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annotate Framework/Common/ImplicitTransaction.cpp @ 23:b2ff1cd2907a

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handling of implicit transactions in DatabaseManager
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 12 Jul 2018 10:44:17 +0200
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children 69a94267cdea
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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) 2017-2018 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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20
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21
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22 #include "ImplicitTransaction.h"
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23
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24 #include <Core/Logging.h>
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25 #include <Core/OrthancException.h>
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26
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27 #include <memory>
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28
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29 namespace OrthancDatabases
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30 {
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31 ImplicitTransaction::ImplicitTransaction() :
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32 state_(State_Ready),
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33 readOnly_(true)
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34 {
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35 }
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36
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37
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38 ImplicitTransaction::~ImplicitTransaction()
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39 {
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40 switch (state_)
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41 {
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42 case State_Committed:
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43 case State_Ready:
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44 break;
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45
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46 case State_Executed:
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47 LOG(ERROR) << "An implicit transaction has not been committed";
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48 break;
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49
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50 default:
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51 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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52 }
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53 }
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54
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55
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56 void ImplicitTransaction::Rollback()
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57 {
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58 LOG(ERROR) << "Cannot rollback an implicit transaction";
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59 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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60 }
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61
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62
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63 void ImplicitTransaction::Commit()
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64 {
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65 switch (state_)
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66 {
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67 case State_Ready:
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68 LOG(ERROR) << "Cannot commit an implicit transaction that has not been executed yet";
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69 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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70
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71 case State_Executed:
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72 state_ = State_Committed;
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73 break;
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74
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75 case State_Committed:
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76 LOG(ERROR) << "Cannot commit twice an implicit transaction";
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77 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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78
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79 default:
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80 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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81 }
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82 }
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83
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84
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85 void ImplicitTransaction::CheckStateForExecution()
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86 {
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87 switch (state_)
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88 {
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89 case State_Ready:
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90 // OK
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91 break;
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92
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93 case State_Executed:
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94 #if defined(NDEBUG)
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95 // Release build. Ignore such errors.
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96 LOG(INFO) << "Cannot execute more than one statement in an implicit transaction";
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97 break;
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98 #else
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99 /**
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100 * Debug build. This allows to detect errors wrt. the handling
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101 * of transactions in the Orthanc core.
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102 *
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103 * In Orthanc <= 1.3.2: problems in "/changes" (a transaction
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104 * was missing because of GetPublicId()).
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105 **/
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106 LOG(ERROR) << "Cannot execute more than one statement in an implicit transaction";
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107 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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108 #endif
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109
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110 case State_Committed:
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111 LOG(ERROR) << "Cannot commit twice an implicit transaction";
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112 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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113
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114 default:
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115 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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116 }
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117 }
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118
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119
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120 IResult* ImplicitTransaction::Execute(IPrecompiledStatement& statement,
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121 const Dictionary& parameters)
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122 {
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123 CheckStateForExecution();
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124 std::auto_ptr<IResult> result(ExecuteInternal(statement, parameters));
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125
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126 if (!statement.IsReadOnly())
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127 {
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128 readOnly_ = false;
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129 }
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130
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131 state_ = State_Executed;
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132 return result.release();
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133 }
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134
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135
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136 void ImplicitTransaction::ExecuteWithoutResult(IPrecompiledStatement& statement,
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137 const Dictionary& parameters)
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138 {
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139 CheckStateForExecution();
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140 ExecuteWithoutResultInternal(statement, parameters);
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141
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142 if (!statement.IsReadOnly())
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143 {
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144 readOnly_ = false;
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145 }
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146
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147 state_ = State_Executed;
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148 }
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149 }
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150