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annotate Core/Cache/MemoryObjectCache.cpp @ 3569:367a3afa05a7

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note about OrthancPluginStorageRead()
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 13 Nov 2019 11:56:39 +0100
parents 4812825e69fc
children 94f4a18a79cc
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3557
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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) 2017-2019 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 namespace Orthanc
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38 {
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39 class MemoryObjectCache::Item : public boost::noncopyable
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40 {
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41 private:
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42 ICacheable* value_;
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43 boost::posix_time::ptime time_;
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44
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45 public:
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46 explicit Item(ICacheable* value) : // Takes ownership
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47 value_(value),
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48 time_(boost::posix_time::second_clock::local_time())
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49 {
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50 if (value == NULL)
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51 {
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52 throw OrthancException(ErrorCode_NullPointer);
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53 }
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54 }
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55
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56 ~Item()
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57 {
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58 assert(value_ != NULL);
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59 delete value_;
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60 }
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61
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62 ICacheable& GetValue() const
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63 {
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64 assert(value_ != NULL);
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65 return *value_;
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66 }
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67
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68 const boost::posix_time::ptime& GetTime() const
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69 {
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70 return time_;
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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 MemoryObjectCache::Recycle(size_t targetSize)
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76 {
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77 // WARNING: "cacheMutex_" must be locked
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78 while (currentSize_ > targetSize)
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79 {
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80 assert(!content_.IsEmpty());
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81
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82 Item* item = NULL;
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83 content_.RemoveOldest(item);
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84
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85 assert(item != NULL);
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86 const size_t size = item->GetValue().GetMemoryUsage();
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87 delete item;
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88
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89 assert(currentSize_ >= size);
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90 currentSize_ -= size;
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91 }
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92
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93 // Post-condition: "currentSize_ <= targetSize"
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94 }
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95
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96
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97 MemoryObjectCache::MemoryObjectCache() :
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98 currentSize_(0),
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99 maxSize_(100 * 1024 * 1024) // 100 MB
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100 {
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101 }
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102
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103
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104 MemoryObjectCache::~MemoryObjectCache()
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105 {
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106 Recycle(0);
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107 assert(content_.IsEmpty());
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108 }
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109
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110
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111 size_t MemoryObjectCache::GetMaximumSize()
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112 {
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113 #if !defined(__EMSCRIPTEN__)
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114 boost::mutex::scoped_lock lock(cacheMutex_);
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115 #endif
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116
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117 return maxSize_;
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118 }
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119
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120
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121 void MemoryObjectCache::SetMaximumSize(size_t size)
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122 {
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123 if (size == 0)
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124 {
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125 throw OrthancException(ErrorCode_ParameterOutOfRange);
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126 }
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127
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128 #if !defined(__EMSCRIPTEN__)
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129 // Make sure no accessor is currently open (as its data may be
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130 // removed if recycling is needed)
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131 WriterLock contentLock(contentMutex_);
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132
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133 // Lock the global structure of the cache
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134 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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135 #endif
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136
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137 Recycle(size);
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138 maxSize_ = size;
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139 }
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140
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141
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142 void MemoryObjectCache::Acquire(const std::string& key,
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143 ICacheable* value)
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144 {
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145 std::auto_ptr<Item> item(new Item(value));
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146
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147 if (value == NULL)
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148 {
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149 throw OrthancException(ErrorCode_NullPointer);
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150 }
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151 else
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152 {
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153 #if !defined(__EMSCRIPTEN__)
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154 // Make sure no accessor is currently open (as its data may be
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155 // removed if recycling is needed)
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156 WriterLock contentLock(contentMutex_);
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157
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158 // Lock the global structure of the cache
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159 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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160 #endif
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161
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162 const size_t size = item->GetValue().GetMemoryUsage();
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163
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164 if (size > maxSize_)
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165 {
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166 // This object is too large to be stored in the cache, discard it
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167 }
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168 else if (content_.Contains(key))
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169 {
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170 // Value already stored, don't overwrite the old value
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171 content_.MakeMostRecent(key);
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172 }
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173 else
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174 {
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175 Recycle(maxSize_ - size); // Post-condition: currentSize_ <= maxSize_ - size
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176 assert(currentSize_ + size <= maxSize_);
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177
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178 content_.Add(key, item.release());
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179 currentSize_ += size;
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180 }
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181 }
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182 }
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183
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184
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185 void MemoryObjectCache::Invalidate(const std::string& key)
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186 {
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187 #if !defined(__EMSCRIPTEN__)
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188 // Make sure no accessor is currently open (as it may correspond
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189 // to the key to remove)
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190 WriterLock contentLock(contentMutex_);
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191
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192 // Lock the global structure of the cache
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193 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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194 #endif
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195
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196 Item* item = NULL;
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197 if (content_.Contains(key, item))
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198 {
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199 assert(item != NULL);
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200 const size_t size = item->GetValue().GetMemoryUsage();
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201 delete item;
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202
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203 content_.Invalidate(key);
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204
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205 assert(currentSize_ >= size);
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206 currentSize_ -= size;
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207 }
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208 }
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209
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210
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211 MemoryObjectCache::Accessor::Accessor(MemoryObjectCache& cache,
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212 const std::string& key,
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213 bool unique) :
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214 item_(NULL)
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215 {
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216 #if !defined(__EMSCRIPTEN__)
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217 if (unique)
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218 {
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219 writerLock_ = WriterLock(cache.contentMutex_);
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220 }
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221 else
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222 {
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223 readerLock_ = ReaderLock(cache.contentMutex_);
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224 }
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225
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226 // Lock the global structure of the cache, must be *after* the
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227 // reader/writer lock
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228 cacheLock_ = boost::mutex::scoped_lock(cache.cacheMutex_);
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229 #endif
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230
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231 if (cache.content_.Contains(key, item_))
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232 {
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233 cache.content_.MakeMostRecent(key);
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234 }
3563
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235
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236 #if !defined(__EMSCRIPTEN__)
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237 cacheLock_.unlock();
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238
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239 if (item_ == NULL)
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240 {
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241 // This item does not exist in the cache, we can release the
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242 // reader/writer lock
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243 if (unique)
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244 {
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245 writerLock_.unlock();
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246 }
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247 else
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248 {
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249 readerLock_.unlock();
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250 }
3557
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251 }
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252 #endif
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253 }
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254
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255
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256 ICacheable& MemoryObjectCache::Accessor::GetValue() const
3557
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257 {
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258 if (IsValid())
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259 {
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260 return item_->GetValue();
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261 }
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262 else
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263 {
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264 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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265 }
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266 }
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267
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268
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269 const boost::posix_time::ptime& MemoryObjectCache::Accessor::GetTime() const
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270 {
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271 if (IsValid())
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272 {
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273 return item_->GetTime();
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274 }
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275 else
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276 {
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277 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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278 }
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279 }
4d809b2e1141 better cache toolbox: MemoryObjectCache
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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