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annotate Framework/Plugins/StorageBackend.h @ 522:c49136b34891 large-queries tip

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author Alain Mazy <am@orthanc.team>
date Fri, 05 Jul 2024 09:15:54 +0200
parents 54d518dcd74a
children
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Affero General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Affero General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Affero General Public License
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20 * along with this program. If not, see <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 #pragma once
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25
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26 #include "../Common/DatabaseManager.h"
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27
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28 #include <orthanc/OrthancCDatabasePlugin.h>
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29
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30 #include <boost/thread/mutex.hpp>
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31
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32
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33 namespace OrthancDatabases
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34 {
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35 class StorageBackend : public boost::noncopyable
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36 {
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37 public:
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38 class IFileContentVisitor : public boost::noncopyable
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39 {
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40 public:
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41 virtual ~IFileContentVisitor()
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42 {
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43 }
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44
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45 virtual void Assign(const std::string& content) = 0;
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46
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47 virtual bool IsSuccess() const = 0;
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48 };
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49
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50 class IAccessor : public boost::noncopyable
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51 {
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52 public:
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53 virtual ~IAccessor()
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54 {
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55 }
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56
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57 virtual void Create(const std::string& uuid,
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58 const void* content,
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59 size_t size,
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60 OrthancPluginContentType type) = 0;
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61
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62 virtual void ReadWhole(IFileContentVisitor& visitor,
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63 const std::string& uuid,
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64 OrthancPluginContentType type) = 0;
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65
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66 virtual void ReadRange(IFileContentVisitor& visitor,
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67 const std::string& uuid,
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68 OrthancPluginContentType type,
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69 uint64_t start,
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70 size_t length) = 0;
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71
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72 virtual void Remove(const std::string& uuid,
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73 OrthancPluginContentType type) = 0;
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74 };
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75
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76 /**
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77 * This class is similar to
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78 * "Orthanc::StatelessDatabaseOperations": It handles retries of
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79 * transactions in the case of collision between multiple
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80 * readers/writers.
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81 **/
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82 class IDatabaseOperation : public boost::noncopyable
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83 {
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84 public:
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85 virtual ~IDatabaseOperation()
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86 {
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87 }
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88
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89 virtual void Execute(IAccessor& accessor) = 0;
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90 };
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92 class ReadWholeOperation;
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93
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94 private:
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95 class StringVisitor;
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96
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97 boost::mutex mutex_;
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98 DatabaseManager manager_;
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99 unsigned int maxRetries_;
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100
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101 protected:
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102 class AccessorBase : public IAccessor
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103 {
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104 private:
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105 boost::mutex::scoped_lock lock_;
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106 DatabaseManager& manager_;
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107
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108 public:
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109 explicit AccessorBase(StorageBackend& backend) :
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110 lock_(backend.mutex_),
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111 manager_(backend.manager_)
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112 {
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113 }
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114
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115 DatabaseManager& GetManager() const
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116 {
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117 return manager_;
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118 }
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119
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120 virtual void Create(const std::string& uuid,
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121 const void* content,
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122 size_t size,
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123 OrthancPluginContentType type) ORTHANC_OVERRIDE;
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124
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125 virtual void ReadWhole(IFileContentVisitor& visitor,
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126 const std::string& uuid,
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127 OrthancPluginContentType type) ORTHANC_OVERRIDE;
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128
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129 virtual void ReadRange(IFileContentVisitor& visitor,
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130 const std::string& uuid,
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131 OrthancPluginContentType type,
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132 uint64_t start,
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133 size_t length) ORTHANC_OVERRIDE;
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134
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135 virtual void Remove(const std::string& uuid,
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136 OrthancPluginContentType type) ORTHANC_OVERRIDE;
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137 };
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138
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139 virtual bool HasReadRange() const = 0;
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140
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141 public:
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142 StorageBackend(IDatabaseFactory* factory /* takes ownership */,
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143 unsigned int maxRetries);
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144
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145 virtual ~StorageBackend()
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146 {
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147 }
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148
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149 virtual IAccessor* CreateAccessor()
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150 {
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151 return new AccessorBase(*this);
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152 }
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153
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154 static void Register(OrthancPluginContext* context,
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155 StorageBackend* backend); // Takes ownership
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156
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157 static void Finalize();
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158
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159 // For unit tests
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160 static void ReadWholeToString(std::string& target,
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161 IAccessor& accessor,
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162 const std::string& uuid,
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163 OrthancPluginContentType type);
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164
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165 // For unit tests
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166 static void ReadRangeToString(std::string& target,
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167 IAccessor& accessor,
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168 const std::string& uuid,
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169 OrthancPluginContentType type,
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170 uint64_t start,
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171 size_t length);
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172
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173 unsigned int GetMaxRetries() const
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174 {
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175 return maxRetries_;
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176 }
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177
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178 void Execute(IDatabaseOperation& operation);
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179 };
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180 }