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annotate Framework/Plugins/StorageBackend.h @ 246:483af3f35a4b

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turning ResultFileValue into a base class, and implement its primitives for PostgreSQL
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 14 Apr 2021 08:42:31 +0200
parents b97a537f4613
children 33fa478c119a
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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
1
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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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20
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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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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 private:
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75 class StringVisitor;
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76
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77 boost::mutex mutex_;
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78 std::unique_ptr<DatabaseManager> manager_;
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79
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80 DatabaseManager& GetManager();
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81
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82 protected:
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83 class AccessorBase : public IAccessor
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84 {
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85 private:
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86 boost::mutex::scoped_lock lock_;
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87 DatabaseManager& manager_;
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88
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89 public:
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90 AccessorBase(StorageBackend& backend) :
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91 lock_(backend.mutex_),
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92 manager_(backend.GetManager())
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93 {
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94 }
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95
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96 DatabaseManager& GetManager() const
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97 {
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98 return manager_;
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99 }
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100
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101 virtual void Create(const std::string& uuid,
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102 const void* content,
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103 size_t size,
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104 OrthancPluginContentType type);
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105
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106 virtual void ReadWhole(IFileContentVisitor& visitor,
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107 const std::string& uuid,
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108 OrthancPluginContentType type);
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109
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110 virtual void ReadRange(IFileContentVisitor& visitor,
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111 const std::string& uuid,
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112 OrthancPluginContentType type,
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113 uint64_t start,
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114 size_t length);
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115
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116 virtual void Remove(const std::string& uuid,
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117 OrthancPluginContentType type);
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118 };
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119
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120 void SetDatabase(IDatabase* database); // Takes ownership
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121
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122 virtual bool HasReadRange() const = 0;
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123
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124 public:
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125 virtual ~StorageBackend()
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126 {
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127 }
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128
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129 virtual IAccessor* CreateAccessor()
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130 {
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131 return new AccessorBase(*this);
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132 }
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133
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134 static void Register(OrthancPluginContext* context,
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135 StorageBackend* backend); // Takes ownership
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136
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137 static void Finalize();
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138
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139 // For unit tests
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140 static void ReadWholeToString(std::string& target,
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141 IAccessor& accessor,
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142 const std::string& uuid,
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143 OrthancPluginContentType type);
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144
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145 // For unit tests
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146 static void ReadRangeToString(std::string& target,
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147 IAccessor& accessor,
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148 const std::string& uuid,
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149 OrthancPluginContentType type,
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150 uint64_t start,
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151 size_t length);
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152 };
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153 }