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annotate OrthancFramework/Sources/Cache/MemoryObjectCache.cpp @ 4544:ae63b301d522 Orthanc-1.7.4

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 02 Mar 2021 16:52:26 +0100
parents bf7b9edf6b81
children d9473bd5ed43
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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) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "MemoryObjectCache.h"
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25
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26 #include "../Compatibility.h"
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27
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28 namespace Orthanc
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29 {
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30 class MemoryObjectCache::Item : public boost::noncopyable
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31 {
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32 private:
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33 ICacheable* value_;
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34 boost::posix_time::ptime time_;
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35
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36 public:
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37 explicit Item(ICacheable* value) : // Takes ownership
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38 value_(value),
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39 time_(boost::posix_time::second_clock::local_time())
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40 {
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41 if (value == NULL)
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42 {
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43 throw OrthancException(ErrorCode_NullPointer);
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44 }
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45 }
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46
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47 ~Item()
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48 {
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49 assert(value_ != NULL);
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50 delete value_;
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51 }
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52
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53 ICacheable& GetValue() const
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54 {
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55 assert(value_ != NULL);
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56 return *value_;
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57 }
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58
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59 const boost::posix_time::ptime& GetTime() const
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60 {
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61 return time_;
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62 }
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63 };
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64
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65
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66 void MemoryObjectCache::Recycle(size_t targetSize)
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67 {
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68 // WARNING: "cacheMutex_" must be locked
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69 while (currentSize_ > targetSize)
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70 {
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71 assert(!content_.IsEmpty());
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72
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73 Item* item = NULL;
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74 content_.RemoveOldest(item);
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75
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76 assert(item != NULL);
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77 const size_t size = item->GetValue().GetMemoryUsage();
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78 delete item;
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79
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80 assert(currentSize_ >= size);
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81 currentSize_ -= size;
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82 }
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83
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84 // Post-condition: "currentSize_ <= targetSize"
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85 }
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86
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87
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88 MemoryObjectCache::MemoryObjectCache() :
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89 currentSize_(0),
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90 maxSize_(100 * 1024 * 1024) // 100 MB
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91 {
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92 }
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93
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94
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95 MemoryObjectCache::~MemoryObjectCache()
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96 {
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97 Recycle(0);
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98 assert(content_.IsEmpty());
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99 }
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100
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101
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102 size_t MemoryObjectCache::GetMaximumSize()
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103 {
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104 #if !defined(__EMSCRIPTEN__)
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105 boost::mutex::scoped_lock lock(cacheMutex_);
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106 #endif
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107
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108 return maxSize_;
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109 }
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110
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111
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112 void MemoryObjectCache::SetMaximumSize(size_t size)
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113 {
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114 if (size == 0)
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115 {
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116 throw OrthancException(ErrorCode_ParameterOutOfRange);
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117 }
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118
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119 #if !defined(__EMSCRIPTEN__)
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120 // Make sure no accessor is currently open (as its data may be
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121 // removed if recycling is needed)
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122 WriterLock contentLock(contentMutex_);
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123
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124 // Lock the global structure of the cache
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125 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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126 #endif
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127
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128 Recycle(size);
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129 maxSize_ = size;
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130 }
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131
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132
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133 void MemoryObjectCache::Acquire(const std::string& key,
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134 ICacheable* value)
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135 {
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136 std::unique_ptr<Item> item(new Item(value));
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137
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138 if (value == NULL)
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139 {
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140 throw OrthancException(ErrorCode_NullPointer);
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141 }
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142 else
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143 {
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144 #if !defined(__EMSCRIPTEN__)
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145 // Make sure no accessor is currently open (as its data may be
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146 // removed if recycling is needed)
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147 WriterLock contentLock(contentMutex_);
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148
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149 // Lock the global structure of the cache
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150 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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151 #endif
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152
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153 const size_t size = item->GetValue().GetMemoryUsage();
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154
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155 if (size > maxSize_)
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156 {
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157 // This object is too large to be stored in the cache, discard it
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158 }
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159 else if (content_.Contains(key))
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160 {
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161 // Value already stored, don't overwrite the old value
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162 content_.MakeMostRecent(key);
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163 }
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164 else
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165 {
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166 Recycle(maxSize_ - size); // Post-condition: currentSize_ <= maxSize_ - size
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167 assert(currentSize_ + size <= maxSize_);
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168
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169 content_.Add(key, item.release());
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170 currentSize_ += size;
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171 }
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172 }
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173 }
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174
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175
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176 void MemoryObjectCache::Invalidate(const std::string& key)
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177 {
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178 #if !defined(__EMSCRIPTEN__)
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179 // Make sure no accessor is currently open (as it may correspond
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180 // to the key to remove)
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181 WriterLock contentLock(contentMutex_);
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182
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183 // Lock the global structure of the cache
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184 boost::mutex::scoped_lock cacheLock(cacheMutex_);
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185 #endif
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186
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187 Item* item = NULL;
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188 if (content_.Contains(key, item))
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189 {
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190 assert(item != NULL);
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191 const size_t size = item->GetValue().GetMemoryUsage();
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192 delete item;
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193
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194 content_.Invalidate(key);
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195
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196 assert(currentSize_ >= size);
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197 currentSize_ -= size;
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198 }
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199 }
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200
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201
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202 MemoryObjectCache::Accessor::Accessor(MemoryObjectCache& cache,
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203 const std::string& key,
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204 bool unique) :
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205 item_(NULL)
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206 {
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207 #if !defined(__EMSCRIPTEN__)
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208 if (unique)
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209 {
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210 writerLock_ = WriterLock(cache.contentMutex_);
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211 }
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212 else
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213 {
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214 readerLock_ = ReaderLock(cache.contentMutex_);
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215 }
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216
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217 // Lock the global structure of the cache, must be *after* the
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218 // reader/writer lock
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219 cacheLock_ = boost::mutex::scoped_lock(cache.cacheMutex_);
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220 #endif
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221
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222 if (cache.content_.Contains(key, item_))
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223 {
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224 cache.content_.MakeMostRecent(key);
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225 }
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226
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227 #if !defined(__EMSCRIPTEN__)
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228 cacheLock_.unlock();
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229
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230 if (item_ == NULL)
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231 {
3563
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232 // This item does not exist in the cache, we can release the
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233 // reader/writer lock
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234 if (unique)
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235 {
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236 writerLock_.unlock();
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237 }
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238 else
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239 {
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240 readerLock_.unlock();
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241 }
3557
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242 }
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243 #endif
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244 }
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245
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246
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247 ICacheable& MemoryObjectCache::Accessor::GetValue() const
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248 {
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249 if (IsValid())
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250 {
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251 return item_->GetValue();
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252 }
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253 else
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254 {
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255 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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256 }
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257 }
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258
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259
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260 const boost::posix_time::ptime& MemoryObjectCache::Accessor::GetTime() const
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261 {
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262 if (IsValid())
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263 {
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264 return item_->GetTime();
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265 }
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266 else
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267 {
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268 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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269 }
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270 }
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271 }