Mercurial > hg > orthanc
annotate OrthancFramework/Sources/Cache/MemoryStringCache.cpp @ 5420:d37dff2c0028 am-new-cache
Optimized the MemoryStringCache to prevent loading the same file multiple times if multiple users request the same file at the same time
author | Alain Mazy <am@osimis.io> |
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date | Mon, 13 Nov 2023 17:01:59 +0100 |
parents | 0ea402b4d901 |
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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) 2017-2023 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
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7 * |
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8 * This program is free software: you can redistribute it and/or |
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9 * modify it under the terms of the GNU Lesser General Public License |
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10 * as published by the Free Software Foundation, either version 3 of |
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11 * the License, or (at your option) any later version. |
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12 * |
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13 * This program is distributed in the hope that it will be useful, but |
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 * Lesser General Public License for more details. |
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17 * |
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18 * You should have received a copy of the GNU Lesser General Public |
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19 * License along with this program. If not, see |
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20 * <http://www.gnu.org/licenses/>. |
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21 **/ |
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22 |
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23 |
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24 #include "../PrecompiledHeaders.h" |
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25 #include "MemoryStringCache.h" |
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26 |
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27 namespace Orthanc |
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28 { |
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29 class MemoryStringCache::StringValue : public ICacheable |
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30 { |
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31 private: |
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32 std::string content_; |
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33 |
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34 public: |
4199 | 35 explicit StringValue(const std::string& content) : |
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36 content_(content) |
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37 { |
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38 } |
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39 |
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40 explicit StringValue(const char* buffer, size_t size) : |
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41 content_(buffer, size) |
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42 { |
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43 } |
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44 |
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45 const std::string& GetContent() const |
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46 { |
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47 return content_; |
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48 } |
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49 |
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50 virtual size_t GetMemoryUsage() const |
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51 { |
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52 return content_.size(); |
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53 } |
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54 }; |
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55 |
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56 |
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57 MemoryStringCache::Accessor::Accessor(MemoryStringCache& cache) |
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58 : cache_(cache), |
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59 shouldAdd_(false) |
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60 { |
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61 } |
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62 |
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63 |
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64 MemoryStringCache::Accessor::~Accessor() |
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65 { |
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66 // if this accessor was the one in charge of loading and adding the data into the cache |
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67 // and it failed to add, remove the key from the list to make sure others accessor |
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68 // stop waiting for it. |
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69 if (shouldAdd_) |
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70 { |
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71 cache_.RemoveFromItemsBeingLoaded(keyToAdd_); |
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72 } |
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73 } |
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74 |
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75 |
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76 bool MemoryStringCache::Accessor::Fetch(std::string& value, const std::string& key) |
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77 { |
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78 // if multiple accessors are fetching at the same time: |
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79 // the first one will return false and will be in charge of adding to the cache. |
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80 // others will wait. |
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81 // if the first one fails to add, or, if the content was too large to fit in the cache, |
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82 // the next one will be in charge of adding ... |
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83 if (!cache_.Fetch(value, key)) |
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84 { |
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85 shouldAdd_ = true; |
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86 keyToAdd_ = key; |
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87 return false; |
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88 } |
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89 |
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90 shouldAdd_ = false; |
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91 keyToAdd_.clear(); |
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92 |
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93 return true; |
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94 } |
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95 |
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96 |
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97 void MemoryStringCache::Accessor::Add(const std::string& key, const std::string& value) |
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98 { |
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99 cache_.Add(key, value); |
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100 shouldAdd_ = false; |
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101 } |
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102 |
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103 |
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104 void MemoryStringCache::Accessor::Add(const std::string& key, const char* buffer, size_t size) |
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105 { |
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106 cache_.Add(key, buffer, size); |
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107 shouldAdd_ = false; |
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108 } |
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109 |
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110 |
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111 MemoryStringCache::MemoryStringCache() : |
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112 currentSize_(0), |
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113 maxSize_(100 * 1024 * 1024) // 100 MB |
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114 { |
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115 } |
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116 |
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117 |
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118 MemoryStringCache::~MemoryStringCache() |
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119 { |
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120 Recycle(0); |
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121 assert(content_.IsEmpty()); |
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122 } |
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123 |
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124 |
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126 { |
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127 return maxSize_; |
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128 } |
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129 |
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130 |
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131 void MemoryStringCache::SetMaximumSize(size_t size) |
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132 { |
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133 if (size == 0) |
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134 { |
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135 throw OrthancException(ErrorCode_ParameterOutOfRange); |
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136 } |
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137 |
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138 // // Make sure no accessor is currently open (as its data may be |
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139 // // removed if recycling is needed) |
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140 // WriterLock contentLock(contentMutex_); |
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141 |
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142 // Lock the global structure of the cache |
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143 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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144 |
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145 Recycle(size); |
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146 maxSize_ = size; |
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147 } |
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148 |
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149 |
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150 void MemoryStringCache::Add(const std::string& key, |
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151 const std::string& value) |
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152 { |
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153 std::unique_ptr<StringValue> item(new StringValue(value)); |
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154 size_t size = value.size(); |
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155 |
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156 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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157 |
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158 if (size > maxSize_) |
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159 { |
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160 // This object is too large to be stored in the cache, discard it |
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161 } |
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162 else if (content_.Contains(key)) |
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163 { |
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164 // Value already stored, don't overwrite the old value but put it on top of the cache |
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165 content_.MakeMostRecent(key); |
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166 } |
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167 else |
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168 { |
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169 Recycle(maxSize_ - size); // Post-condition: currentSize_ <= maxSize_ - size |
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170 assert(currentSize_ + size <= maxSize_); |
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171 |
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172 content_.Add(key, item.release()); |
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173 currentSize_ += size; |
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174 } |
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175 |
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176 RemoveFromItemsBeingLoadedInternal(key); |
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177 } |
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178 |
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179 |
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180 void MemoryStringCache::Add(const std::string& key, |
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181 const void* buffer, |
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182 size_t size) |
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183 { |
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184 Add(key, std::string(reinterpret_cast<const char*>(buffer), size)); |
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185 } |
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186 |
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187 |
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188 void MemoryStringCache::Invalidate(const std::string &key) |
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189 { |
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190 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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191 |
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192 StringValue* item = NULL; |
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193 if (content_.Contains(key, item)) |
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194 { |
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195 assert(item != NULL); |
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196 const size_t size = item->GetMemoryUsage(); |
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197 delete item; |
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198 |
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199 content_.Invalidate(key); |
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200 |
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201 assert(currentSize_ >= size); |
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202 currentSize_ -= size; |
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203 } |
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204 |
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205 RemoveFromItemsBeingLoadedInternal(key); |
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206 } |
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207 |
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208 |
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209 bool MemoryStringCache::Fetch(std::string& value, |
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210 const std::string& key) |
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211 { |
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212 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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213 |
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214 StringValue* item; |
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215 |
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216 // if another client is currently loading the item, wait for it. |
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217 while (itemsBeingLoaded_.find(key) != itemsBeingLoaded_.end() && !content_.Contains(key, item)) |
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218 { |
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219 cacheCond_.wait(cacheLock); |
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220 } |
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221 |
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222 if (content_.Contains(key, item)) |
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223 { |
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224 value = dynamic_cast<StringValue&>(*item).GetContent(); |
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225 content_.MakeMostRecent(key); |
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226 |
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227 return true; |
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228 } |
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229 else |
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230 { |
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231 // note that this accessor will be in charge of loading and adding. |
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232 itemsBeingLoaded_.insert(key); |
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233 return false; |
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234 } |
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235 } |
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236 |
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237 |
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238 void MemoryStringCache::RemoveFromItemsBeingLoaded(const std::string& key) |
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239 { |
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240 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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241 RemoveFromItemsBeingLoadedInternal(key); |
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242 } |
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243 |
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244 |
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245 void MemoryStringCache::RemoveFromItemsBeingLoadedInternal(const std::string& key) |
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246 { |
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247 // notify all waiting users, some of them potentially waiting for this item |
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248 itemsBeingLoaded_.erase(key); |
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249 cacheCond_.notify_all(); |
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250 } |
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251 |
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252 void MemoryStringCache::Recycle(size_t targetSize) |
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253 { |
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254 // WARNING: "cacheMutex_" must be locked |
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255 while (currentSize_ > targetSize) |
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256 { |
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257 assert(!content_.IsEmpty()); |
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258 |
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259 StringValue* item = NULL; |
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260 content_.RemoveOldest(item); |
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261 |
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262 assert(item != NULL); |
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263 const size_t size = item->GetMemoryUsage(); |
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264 delete item; |
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265 |
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266 assert(currentSize_ >= size); |
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267 currentSize_ -= size; |
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268 } |
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269 |
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270 // Post-condition: "currentSize_ <= targetSize" |
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271 |
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272 } |
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273 } |