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annotate OrthancFramework/Sources/DicomParsing/ParsedDicomCache.cpp @ 4456:3e4f7b7840f0

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new class: ParsedDicomCache()
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 19 Jan 2021 16:11:23 +0100
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children 789676a8c96a
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4456
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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) 2017-2021 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 "ParsedDicomCache.h"
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25
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26 #include "../OrthancException.h"
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27
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28 namespace Orthanc
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29 {
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30 class ParsedDicomCache::Item : public ICacheable
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31 {
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32 private:
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33 std::unique_ptr<ParsedDicomFile> dicom_;
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34 size_t fileSize_;
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35
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36 public:
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37 Item(ParsedDicomFile* dicom,
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38 size_t fileSize) :
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39 dicom_(dicom),
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40 fileSize_(fileSize)
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41 {
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42 if (dicom == 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 virtual size_t GetMemoryUsage() const ORTHANC_OVERRIDE
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49 {
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50 return fileSize_;
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51 }
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52
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53 ParsedDicomFile& GetDicom() const
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54 {
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55 assert(dicom_.get() != NULL);
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56 return *dicom_;
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57 }
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58 };
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59
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60
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61 ParsedDicomCache::ParsedDicomCache(size_t size) :
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62 cacheSize_(size),
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63 largeSize_(0)
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64 {
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65 if (size == 0)
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66 {
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67 throw OrthancException(ErrorCode_ParameterOutOfRange);
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68 }
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69 }
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70
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71
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72 size_t ParsedDicomCache::GetCurrentSize() // For unit tests only
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73 {
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74 boost::mutex::scoped_lock lock(mutex_);
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75
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76 if (cache_.get() == NULL)
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77 {
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78 return largeSize_;
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79 }
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80 else
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81 {
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82 assert(largeSize_ == 0);
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83 return cache_->GetCurrentSize();
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84 }
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85 }
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86
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87
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88 void ParsedDicomCache::Invalidate(const std::string& id)
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89 {
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90 boost::mutex::scoped_lock lock(mutex_);
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91
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92 if (cache_.get() != NULL)
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93 {
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94 cache_->Invalidate(id);
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95 }
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96
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97 if (largeId_ == id)
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98 {
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99 largeDicom_.reset(NULL);
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100 largeSize_ = 0;
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101 }
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102 }
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103
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104
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105 void ParsedDicomCache::Acquire(const std::string& id,
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106 ParsedDicomFile* dicom, // Takes ownership
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107 size_t fileSize)
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108 {
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109 boost::mutex::scoped_lock lock(mutex_);
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110
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111 if (fileSize >= cacheSize_)
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112 {
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113 cache_.reset(NULL);
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114 largeDicom_.reset(dicom);
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115 largeId_ = id;
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116 largeSize_ = fileSize;
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117 }
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118 else
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119 {
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120 largeDicom_.reset(NULL);
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121 largeSize_ = 0;
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122
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123 if (cache_.get() == NULL)
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124 {
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125 cache_.reset(new MemoryObjectCache);
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126 cache_->SetMaximumSize(cacheSize_);
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127 }
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128
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129 cache_->Acquire(id, new Item(dicom, fileSize));
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130 }
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131 }
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132
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133
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134 ParsedDicomCache::Accessor::Accessor(ParsedDicomCache& that,
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135 const std::string& id) :
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136 lock_(that.mutex_),
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137 id_(id),
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138 file_(NULL),
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139 fileSize_(0)
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140 {
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141 if (that.largeDicom_.get() != NULL &&
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142 that.largeId_ == id)
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143 {
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144 file_ = that.largeDicom_.get();
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145 fileSize_ = that.largeSize_;
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146 }
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147 else if (that.cache_.get() != NULL)
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148 {
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149 accessor_.reset(new MemoryObjectCache::Accessor(
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150 *that.cache_, id, true /* unique */));
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151 if (accessor_->IsValid())
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152 {
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153 const Item& item = dynamic_cast<const Item&>(accessor_->GetValue());
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154 file_ = &item.GetDicom();
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155 fileSize_ = item.GetMemoryUsage();
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156 }
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157 }
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158 }
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159
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160
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161 ParsedDicomFile& ParsedDicomCache::Accessor::GetDicom() const
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162 {
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163 if (IsValid())
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164 {
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165 assert(file_ != NULL);
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166 return *file_;
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167 }
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168 else
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169 {
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170 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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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 size_t ParsedDicomCache::Accessor::GetFileSize() const
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176 {
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177 if (IsValid())
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178 {
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179 return fileSize_;
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180 }
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181 else
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182 {
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183 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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184 }
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185 }
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186 }