Mercurial > hg > orthanc
annotate OrthancFramework/Sources/Cache/MemoryObjectCache.cpp @ 4456:3e4f7b7840f0
new class: ParsedDicomCache()
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 19 Jan 2021 16:11:23 +0100 |
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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) 2017-2021 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 "MemoryObjectCache.h" |
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25 |
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26 #include "../Compatibility.h" |
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27 |
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28 namespace Orthanc |
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29 { |
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30 class MemoryObjectCache::Item : public boost::noncopyable |
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31 { |
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32 private: |
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33 ICacheable* value_; |
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34 boost::posix_time::ptime time_; |
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35 |
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36 public: |
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37 explicit Item(ICacheable* value) : // Takes ownership |
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38 value_(value), |
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39 time_(boost::posix_time::second_clock::local_time()) |
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40 { |
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41 if (value == NULL) |
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42 { |
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43 throw OrthancException(ErrorCode_NullPointer); |
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44 } |
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45 } |
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46 |
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47 ~Item() |
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48 { |
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49 assert(value_ != NULL); |
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50 delete value_; |
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51 } |
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52 |
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53 ICacheable& GetValue() const |
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54 { |
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55 assert(value_ != NULL); |
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56 return *value_; |
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57 } |
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58 |
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59 const boost::posix_time::ptime& GetTime() const |
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60 { |
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61 return time_; |
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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 void MemoryObjectCache::Recycle(size_t targetSize) |
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67 { |
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68 // WARNING: "cacheMutex_" must be locked |
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69 while (currentSize_ > targetSize) |
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70 { |
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71 assert(!content_.IsEmpty()); |
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72 |
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73 Item* item = NULL; |
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74 content_.RemoveOldest(item); |
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75 |
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76 assert(item != NULL); |
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77 const size_t size = item->GetValue().GetMemoryUsage(); |
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78 delete item; |
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79 |
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80 assert(currentSize_ >= size); |
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81 currentSize_ -= size; |
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82 } |
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83 |
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84 // Post-condition: "currentSize_ <= targetSize" |
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85 } |
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86 |
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87 |
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88 MemoryObjectCache::MemoryObjectCache() : |
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89 currentSize_(0), |
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90 maxSize_(100 * 1024 * 1024) // 100 MB |
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91 { |
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92 } |
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93 |
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94 |
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95 MemoryObjectCache::~MemoryObjectCache() |
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96 { |
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97 Recycle(0); |
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98 assert(content_.IsEmpty()); |
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99 } |
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100 |
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101 |
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102 size_t MemoryObjectCache::GetCurrentSize() |
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103 { |
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104 #if !defined(__EMSCRIPTEN__) |
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105 boost::mutex::scoped_lock lock(cacheMutex_); |
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106 #endif |
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107 |
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108 return currentSize_; |
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109 } |
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110 |
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111 |
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112 size_t MemoryObjectCache::GetMaximumSize() |
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113 { |
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114 #if !defined(__EMSCRIPTEN__) |
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115 boost::mutex::scoped_lock lock(cacheMutex_); |
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116 #endif |
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117 |
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118 return maxSize_; |
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119 } |
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120 |
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121 |
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122 void MemoryObjectCache::SetMaximumSize(size_t size) |
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123 { |
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124 if (size == 0) |
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125 { |
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126 throw OrthancException(ErrorCode_ParameterOutOfRange); |
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127 } |
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128 |
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129 #if !defined(__EMSCRIPTEN__) |
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130 // Make sure no accessor is currently open (as its data may be |
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131 // removed if recycling is needed) |
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132 WriterLock contentLock(contentMutex_); |
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133 |
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134 // Lock the global structure of the cache |
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135 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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136 #endif |
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137 |
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138 Recycle(size); |
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139 maxSize_ = size; |
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140 } |
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141 |
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142 |
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143 void MemoryObjectCache::Acquire(const std::string& key, |
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144 ICacheable* value) |
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145 { |
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146 std::unique_ptr<Item> item(new Item(value)); |
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147 |
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148 if (value == NULL) |
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149 { |
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150 throw OrthancException(ErrorCode_NullPointer); |
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151 } |
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152 else |
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153 { |
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154 #if !defined(__EMSCRIPTEN__) |
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155 // Make sure no accessor is currently open (as its data may be |
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156 // removed if recycling is needed) |
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157 WriterLock contentLock(contentMutex_); |
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158 |
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159 // Lock the global structure of the cache |
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160 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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161 #endif |
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162 |
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163 const size_t size = item->GetValue().GetMemoryUsage(); |
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164 |
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165 if (size > maxSize_) |
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166 { |
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167 // This object is too large to be stored in the cache, discard it |
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168 } |
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169 else if (content_.Contains(key)) |
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170 { |
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171 // Value already stored, don't overwrite the old value |
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172 content_.MakeMostRecent(key); |
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173 } |
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174 else |
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175 { |
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176 Recycle(maxSize_ - size); // Post-condition: currentSize_ <= maxSize_ - size |
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177 assert(currentSize_ + size <= maxSize_); |
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178 |
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179 content_.Add(key, item.release()); |
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180 currentSize_ += size; |
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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 |
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186 void MemoryObjectCache::Invalidate(const std::string& key) |
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187 { |
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188 #if !defined(__EMSCRIPTEN__) |
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189 // Make sure no accessor is currently open (as it may correspond |
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190 // to the key to remove) |
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191 WriterLock contentLock(contentMutex_); |
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192 |
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193 // Lock the global structure of the cache |
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194 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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195 #endif |
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196 |
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197 Item* item = NULL; |
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198 if (content_.Contains(key, item)) |
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199 { |
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200 assert(item != NULL); |
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201 const size_t size = item->GetValue().GetMemoryUsage(); |
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202 delete item; |
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203 |
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204 content_.Invalidate(key); |
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205 |
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206 assert(currentSize_ >= size); |
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207 currentSize_ -= size; |
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208 } |
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209 } |
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210 |
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211 |
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212 MemoryObjectCache::Accessor::Accessor(MemoryObjectCache& cache, |
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213 const std::string& key, |
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214 bool unique) : |
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215 item_(NULL) |
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216 { |
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217 #if !defined(__EMSCRIPTEN__) |
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218 if (unique) |
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219 { |
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220 writerLock_ = WriterLock(cache.contentMutex_); |
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221 } |
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222 else |
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223 { |
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224 readerLock_ = ReaderLock(cache.contentMutex_); |
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225 } |
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226 |
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227 // Lock the global structure of the cache, must be *after* the |
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228 // reader/writer lock |
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229 cacheLock_ = boost::mutex::scoped_lock(cache.cacheMutex_); |
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230 #endif |
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231 |
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232 if (cache.content_.Contains(key, item_)) |
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233 { |
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234 cache.content_.MakeMostRecent(key); |
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235 } |
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236 |
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237 #if !defined(__EMSCRIPTEN__) |
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238 cacheLock_.unlock(); |
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239 |
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240 if (item_ == NULL) |
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241 { |
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242 // This item does not exist in the cache, we can release the |
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243 // reader/writer lock |
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244 if (unique) |
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245 { |
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246 writerLock_.unlock(); |
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247 } |
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248 else |
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249 { |
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250 readerLock_.unlock(); |
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251 } |
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252 } |
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253 #endif |
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254 } |
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255 |
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256 |
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257 ICacheable& MemoryObjectCache::Accessor::GetValue() const |
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258 { |
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259 if (IsValid()) |
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260 { |
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261 return item_->GetValue(); |
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262 } |
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263 else |
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264 { |
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265 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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266 } |
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267 } |
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268 |
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269 |
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270 const boost::posix_time::ptime& MemoryObjectCache::Accessor::GetTime() const |
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271 { |
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272 if (IsValid()) |
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273 { |
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274 return item_->GetTime(); |
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275 } |
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276 else |
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277 { |
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278 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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279 } |
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280 } |
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281 } |