Mercurial > hg > orthanc

annotate OrthancFramework/Sources/Cache/MemoryStringCache.cpp @ 5676:b744a2cf408a find-refactoring tip

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shorten ParentRetrieveSpecification/ChildrenRetrieveSpecification as ParentSpecification/ChildrenSpecification
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 06 Jul 2024 15:04:28 +0200
parents f7adfb22e20e
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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Lesser General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Lesser General Public
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20 * License along with this program. If not, see
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21 * <http://www.gnu.org/licenses/>.
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22 **/
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23
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24
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25 #include "../PrecompiledHeaders.h"
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26 #include "MemoryStringCache.h"
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27
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28 namespace Orthanc
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29 {
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30 class MemoryStringCache::StringValue : public ICacheable
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31 {
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32 private:
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33 std::string content_;
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34
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35 public:
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36 explicit StringValue(const std::string& content) :
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37 content_(content)
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38 {
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39 }
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40
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41 explicit StringValue(const char* buffer, size_t size) :
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42 content_(buffer, size)
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43 {
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44 }
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45
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46 const std::string& GetContent() const
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47 {
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48 return content_;
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49 }
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50
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51 virtual size_t GetMemoryUsage() const
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52 {
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53 return content_.size();
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54 }
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55 };
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56
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58 MemoryStringCache::Accessor::Accessor(MemoryStringCache& cache)
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59 : cache_(cache),
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60 shouldAdd_(false)
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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 MemoryStringCache::Accessor::~Accessor()
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66 {
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67 // if this accessor was the one in charge of loading and adding the data into the cache
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68 // and it failed to add, remove the key from the list to make sure others accessor
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69 // stop waiting for it.
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70 if (shouldAdd_)
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71 {
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72 cache_.RemoveFromItemsBeingLoaded(keyToAdd_);
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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 bool MemoryStringCache::Accessor::Fetch(std::string& value, const std::string& key)
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78 {
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79 // if multiple accessors are fetching at the same time:
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80 // the first one will return false and will be in charge of adding to the cache.
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81 // others will wait.
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82 // if the first one fails to add, or, if the content was too large to fit in the cache,
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83 // the next one will be in charge of adding ...
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84 if (!cache_.Fetch(value, key))
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85 {
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86 shouldAdd_ = true;
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87 keyToAdd_ = key;
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88 return false;
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89 }
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90
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91 shouldAdd_ = false;
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92 keyToAdd_.clear();
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93
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94 return true;
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95 }
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96
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97
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98 void MemoryStringCache::Accessor::Add(const std::string& key, const std::string& value)
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99 {
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100 cache_.Add(key, value);
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101 shouldAdd_ = false;
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102 }
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103
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104
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105 void MemoryStringCache::Accessor::Add(const std::string& key, const char* buffer, size_t size)
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106 {
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107 cache_.Add(key, buffer, size);
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108 shouldAdd_ = false;
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109 }
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110
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111
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112 MemoryStringCache::MemoryStringCache() :
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113 currentSize_(0),
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114 maxSize_(100 * 1024 * 1024) // 100 MB
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115 {
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116 }
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117
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118
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119 MemoryStringCache::~MemoryStringCache()
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120 {
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121 Recycle(0);
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122 assert(content_.IsEmpty());
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123 }
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124
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125
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126 size_t MemoryStringCache::GetMaximumSize()
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127 {
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128 return maxSize_;
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129 }
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130
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131
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132 void MemoryStringCache::SetMaximumSize(size_t size)
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133 {
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134 if (size == 0)
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135 {
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136 throw OrthancException(ErrorCode_ParameterOutOfRange);
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137 }
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138
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139 // // Make sure no accessor is currently open (as its data may be
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140 // // removed if recycling is needed)
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141 // WriterLock contentLock(contentMutex_);
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142
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143 // Lock the global structure of the cache
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144 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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145
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146 Recycle(size);
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147 maxSize_ = size;
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148 }
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149
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150
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151 void MemoryStringCache::Add(const std::string& key,
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152 const std::string& value)
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153 {
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154 std::unique_ptr<StringValue> item(new StringValue(value));
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155 size_t size = value.size();
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156
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157 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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158
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159 if (size > maxSize_)
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160 {
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161 // This object is too large to be stored in the cache, discard it
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162 }
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163 else if (content_.Contains(key))
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164 {
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165 // Value already stored, don't overwrite the old value but put it on top of the cache
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166 content_.MakeMostRecent(key);
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167 }
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168 else
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169 {
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170 Recycle(maxSize_ - size); // Post-condition: currentSize_ <= maxSize_ - size
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171 assert(currentSize_ + size <= maxSize_);
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172
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173 content_.Add(key, item.release());
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174 currentSize_ += size;
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175 }
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176
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177 RemoveFromItemsBeingLoadedInternal(key);
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178 }
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179
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180
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181 void MemoryStringCache::Add(const std::string& key,
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182 const void* buffer,
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183 size_t size)
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184 {
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185 Add(key, std::string(reinterpret_cast<const char*>(buffer), size));
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186 }
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187
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188
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189 void MemoryStringCache::Invalidate(const std::string &key)
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190 {
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191 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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192
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193 StringValue* item = NULL;
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194 if (content_.Contains(key, item))
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195 {
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196 assert(item != NULL);
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197 const size_t size = item->GetMemoryUsage();
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198 delete item;
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199
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200 content_.Invalidate(key);
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201
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202 assert(currentSize_ >= size);
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203 currentSize_ -= size;
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204 }
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205
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206 RemoveFromItemsBeingLoadedInternal(key);
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207 }
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208
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209
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210 bool MemoryStringCache::Fetch(std::string& value,
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211 const std::string& key)
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212 {
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213 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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214
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215 StringValue* item;
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216
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217 // if another client is currently loading the item, wait for it.
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218 while (itemsBeingLoaded_.find(key) != itemsBeingLoaded_.end() && !content_.Contains(key, item))
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219 {
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220 cacheCond_.wait(cacheLock);
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221 }
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222
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223 if (content_.Contains(key, item))
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224 {
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225 value = dynamic_cast<StringValue&>(*item).GetContent();
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226 content_.MakeMostRecent(key);
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227
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228 return true;
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229 }
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230 else
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231 {
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232 // note that this accessor will be in charge of loading and adding.
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233 itemsBeingLoaded_.insert(key);
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234 return false;
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235 }
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236 }
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237
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238
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239 void MemoryStringCache::RemoveFromItemsBeingLoaded(const std::string& key)
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240 {
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241 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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242 RemoveFromItemsBeingLoadedInternal(key);
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243 }
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244
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245
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246 void MemoryStringCache::RemoveFromItemsBeingLoadedInternal(const std::string& key)
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247 {
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248 // notify all waiting users, some of them potentially waiting for this item
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249 itemsBeingLoaded_.erase(key);
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250 cacheCond_.notify_all();
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251 }
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252
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253 void MemoryStringCache::Recycle(size_t targetSize)
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254 {
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255 // WARNING: "cacheMutex_" must be locked
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256 while (currentSize_ > targetSize)
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257 {
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258 assert(!content_.IsEmpty());
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259
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260 StringValue* item = NULL;
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261 content_.RemoveOldest(item);
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262
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263 assert(item != NULL);
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264 const size_t size = item->GetMemoryUsage();
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265 delete item;
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266
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267 assert(currentSize_ >= size);
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268 currentSize_ -= size;
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269 }
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270
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271 // Post-condition: "currentSize_ <= targetSize"
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272 }
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273
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274 size_t MemoryStringCache::GetCurrentSize() const
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275 {
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276 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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277
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278 return currentSize_;
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279 }
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280
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281 size_t MemoryStringCache::GetNumberOfItems() const
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282 {
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283 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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284 return content_.GetSize();
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285
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286 }
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287
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288 }