Mercurial > hg > orthanc-databases

annotate Framework/Common/DatabaseManager.h @ 234:d1b124d116c1

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PostgreSQL index plugin handles retries for collisions between multiple writers
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 08 Apr 2021 10:50:01 +0200
parents 0a9b48d19643
children 35598014f140
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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) 2017-2021 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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20
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21
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22 #pragma once
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24 #include "IDatabase.h"
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25 #include "StatementLocation.h"
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27 #include <Compatibility.h> // For std::unique_ptr<>
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28 #include <Enumerations.h>
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30 #include <memory>
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32
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33 namespace OrthancDatabases
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34 {
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35 /**
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36 * WARNING: In PostgreSQL releases <= 3.3 and in MySQL releases <=
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37 * 3.0, this class was protected by a mutex. It is now assumed that
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38 * locking must be implemented at a higher level.
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39 **/
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40 class DatabaseManager : public boost::noncopyable
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41 {
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42 private:
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43 typedef std::map<StatementLocation, IPrecompiledStatement*> CachedStatements;
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44
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45 std::unique_ptr<IDatabase> database_;
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46 std::unique_ptr<ITransaction> transaction_;
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47 CachedStatements cachedStatements_;
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48 Dialect dialect_;
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50 IDatabase& GetDatabase()
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51 {
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52 return *database_;
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53 }
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54
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55 void CloseIfUnavailable(Orthanc::ErrorCode e);
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56
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57 IPrecompiledStatement* LookupCachedStatement(const StatementLocation& location) const;
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58
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59 IPrecompiledStatement& CacheStatement(const StatementLocation& location,
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60 const Query& query);
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61
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62 ITransaction& GetTransaction();
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63
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64 void ReleaseImplicitTransaction();
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66 public:
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67 explicit DatabaseManager(IDatabase* database); // Takes ownership
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69 ~DatabaseManager()
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70 {
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71 Close();
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72 }
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74 Dialect GetDialect() const
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75 {
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76 return dialect_;
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77 }
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78
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79 void Close();
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80
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81 void StartTransaction(TransactionType type);
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82
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83 void CommitTransaction();
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84
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85 void RollbackTransaction();
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86
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88 // This class is only used in the "StorageBackend"
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89 class Transaction : public boost::noncopyable
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90 {
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91 private:
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92 DatabaseManager& manager_;
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93 IDatabase& database_;
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94 bool committed_;
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96 public:
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97 explicit Transaction(DatabaseManager& manager,
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98 TransactionType type);
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99
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100 ~Transaction();
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101
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102 void Commit();
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103
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104 DatabaseManager& GetManager()
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105 {
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106 return manager_;
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107 }
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108
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109 IDatabase& GetDatabase()
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110 {
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111 return database_;
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112 }
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113 };
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115
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116 class StatementBase : public boost::noncopyable
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117 {
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118 private:
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119 DatabaseManager& manager_;
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120 ITransaction& transaction_;
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121 std::unique_ptr<Query> query_;
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122 std::unique_ptr<IResult> result_;
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124 IResult& GetResult() const;
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125
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126 protected:
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127 DatabaseManager& GetManager() const
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128 {
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129 return manager_;
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130 }
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132 ITransaction& GetTransaction() const
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133 {
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134 return transaction_;
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135 }
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136
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137 void SetQuery(Query* query);
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138
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139 void SetResult(IResult* result);
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141 void ClearResult()
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142 {
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143 result_.reset();
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144 }
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146 Query* ReleaseQuery()
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147 {
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148 return query_.release();
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149 }
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150
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151 public:
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152 explicit StatementBase(DatabaseManager& manager);
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153
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154 virtual ~StatementBase();
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155
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156 // Used only by SQLite
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157 IDatabase& GetDatabase()
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158 {
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159 return manager_.GetDatabase();
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160 }
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161
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162 void SetReadOnly(bool readOnly);
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163
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164 void SetParameterType(const std::string& parameter,
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165 ValueType type);
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166
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167 bool IsDone() const;
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168
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169 void Next();
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170
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171 size_t GetResultFieldsCount() const;
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172
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173 void SetResultFieldType(size_t field,
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174 ValueType type);
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175
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176 const IValue& GetResultField(size_t index) const;
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177 };
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178
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179
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180 class CachedStatement : public StatementBase
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181 {
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182 private:
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183 StatementLocation location_;
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184 IPrecompiledStatement* statement_;
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185
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186 public:
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187 CachedStatement(const StatementLocation& location,
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188 DatabaseManager& manager,
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189 const std::string& sql);
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190
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191 void Execute()
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192 {
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193 Dictionary parameters;
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194 Execute(parameters);
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195 }
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196
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197 void Execute(const Dictionary& parameters);
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198 };
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199
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200
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201 class StandaloneStatement : public StatementBase
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202 {
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203 private:
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204 std::unique_ptr<IPrecompiledStatement> statement_;
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205
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206 public:
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207 StandaloneStatement(DatabaseManager& manager,
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208 const std::string& sql);
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209
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210 virtual ~StandaloneStatement();
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211
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212 void Execute()
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213 {
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214 Dictionary parameters;
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215 Execute(parameters);
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216 }
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217
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218 void Execute(const Dictionary& parameters);
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219 };
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220 };
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221 }