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annotate Framework/Plugins/StorageBackend.h @ 329:b5fb8b77ce4d

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initial commit of ODBC framework
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 10 Aug 2021 20:08:53 +0200
parents 567761f0c1ea
children 16aac0287485
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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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3236894320d6 upgrade to year 2021
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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 Affero 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 * Affero 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 Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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21
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22 #pragma once
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23
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24 #include "../Common/DatabaseManager.h"
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25
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26 #include <orthanc/OrthancCDatabasePlugin.h>
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27
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28 #include <boost/thread/mutex.hpp>
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29
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31 namespace OrthancDatabases
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32 {
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33 class StorageBackend : public boost::noncopyable
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34 {
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35 public:
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36 class IFileContentVisitor : public boost::noncopyable
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37 {
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38 public:
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39 virtual ~IFileContentVisitor()
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40 {
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41 }
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42
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43 virtual void Assign(const std::string& content) = 0;
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44
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45 virtual bool IsSuccess() const = 0;
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46 };
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47
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48 class IAccessor : public boost::noncopyable
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49 {
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50 public:
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51 virtual ~IAccessor()
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52 {
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53 }
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54
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55 virtual void Create(const std::string& uuid,
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56 const void* content,
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57 size_t size,
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58 OrthancPluginContentType type) = 0;
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59
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60 virtual void ReadWhole(IFileContentVisitor& visitor,
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61 const std::string& uuid,
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62 OrthancPluginContentType type) = 0;
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63
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64 virtual void ReadRange(IFileContentVisitor& visitor,
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65 const std::string& uuid,
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66 OrthancPluginContentType type,
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67 uint64_t start,
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68 size_t length) = 0;
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69
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70 virtual void Remove(const std::string& uuid,
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71 OrthancPluginContentType type) = 0;
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72 };
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73
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74 /**
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75 * This class is similar to
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76 * "Orthanc::StatelessDatabaseOperations": It handles retries of
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77 * transactions in the case of collision between multiple
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78 * readers/writers.
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79 **/
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80 class IDatabaseOperation : public boost::noncopyable
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81 {
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82 public:
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83 virtual ~IDatabaseOperation()
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84 {
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85 }
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86
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87 virtual void Execute(IAccessor& accessor) = 0;
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88 };
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89
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90 class ReadWholeOperation;
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91
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92 private:
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93 class StringVisitor;
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94
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95 boost::mutex mutex_;
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96 DatabaseManager manager_;
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97 unsigned int maxRetries_;
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98
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99 protected:
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100 class AccessorBase : public IAccessor
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101 {
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102 private:
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103 boost::mutex::scoped_lock lock_;
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104 DatabaseManager& manager_;
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105
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106 public:
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107 explicit AccessorBase(StorageBackend& backend) :
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108 lock_(backend.mutex_),
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109 manager_(backend.manager_)
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110 {
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111 }
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112
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113 DatabaseManager& GetManager() const
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114 {
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115 return manager_;
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116 }
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117
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118 virtual void Create(const std::string& uuid,
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119 const void* content,
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120 size_t size,
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121 OrthancPluginContentType type) ORTHANC_OVERRIDE;
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122
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123 virtual void ReadWhole(IFileContentVisitor& visitor,
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124 const std::string& uuid,
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125 OrthancPluginContentType type) ORTHANC_OVERRIDE;
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126
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127 virtual void ReadRange(IFileContentVisitor& visitor,
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128 const std::string& uuid,
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129 OrthancPluginContentType type,
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130 uint64_t start,
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131 size_t length) ORTHANC_OVERRIDE;
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132
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133 virtual void Remove(const std::string& uuid,
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134 OrthancPluginContentType type) ORTHANC_OVERRIDE;
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135 };
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136
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137 virtual bool HasReadRange() const = 0;
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138
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139 public:
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140 StorageBackend(IDatabaseFactory* factory /* takes ownership */,
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141 unsigned int maxRetries);
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142
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143 virtual ~StorageBackend()
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144 {
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145 }
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146
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147 virtual IAccessor* CreateAccessor()
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148 {
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149 return new AccessorBase(*this);
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150 }
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151
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152 static void Register(OrthancPluginContext* context,
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153 StorageBackend* backend); // Takes ownership
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154
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155 static void Finalize();
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156
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157 // For unit tests
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158 static void ReadWholeToString(std::string& target,
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159 IAccessor& accessor,
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160 const std::string& uuid,
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161 OrthancPluginContentType type);
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162
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163 // For unit tests
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164 static void ReadRangeToString(std::string& target,
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165 IAccessor& accessor,
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166 const std::string& uuid,
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167 OrthancPluginContentType type,
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168 uint64_t start,
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169 size_t length);
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170
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171 unsigned int GetMaxRetries() const
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172 {
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173 return maxRetries_;
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174 }
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175
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176 void Execute(IDatabaseOperation& operation);
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177 };
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178 }