item))
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200 {
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201 assert(item != NULL);
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202 const size_t size = item->GetValue().GetMemoryUsage();
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203 delete item;
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204
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205 content_.Invalidate(key);
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206
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207 assert(currentSize_ >= size);
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208 currentSize_ -= size;
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209 }
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210 }
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211
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212
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213 MemoryObjectCache::Accessor::Accessor(MemoryObjectCache& cache,
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214 const std::string& key,
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215 bool unique) :
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216 item_(NULL)
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217 {
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218 #if !defined(__EMSCRIPTEN__)
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219 if (unique)
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220 {
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221 writerLock_ = WriterLock(cache.contentMutex_);
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222 }
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223 else
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224 {
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225 readerLock_ = ReaderLock(cache.contentMutex_);
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226 }
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227
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228 // Lock the global structure of the cache, must be *after* the
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229 // reader/writer lock
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230 cacheLock_ = boost::mutex::scoped_lock(cache.cacheMutex_);
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231 #endif
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232
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233 if (cache.content_.Contains(key, item_))
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234 {
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235 cache.content_.MakeMostRecent(key);
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236 }
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237
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238 #if !defined(__EMSCRIPTEN__)
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239 cacheLock_.unlock();
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240
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241 if (item_ == NULL)
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242 {
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243 // This item does not exist in the cache, we can release the
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244 // reader/writer lock
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245 if (unique)
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246 {
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247 writerLock_.unlock();
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248 }
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249 else
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250 {
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251 readerLock_.unlock();
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252 }
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253 }
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254 #endif
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255 }
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256
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257
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258 ICacheable& MemoryObjectCache::Accessor::GetValue() const
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259 {
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260 if (IsValid())
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261 {
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262 return item_->GetValue();
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263 }
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264 else
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265 {
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266 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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267 }
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268 }
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269
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270
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271 const boost::posix_time::ptime& MemoryObjectCache::Accessor::GetTime() const
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272 {
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273 if (IsValid())
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274 {
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275 return item_->GetTime();
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276 }
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277 else
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278 {
4d809b2e1141 better cache toolbox: MemoryObjectCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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279 throw OrthancException(ErrorCode_BadSequenceOfCalls);
4d809b2e1141 better cache toolbox: MemoryObjectCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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280 }
4d809b2e1141 better cache toolbox: MemoryObjectCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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281 }
4d809b2e1141 better cache toolbox: MemoryObjectCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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282 }