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annotate OrthancFramework/Sources/Cache/MemoryObjectCache.cpp @ 5640:f7adfb22e20e

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updated copyright, as Orthanc Team now replaces Osimis
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 30 May 2024 21:19:57 +0200
parents 48b8dae6dc77
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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24
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25 #include "../PrecompiledHeaders.h"
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26 #include "MemoryObjectCache.h"
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27
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28 #include "../Compatibility.h"
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29
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30 namespace Orthanc
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31 {
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32 class MemoryObjectCache::Item : public boost::noncopyable
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33 {
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34 private:
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35 ICacheable* value_;
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36 boost::posix_time::ptime time_;
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37
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38 public:
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39 explicit Item(ICacheable* value) : // Takes ownership
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40 value_(value),
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41 time_(boost::posix_time::second_clock::local_time())
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42 {
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43 if (value == NULL)
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44 {
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45 throw OrthancException(ErrorCode_NullPointer);
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46 }
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47 }
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48
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49 ~Item()
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50 {
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51 assert(value_ != NULL);
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52 delete value_;
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53 }
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54
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55 ICacheable& GetValue() const
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56 {
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57 assert(value_ != NULL);
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58 return *value_;
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59 }
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60
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61 const boost::posix_time::ptime& GetTime() const
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62 {
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63 return time_;
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64 }
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65 };
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66
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67
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68 void MemoryObjectCache::Recycle(size_t targetSize)
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69 {
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70 // WARNING: "cacheMutex_" must be locked
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71 while (currentSize_ > targetSize)
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72 {
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73 assert(!content_.IsEmpty());
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74
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75 Item* item = NULL;
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76 content_.RemoveOldest(item);
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77
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78 assert(item != NULL);
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79 const size_t size = item->GetValue().GetMemoryUsage();
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80 delete item;
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81
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82 assert(currentSize_ >= size);
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83 currentSize_ -= size;
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84 }
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85
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86 // Post-condition: "currentSize_ <= targetSize"
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87 }
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88
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89
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90 MemoryObjectCache::MemoryObjectCache() :
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91 currentSize_(0),
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92 maxSize_(100 * 1024 * 1024) // 100 MB
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93 {
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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 {
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99 Recycle(0);
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100 assert(content_.IsEmpty());
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101 }
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102
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103
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104 size_t MemoryObjectCache::GetNumberOfItems()
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105 {
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106 #if !defined(__EMSCRIPTEN__)
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107 boost::mutex::scoped_lock lock(cacheMutex_);
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108 #endif
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109
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110 return content_.GetSize();
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111 }
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112
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113
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114 size_t MemoryObjectCache::GetCurrentSize()
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115 {
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116 #if !defined(__EMSCRIPTEN__)
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117 boost::mutex::scoped_lock lock(cacheMutex_);
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118 #endif
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119
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120 return currentSize_;
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121 }
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122
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123
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124 size_t MemoryObjectCache::GetMaximumSize()
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125 {
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126 #if !defined(__EMSCRIPTEN__)
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127 boost::mutex::scoped_lock lock(cacheMutex_);
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128 #endif
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129
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130 return maxSize_;
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131 }
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132
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133
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134 void MemoryObjectCache::SetMaximumSize(size_t size)
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135 {
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136 if (size == 0)
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137 {
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138 throw OrthancException(ErrorCode_ParameterOutOfRange);
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139 }
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140
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141 #if !defined(__EMSCRIPTEN__)
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142 // Make sure no accessor is currently open (as its data may be
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143 // removed if recycling is needed)
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144 WriterLock contentLock(contentMutex_);
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145
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146 // Lock the global structure of the cache
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147 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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148 #endif
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149
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150 Recycle(size);
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151 maxSize_ = size;
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152 }
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153
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154
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155 void MemoryObjectCache::Acquire(const std::string& key,
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156 ICacheable* value)
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157 {
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158 std::unique_ptr<Item> item(new Item(value));
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159
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160 if (value == NULL)
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161 {
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162 throw OrthancException(ErrorCode_NullPointer);
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163 }
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164 else
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165 {
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166 #if !defined(__EMSCRIPTEN__)
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167 // Make sure no accessor is currently open (as its data may be
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168 // removed if recycling is needed)
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169 WriterLock contentLock(contentMutex_);
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170
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171 // Lock the global structure of the cache
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172 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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173 #endif
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174
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175 const size_t size = item->GetValue().GetMemoryUsage();
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176
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177 if (size > maxSize_)
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178 {
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179 // This object is too large to be stored in the cache, discard it
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180 }
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181 else if (content_.Contains(key))
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182 {
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183 // Value already stored, don't overwrite the old value
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184 content_.MakeMostRecent(key);
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185 }
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186 else
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187 {
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188 Recycle(maxSize_ - size); // Post-condition: currentSize_ <= maxSize_ - size
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189 assert(currentSize_ + size <= maxSize_);
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190
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191 content_.Add(key, item.release());
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192 currentSize_ += size;
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193 }
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194 }
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195 }
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196
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197
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198 void MemoryObjectCache::Invalidate(const std::string& key)
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199 {
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200 #if !defined(__EMSCRIPTEN__)
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201 // Make sure no accessor is currently open (as it may correspond
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202 // to the key to remove)
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203 WriterLock contentLock(contentMutex_);
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204
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205 // Lock the global structure of the cache
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206 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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207 #endif
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208
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209 Item* item = NULL;
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210 if (content_.Contains(key, item))
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211 {
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212 assert(item != NULL);
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213 const size_t size = item->GetValue().GetMemoryUsage();
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214 delete item;
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215
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216 content_.Invalidate(key);
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217
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218 assert(currentSize_ >= size);
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219 currentSize_ -= size;
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220 }
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221 }
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222
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223
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224 MemoryObjectCache::Accessor::Accessor(MemoryObjectCache& cache,
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225 const std::string& key,
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226 bool unique) :
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227 item_(NULL)
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228 {
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229 #if !defined(__EMSCRIPTEN__)
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230 if (unique)
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231 {
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232 writerLock_ = WriterLock(cache.contentMutex_);
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233 }
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234 else
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235 {
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236 readerLock_ = ReaderLock(cache.contentMutex_);
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237 }
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238
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239 // Lock the global structure of the cache, must be *after* the
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240 // reader/writer lock
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241 cacheLock_ = boost::mutex::scoped_lock(cache.cacheMutex_);
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242 #endif
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243
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244 if (cache.content_.Contains(key, item_))
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245 {
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246 cache.content_.MakeMostRecent(key);
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247 }
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248
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249 #if !defined(__EMSCRIPTEN__)
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250 cacheLock_.unlock();
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251
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252 if (item_ == NULL)
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253 {
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254 // This item does not exist in the cache, we can release the
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255 // reader/writer lock
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256 if (unique)
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257 {
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258 writerLock_.unlock();
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259 }
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260 else
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261 {
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262 readerLock_.unlock();
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263 }
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264 }
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265 #endif
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266 }
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267
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268
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269 ICacheable& MemoryObjectCache::Accessor::GetValue() 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_->GetValue();
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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 }
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280
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281
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282 const boost::posix_time::ptime& MemoryObjectCache::Accessor::GetTime() const
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283 {
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284 if (IsValid())
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285 {
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286 return item_->GetTime();
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287 }
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288 else
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289 {
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290 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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291 }
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292 }
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293 }