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annotate OrthancFramework/Sources/Cache/MemoryObjectCache.cpp @ 5180:d2626a062809

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fix DicomMap::SetupFindXXXTemplate() methods
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 25 Mar 2023 11:21:09 +0100
parents 43e613a7756b
children 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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 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 "MemoryObjectCache.h"
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26
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27 #include "../Compatibility.h"
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28
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29 namespace Orthanc
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30 {
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31 class MemoryObjectCache::Item : public boost::noncopyable
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32 {
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33 private:
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34 ICacheable* value_;
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35 boost::posix_time::ptime time_;
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36
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37 public:
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38 explicit Item(ICacheable* value) : // Takes ownership
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39 value_(value),
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40 time_(boost::posix_time::second_clock::local_time())
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41 {
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42 if (value == NULL)
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43 {
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44 throw OrthancException(ErrorCode_NullPointer);
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45 }
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46 }
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47
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48 ~Item()
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49 {
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50 assert(value_ != NULL);
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51 delete value_;
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52 }
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53
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54 ICacheable& GetValue() const
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55 {
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56 assert(value_ != NULL);
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57 return *value_;
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58 }
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59
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60 const boost::posix_time::ptime& GetTime() const
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61 {
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62 return time_;
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63 }
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64 };
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65
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66
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67 void MemoryObjectCache::Recycle(size_t targetSize)
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68 {
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69 // WARNING: "cacheMutex_" must be locked
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70 while (currentSize_ > targetSize)
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71 {
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72 assert(!content_.IsEmpty());
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73
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74 Item* item = NULL;
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75 content_.RemoveOldest(item);
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76
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77 assert(item != NULL);
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78 const size_t size = item->GetValue().GetMemoryUsage();
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79 delete item;
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80
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81 assert(currentSize_ >= size);
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82 currentSize_ -= size;
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83 }
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84
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85 // Post-condition: "currentSize_ <= targetSize"
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86 }
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87
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88
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89 MemoryObjectCache::MemoryObjectCache() :
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90 currentSize_(0),
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91 maxSize_(100 * 1024 * 1024) // 100 MB
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92 {
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93 }
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94
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95
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96 MemoryObjectCache::~MemoryObjectCache()
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97 {
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98 Recycle(0);
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99 assert(content_.IsEmpty());
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100 }
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101
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102
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103 size_t MemoryObjectCache::GetNumberOfItems()
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104 {
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105 #if !defined(__EMSCRIPTEN__)
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106 boost::mutex::scoped_lock lock(cacheMutex_);
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107 #endif
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108
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109 return content_.GetSize();
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110 }
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111
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112
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113 size_t MemoryObjectCache::GetCurrentSize()
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114 {
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115 #if !defined(__EMSCRIPTEN__)
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116 boost::mutex::scoped_lock lock(cacheMutex_);
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117 #endif
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118
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119 return currentSize_;
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120 }
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121
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122
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123 size_t MemoryObjectCache::GetMaximumSize()
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124 {
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125 #if !defined(__EMSCRIPTEN__)
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126 boost::mutex::scoped_lock lock(cacheMutex_);
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127 #endif
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128
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129 return maxSize_;
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130 }
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131
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132
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133 void MemoryObjectCache::SetMaximumSize(size_t size)
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134 {
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135 if (size == 0)
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136 {
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137 throw OrthancException(ErrorCode_ParameterOutOfRange);
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138 }
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139
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140 #if !defined(__EMSCRIPTEN__)
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141 // Make sure no accessor is currently open (as its data may be
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142 // removed if recycling is needed)
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143 WriterLock contentLock(contentMutex_);
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144
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145 // Lock the global structure of the cache
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146 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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147 #endif
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148
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149 Recycle(size);
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150 maxSize_ = size;
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151 }
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152
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153
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154 void MemoryObjectCache::Acquire(const std::string& key,
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155 ICacheable* value)
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156 {
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157 std::unique_ptr<Item> item(new Item(value));
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158
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159 if (value == NULL)
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160 {
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161 throw OrthancException(ErrorCode_NullPointer);
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162 }
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163 else
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164 {
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165 #if !defined(__EMSCRIPTEN__)
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166 // Make sure no accessor is currently open (as its data may be
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167 // removed if recycling is needed)
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168 WriterLock contentLock(contentMutex_);
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169
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170 // Lock the global structure of the cache
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171 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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172 #endif
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173
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174 const size_t size = item->GetValue().GetMemoryUsage();
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175
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176 if (size > maxSize_)
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177 {
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178 // This object is too large to be stored in the cache, discard it
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179 }
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180 else if (content_.Contains(key))
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181 {
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182 // Value already stored, don't overwrite the old value
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183 content_.MakeMostRecent(key);
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184 }
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185 else
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186 {
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187 Recycle(maxSize_ - size); // Post-condition: currentSize_ <= maxSize_ - size
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188 assert(currentSize_ + size <= maxSize_);
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189
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190 content_.Add(key, item.release());
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191 currentSize_ += size;
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192 }
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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 void MemoryObjectCache::Invalidate(const std::string& key)
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198 {
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199 #if !defined(__EMSCRIPTEN__)
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200 // Make sure no accessor is currently open (as it may correspond
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201 // to the key to remove)
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202 WriterLock contentLock(contentMutex_);
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203
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204 // Lock the global structure of the cache
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205 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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206 #endif
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207
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208 Item* item = NULL;
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209 if (content_.Contains(key, item))
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210 {
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211 assert(item != NULL);
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212 const size_t size = item->GetValue().GetMemoryUsage();
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213 delete item;
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214
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215 content_.Invalidate(key);
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216
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217 assert(currentSize_ >= size);
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218 currentSize_ -= size;
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219 }
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220 }
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221
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222
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223 MemoryObjectCache::Accessor::Accessor(MemoryObjectCache& cache,
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224 const std::string& key,
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225 bool unique) :
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226 item_(NULL)
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227 {
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228 #if !defined(__EMSCRIPTEN__)
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229 if (unique)
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230 {
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231 writerLock_ = WriterLock(cache.contentMutex_);
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232 }
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233 else
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234 {
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235 readerLock_ = ReaderLock(cache.contentMutex_);
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236 }
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237
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238 // Lock the global structure of the cache, must be *after* the
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239 // reader/writer lock
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240 cacheLock_ = boost::mutex::scoped_lock(cache.cacheMutex_);
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241 #endif
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242
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243 if (cache.content_.Contains(key, item_))
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244 {
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245 cache.content_.MakeMostRecent(key);
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246 }
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247
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248 #if !defined(__EMSCRIPTEN__)
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249 cacheLock_.unlock();
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250
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251 if (item_ == NULL)
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252 {
3563
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253 // This item does not exist in the cache, we can release the
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254 // reader/writer lock
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255 if (unique)
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256 {
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257 writerLock_.unlock();
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258 }
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259 else
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260 {
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261 readerLock_.unlock();
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262 }
3557
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263 }
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diff changeset
264 #endif
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265 }
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266
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267
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268 ICacheable& MemoryObjectCache::Accessor::GetValue() const
3557
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269 {
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270 if (IsValid())
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271 {
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272 return item_->GetValue();
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273 }
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274 else
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275 {
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276 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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277 }
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278 }
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279
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280
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281 const boost::posix_time::ptime& MemoryObjectCache::Accessor::GetTime() const
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282 {
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283 if (IsValid())
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284 {
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285 return item_->GetTime();
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286 }
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287 else
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288 {
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289 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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290 }
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291 }
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292 }