Mercurial > hg > orthanc
annotate Core/Cache/MemoryObjectCache.cpp @ 3944:aae045f802f4 transcoding
preparing simplified interface for IDicomTranscoder
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 19 May 2020 10:17:06 +0200 |
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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 #include "../Compatibility.h" |
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38 |
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39 namespace Orthanc |
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40 { |
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41 class MemoryObjectCache::Item : public boost::noncopyable |
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42 { |
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43 private: |
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44 ICacheable* value_; |
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45 boost::posix_time::ptime time_; |
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46 |
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47 public: |
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48 explicit Item(ICacheable* value) : // Takes ownership |
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49 value_(value), |
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50 time_(boost::posix_time::second_clock::local_time()) |
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51 { |
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52 if (value == NULL) |
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53 { |
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54 throw OrthancException(ErrorCode_NullPointer); |
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55 } |
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56 } |
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57 |
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58 ~Item() |
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59 { |
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60 assert(value_ != NULL); |
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61 delete value_; |
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62 } |
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63 |
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64 ICacheable& GetValue() const |
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65 { |
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66 assert(value_ != NULL); |
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67 return *value_; |
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68 } |
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69 |
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70 const boost::posix_time::ptime& GetTime() const |
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71 { |
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72 return time_; |
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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 void MemoryObjectCache::Recycle(size_t targetSize) |
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78 { |
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79 // WARNING: "cacheMutex_" must be locked |
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80 while (currentSize_ > targetSize) |
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81 { |
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82 assert(!content_.IsEmpty()); |
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83 |
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84 Item* item = NULL; |
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85 content_.RemoveOldest(item); |
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86 |
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87 assert(item != NULL); |
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88 const size_t size = item->GetValue().GetMemoryUsage(); |
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89 delete item; |
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90 |
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91 assert(currentSize_ >= size); |
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92 currentSize_ -= size; |
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93 } |
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94 |
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95 // Post-condition: "currentSize_ <= targetSize" |
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96 } |
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97 |
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98 |
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99 MemoryObjectCache::MemoryObjectCache() : |
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100 currentSize_(0), |
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101 maxSize_(100 * 1024 * 1024) // 100 MB |
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102 { |
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103 } |
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104 |
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105 |
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106 MemoryObjectCache::~MemoryObjectCache() |
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107 { |
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108 Recycle(0); |
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109 assert(content_.IsEmpty()); |
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110 } |
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111 |
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112 |
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113 size_t MemoryObjectCache::GetMaximumSize() |
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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 maxSize_; |
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120 } |
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121 |
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122 |
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123 void MemoryObjectCache::SetMaximumSize(size_t size) |
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124 { |
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125 if (size == 0) |
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126 { |
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127 throw OrthancException(ErrorCode_ParameterOutOfRange); |
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128 } |
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129 |
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130 #if !defined(__EMSCRIPTEN__) |
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131 // Make sure no accessor is currently open (as its data may be |
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132 // removed if recycling is needed) |
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133 WriterLock contentLock(contentMutex_); |
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134 |
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135 // Lock the global structure of the cache |
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136 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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137 #endif |
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138 |
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139 Recycle(size); |
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140 maxSize_ = size; |
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141 } |
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142 |
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143 |
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144 void MemoryObjectCache::Acquire(const std::string& key, |
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145 ICacheable* value) |
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146 { |
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147 std::unique_ptr<Item> item(new Item(value)); |
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148 |
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149 if (value == NULL) |
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150 { |
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151 throw OrthancException(ErrorCode_NullPointer); |
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152 } |
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153 else |
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154 { |
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155 #if !defined(__EMSCRIPTEN__) |
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156 // Make sure no accessor is currently open (as its data may be |
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157 // removed if recycling is needed) |
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158 WriterLock contentLock(contentMutex_); |
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159 |
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160 // Lock the global structure of the cache |
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161 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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162 #endif |
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163 |
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164 const size_t size = item->GetValue().GetMemoryUsage(); |
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165 |
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166 if (size > maxSize_) |
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167 { |
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168 // This object is too large to be stored in the cache, discard it |
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169 } |
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170 else if (content_.Contains(key)) |
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171 { |
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172 // Value already stored, don't overwrite the old value |
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173 content_.MakeMostRecent(key); |
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174 } |
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175 else |
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176 { |
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177 Recycle(maxSize_ - size); // Post-condition: currentSize_ <= maxSize_ - size |
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178 assert(currentSize_ + size <= maxSize_); |
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179 |
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180 content_.Add(key, item.release()); |
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181 currentSize_ += size; |
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182 } |
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183 } |
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184 } |
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185 |
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186 |
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187 void MemoryObjectCache::Invalidate(const std::string& key) |
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188 { |
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189 #if !defined(__EMSCRIPTEN__) |
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190 // Make sure no accessor is currently open (as it may correspond |
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191 // to the key to remove) |
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192 WriterLock contentLock(contentMutex_); |
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193 |
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194 // Lock the global structure of the cache |
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195 boost::mutex::scoped_lock cacheLock(cacheMutex_); |
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196 #endif |
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197 |
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198 Item* item = NULL; |
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199 if (content_.Contains(key, item)) |
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200 { |
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201 assert(item != NULL); |
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202 const size_t size = item->GetValue().GetMemoryUsage(); |
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203 delete item; |
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204 |
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205 content_.Invalidate(key); |
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206 |
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207 assert(currentSize_ >= size); |
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208 currentSize_ -= size; |
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209 } |
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210 } |
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211 |
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212 |
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213 MemoryObjectCache::Accessor::Accessor(MemoryObjectCache& cache, |
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214 const std::string& key, |
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215 bool unique) : |
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216 item_(NULL) |
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217 { |
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218 #if !defined(__EMSCRIPTEN__) |
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219 if (unique) |
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220 { |
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221 writerLock_ = WriterLock(cache.contentMutex_); |
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222 } |
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223 else |
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224 { |
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225 readerLock_ = ReaderLock(cache.contentMutex_); |
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226 } |
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227 |
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228 // Lock the global structure of the cache, must be *after* the |
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229 // reader/writer lock |
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230 cacheLock_ = boost::mutex::scoped_lock(cache.cacheMutex_); |
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231 #endif |
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232 |
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233 if (cache.content_.Contains(key, item_)) |
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234 { |
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235 cache.content_.MakeMostRecent(key); |
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236 } |
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237 |
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238 #if !defined(__EMSCRIPTEN__) |
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239 cacheLock_.unlock(); |
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240 |
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241 if (item_ == NULL) |
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242 { |
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243 // This item does not exist in the cache, we can release the |
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244 // reader/writer lock |
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245 if (unique) |
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246 { |
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247 writerLock_.unlock(); |
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248 } |
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249 else |
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250 { |
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251 readerLock_.unlock(); |
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252 } |
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253 } |
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254 #endif |
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255 } |
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256 |
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257 |
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258 ICacheable& MemoryObjectCache::Accessor::GetValue() const |
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259 { |
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260 if (IsValid()) |
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261 { |
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262 return item_->GetValue(); |
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263 } |
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264 else |
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265 { |
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266 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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267 } |
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268 } |
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269 |
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270 |
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271 const boost::posix_time::ptime& MemoryObjectCache::Accessor::GetTime() const |
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272 { |
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273 if (IsValid()) |
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274 { |
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275 return item_->GetTime(); |
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276 } |
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277 else |
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278 { |
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279 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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280 } |
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281 } |
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282 } |