Mercurial > hg > orthanc
annotate Core/Cache/MemoryObjectCache.cpp @ 3664:85acfcc15829 storage-commitment
sample storage commitment plugin, C++ wrapper
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 12 Feb 2020 16:06:58 +0100 |
parents | 94f4a18a79cc |
children | 2a170a8f1faf |
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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 General Public License as |
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9 * published by the Free Software Foundation, either version 3 of the |
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10 * License, or (at your option) any later version. |
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11 * |
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12 * In addition, as a special exception, the copyright holders of this |
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13 * program give permission to link the code of its release with the |
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it |
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15 * that use the same license as the "OpenSSL" library), and distribute |
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16 * the linked executables. You must obey the GNU General Public License |
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17 * in all respects for all of the code used other than "OpenSSL". If you |
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18 * modify file(s) with this exception, you may extend this exception to |
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19 * your version of the file(s), but you are not obligated to do so. If |
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20 * you do not wish to do so, delete this exception statement from your |
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21 * version. If you delete this exception statement from all source files |
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22 * in the program, then also delete it here. |
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23 * |
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24 * This program is distributed in the hope that it will be useful, but |
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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27 * General Public License for more details. |
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28 * |
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29 * You should have received a copy of the GNU General Public License |
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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31 **/ |
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32 |
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33 |
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34 #include "../PrecompiledHeaders.h" |
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35 #include "MemoryObjectCache.h" |
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36 |
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37 namespace Orthanc |
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38 { |
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39 class MemoryObjectCache::Item : public boost::noncopyable |
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40 { |
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41 private: |
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42 ICacheable* value_; |
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43 boost::posix_time::ptime time_; |
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44 |
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45 public: |
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46 explicit Item(ICacheable* value) : // Takes ownership |
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47 value_(value), |
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48 time_(boost::posix_time::second_clock::local_time()) |
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49 { |
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50 if (value == NULL) |
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51 { |
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52 throw OrthancException(ErrorCode_NullPointer); |
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53 } |
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54 } |
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55 |
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56 ~Item() |
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57 { |
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58 assert(value_ != NULL); |
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59 delete value_; |
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60 } |
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61 |
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62 ICacheable& GetValue() const |
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63 { |
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64 assert(value_ != NULL); |
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65 return *value_; |
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66 } |
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67 |
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68 const boost::posix_time::ptime& GetTime() const |
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69 { |
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70 return time_; |
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71 } |
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72 }; |
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73 |
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74 |
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75 void MemoryObjectCache::Recycle(size_t targetSize) |
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76 { |
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77 // WARNING: "cacheMutex_" must be locked |
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78 while (currentSize_ > targetSize) |
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79 { |
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80 assert(!content_.IsEmpty()); |
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81 |
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82 Item* item = NULL; |
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83 content_.RemoveOldest(item); |
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84 |
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85 assert(item != NULL); |
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86 const size_t size = item->GetValue().GetMemoryUsage(); |
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87 delete item; |
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88 |
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89 assert(currentSize_ >= size); |
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90 currentSize_ -= size; |
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91 } |
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92 |
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93 // Post-condition: "currentSize_ <= targetSize" |
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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 currentSize_(0), |
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99 maxSize_(100 * 1024 * 1024) // 100 MB |
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100 { |
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101 } |
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102 |
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103 |
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104 MemoryObjectCache::~MemoryObjectCache() |
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105 { |
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106 Recycle(0); |
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107 assert(content_.IsEmpty()); |
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108 } |
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109 |
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110 |
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111 size_t MemoryObjectCache::GetMaximumSize() |
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112 { |
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113 #if !defined(__EMSCRIPTEN__) |
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114 boost::mutex::scoped_lock lock(cacheMutex_); |
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115 #endif |
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116 |
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117 return maxSize_; |
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118 } |
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119 |
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120 |
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121 void MemoryObjectCache::SetMaximumSize(size_t size) |
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122 { |
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123 if (size == 0) |
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124 { |
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125 throw OrthancException(ErrorCode_ParameterOutOfRange); |
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126 } |
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127 |
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128 #if !defined(__EMSCRIPTEN__) |
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129 // Make sure no accessor is currently open (as its data may be |
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130 // removed if recycling is needed) |
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131 WriterLock contentLock(contentMutex_); |
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132 |
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133 // Lock the global structure of the cache |
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134 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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135 #endif |
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136 |
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137 Recycle(size); |
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138 maxSize_ = size; |
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139 } |
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140 |
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141 |
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142 void MemoryObjectCache::Acquire(const std::string& key, |
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143 ICacheable* value) |
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144 { |
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145 std::auto_ptr<Item> item(new Item(value)); |
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146 |
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147 if (value == NULL) |
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148 { |
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149 throw OrthancException(ErrorCode_NullPointer); |
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150 } |
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151 else |
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152 { |
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153 #if !defined(__EMSCRIPTEN__) |
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154 // Make sure no accessor is currently open (as its data may be |
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155 // removed if recycling is needed) |
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156 WriterLock contentLock(contentMutex_); |
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157 |
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158 // Lock the global structure of the cache |
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159 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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160 #endif |
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161 |
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162 const size_t size = item->GetValue().GetMemoryUsage(); |
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163 |
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164 if (size > maxSize_) |
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165 { |
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166 // This object is too large to be stored in the cache, discard it |
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167 } |
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168 else if (content_.Contains(key)) |
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169 { |
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170 // Value already stored, don't overwrite the old value |
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171 content_.MakeMostRecent(key); |
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172 } |
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173 else |
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174 { |
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175 Recycle(maxSize_ - size); // Post-condition: currentSize_ <= maxSize_ - size |
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176 assert(currentSize_ + size <= maxSize_); |
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177 |
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178 content_.Add(key, item.release()); |
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179 currentSize_ += size; |
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180 } |
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181 } |
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182 } |
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183 |
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184 |
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185 void MemoryObjectCache::Invalidate(const std::string& key) |
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186 { |
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187 #if !defined(__EMSCRIPTEN__) |
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188 // Make sure no accessor is currently open (as it may correspond |
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189 // to the key to remove) |
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190 WriterLock contentLock(contentMutex_); |
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191 |
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192 // Lock the global structure of the cache |
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193 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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194 #endif |
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195 |
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196 Item* item = NULL; |
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197 if (content_.Contains(key, item)) |
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198 { |
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199 assert(item != NULL); |
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200 const size_t size = item->GetValue().GetMemoryUsage(); |
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201 delete item; |
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202 |
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203 content_.Invalidate(key); |
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204 |
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205 assert(currentSize_ >= size); |
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206 currentSize_ -= size; |
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207 } |
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208 } |
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209 |
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210 |
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211 MemoryObjectCache::Accessor::Accessor(MemoryObjectCache& cache, |
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212 const std::string& key, |
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213 bool unique) : |
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214 item_(NULL) |
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215 { |
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216 #if !defined(__EMSCRIPTEN__) |
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217 if (unique) |
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218 { |
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219 writerLock_ = WriterLock(cache.contentMutex_); |
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220 } |
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221 else |
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222 { |
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223 readerLock_ = ReaderLock(cache.contentMutex_); |
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224 } |
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225 |
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226 // Lock the global structure of the cache, must be *after* the |
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227 // reader/writer lock |
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228 cacheLock_ = boost::mutex::scoped_lock(cache.cacheMutex_); |
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229 #endif |
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230 |
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231 if (cache.content_.Contains(key, item_)) |
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232 { |
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233 cache.content_.MakeMostRecent(key); |
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234 } |
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235 |
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236 #if !defined(__EMSCRIPTEN__) |
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237 cacheLock_.unlock(); |
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238 |
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239 if (item_ == NULL) |
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240 { |
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241 // This item does not exist in the cache, we can release the |
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242 // reader/writer lock |
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243 if (unique) |
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244 { |
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245 writerLock_.unlock(); |
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246 } |
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247 else |
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248 { |
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249 readerLock_.unlock(); |
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250 } |
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251 } |
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252 #endif |
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253 } |
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254 |
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255 |
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256 ICacheable& MemoryObjectCache::Accessor::GetValue() const |
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257 { |
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258 if (IsValid()) |
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259 { |
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260 return item_->GetValue(); |
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261 } |
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262 else |
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263 { |
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264 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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265 } |
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266 } |
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267 |
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268 |
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269 const boost::posix_time::ptime& MemoryObjectCache::Accessor::GetTime() 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_->GetTime(); |
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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 } |