Mercurial > hg > orthanc-databases

annotate Framework/Plugins/StorageBackend.h @ 395:a7a029043670 db-protobuf

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integration mainline->db-protobuf
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 05 Apr 2023 14:53:57 +0200
parents 3d6886f3e5b3
children ecd0b719cff5
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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) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Affero General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Affero General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Affero General Public License
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19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 **/
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22
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23 #pragma once
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24
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25 #include "../Common/DatabaseManager.h"
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26
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27 #include <orthanc/OrthancCDatabasePlugin.h>
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28
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29 #include <boost/thread/mutex.hpp>
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30
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32 namespace OrthancDatabases
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33 {
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34 class StorageBackend : public boost::noncopyable
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35 {
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36 public:
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37 class IFileContentVisitor : public boost::noncopyable
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38 {
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39 public:
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40 virtual ~IFileContentVisitor()
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41 {
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42 }
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43
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44 virtual void Assign(const std::string& content) = 0;
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45
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46 virtual bool IsSuccess() const = 0;
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47 };
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48
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49 class IAccessor : public boost::noncopyable
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50 {
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51 public:
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52 virtual ~IAccessor()
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53 {
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54 }
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55
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56 virtual void Create(const std::string& uuid,
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57 const void* content,
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58 size_t size,
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59 OrthancPluginContentType type) = 0;
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60
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61 virtual void ReadWhole(IFileContentVisitor& visitor,
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62 const std::string& uuid,
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63 OrthancPluginContentType type) = 0;
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64
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65 virtual void ReadRange(IFileContentVisitor& visitor,
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66 const std::string& uuid,
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67 OrthancPluginContentType type,
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68 uint64_t start,
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69 size_t length) = 0;
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70
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71 virtual void Remove(const std::string& uuid,
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72 OrthancPluginContentType type) = 0;
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73 };
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74
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75 /**
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76 * This class is similar to
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77 * "Orthanc::StatelessDatabaseOperations": It handles retries of
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78 * transactions in the case of collision between multiple
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79 * readers/writers.
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80 **/
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81 class IDatabaseOperation : public boost::noncopyable
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82 {
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83 public:
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84 virtual ~IDatabaseOperation()
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85 {
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86 }
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87
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88 virtual void Execute(IAccessor& accessor) = 0;
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89 };
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90
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91 class ReadWholeOperation;
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92
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93 private:
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94 class StringVisitor;
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95
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96 boost::mutex mutex_;
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97 DatabaseManager manager_;
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98 unsigned int maxRetries_;
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99
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100 protected:
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101 class AccessorBase : public IAccessor
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102 {
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103 private:
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104 boost::mutex::scoped_lock lock_;
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105 DatabaseManager& manager_;
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106
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107 public:
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108 explicit AccessorBase(StorageBackend& backend) :
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109 lock_(backend.mutex_),
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110 manager_(backend.manager_)
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111 {
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112 }
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113
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114 DatabaseManager& GetManager() const
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115 {
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116 return manager_;
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117 }
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118
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119 virtual void Create(const std::string& uuid,
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120 const void* content,
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121 size_t size,
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122 OrthancPluginContentType type) ORTHANC_OVERRIDE;
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123
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124 virtual void ReadWhole(IFileContentVisitor& visitor,
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125 const std::string& uuid,
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126 OrthancPluginContentType type) ORTHANC_OVERRIDE;
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127
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128 virtual void ReadRange(IFileContentVisitor& visitor,
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129 const std::string& uuid,
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130 OrthancPluginContentType type,
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131 uint64_t start,
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132 size_t length) ORTHANC_OVERRIDE;
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133
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134 virtual void Remove(const std::string& uuid,
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135 OrthancPluginContentType type) ORTHANC_OVERRIDE;
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136 };
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137
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138 virtual bool HasReadRange() const = 0;
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139
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140 public:
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141 StorageBackend(IDatabaseFactory* factory /* takes ownership */,
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142 unsigned int maxRetries);
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143
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144 virtual ~StorageBackend()
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145 {
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146 }
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147
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148 virtual IAccessor* CreateAccessor()
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149 {
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150 return new AccessorBase(*this);
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151 }
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152
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153 static void Register(OrthancPluginContext* context,
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154 StorageBackend* backend); // Takes ownership
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155
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156 static void Finalize();
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157
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158 // For unit tests
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159 static void ReadWholeToString(std::string& target,
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160 IAccessor& accessor,
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161 const std::string& uuid,
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162 OrthancPluginContentType type);
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163
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164 // For unit tests
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165 static void ReadRangeToString(std::string& target,
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166 IAccessor& accessor,
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167 const std::string& uuid,
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168 OrthancPluginContentType type,
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169 uint64_t start,
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170 size_t length);
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171
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172 unsigned int GetMaxRetries() const
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173 {
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174 return maxRetries_;
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175 }
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176
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177 void Execute(IDatabaseOperation& operation);
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178 };
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179 }