Mercurial > hg > orthanc
annotate OrthancFramework/Sources/Cache/MemoryStringCache.cpp @ 5853:4d932683049d get-scu tip
very first implementation of C-Get SCU
author | Alain Mazy <am@orthanc.team> |
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date | Tue, 29 Oct 2024 17:25:49 +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) 2017-2023 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: |
4199 | 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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57 |
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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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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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273 | |
274 size_t MemoryStringCache::GetCurrentSize() const | |
275 { | |
276 boost::mutex::scoped_lock cacheLock(cacheMutex_); | |
277 | |
278 return currentSize_; | |
279 } | |
280 | |
281 size_t MemoryStringCache::GetNumberOfItems() const | |
282 { | |
283 boost::mutex::scoped_lock cacheLock(cacheMutex_); | |
284 return content_.GetSize(); | |
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285 |
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286 } |
5431 | 287 |
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288 } |