Mercurial > dive4elements > framework
annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Backend.java @ 79:f69e5b87f05f
Implementation to export artifacts as xml (applied patch from issue208 by SLT).
artifacts/trunk@792 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 16 Mar 2010 16:03:06 +0000 |
parents | 4ae4dc99127d |
children | 8447467cef86 |
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1 package de.intevation.artifactdatabase; |
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2 |
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3 import java.sql.Connection; |
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4 import java.sql.SQLException; |
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5 import java.sql.PreparedStatement; |
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6 import java.sql.Types; |
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7 import java.sql.ResultSet; |
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8 |
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9 import javax.sql.DataSource; |
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10 |
13
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11 import de.intevation.artifacts.Artifact; |
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12 import de.intevation.artifacts.ArtifactFactory; |
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13 import de.intevation.artifacts.ArtifactSerializer; |
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14 |
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15 import org.apache.log4j.Logger; |
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16 |
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17 /** |
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18 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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19 */ |
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20 public class Backend |
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21 implements DatabaseCleaner.ArtifactReviver |
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22 { |
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23 private static Logger logger = Logger.getLogger(Backend.class); |
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24 |
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25 public static final String SQL_NEXT_ID = |
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26 SQL.get("artifacts.id.nextval"); |
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27 |
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28 public static final String SQL_INSERT = |
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29 SQL.get("artifacts.insert"); |
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30 |
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31 public static final String SQL_UPDATE = |
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32 SQL.get("artifacts.update"); |
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33 |
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34 public static final String SQL_TOUCH = |
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35 SQL.get("artifacts.touch"); |
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36 |
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37 public static final String SQL_LOAD_BY_GID = |
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38 SQL.get("artifacts.select.gid"); |
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39 |
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40 protected DatabaseCleaner cleaner; |
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41 |
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42 protected FactoryLookup factoryLookup; |
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43 |
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44 public interface FactoryLookup { |
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45 |
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46 ArtifactFactory getArtifactFactory(String factoryName); |
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47 |
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48 } // interface FactoryLookup |
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49 |
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50 public final class PersistentArtifact |
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51 extends Id |
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52 { |
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53 private Artifact artifact; |
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54 private ArtifactSerializer serializer; |
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55 |
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56 public PersistentArtifact( |
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57 Artifact artifact, |
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58 ArtifactSerializer serializer, |
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59 int id |
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60 ) { |
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61 super(id); |
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62 this.artifact = artifact; |
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63 this.serializer = serializer; |
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64 } |
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65 |
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66 public Artifact getArtifact() { |
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67 return artifact; |
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68 } |
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69 |
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70 public ArtifactSerializer getSerializer() { |
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71 return serializer; |
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72 } |
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73 |
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74 public void store() { |
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75 if (logger.isDebugEnabled()) { |
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76 logger.debug("storing artifact id = " + getId()); |
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77 } |
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78 Backend.this.store(this); |
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79 } |
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80 |
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81 public void touch() { |
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82 if (logger.isDebugEnabled()) { |
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83 logger.debug("touching artifact id = " + getId()); |
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84 } |
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85 Backend.this.touch(this); |
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86 } |
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87 } // class ArtifactWithId |
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88 |
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89 public Backend() { |
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90 } |
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91 |
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92 public Backend(DatabaseCleaner cleaner) { |
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93 this.cleaner = cleaner; |
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94 } |
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95 |
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96 public void setFactoryLookup(FactoryLookup factoryLookup) { |
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97 this.factoryLookup = factoryLookup; |
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98 } |
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99 |
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100 public void setCleaner(DatabaseCleaner cleaner) { |
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101 this.cleaner = cleaner; |
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102 } |
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103 |
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104 public String newIdentifier() { |
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105 // TODO: check database for collisions. |
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106 return StringUtils.newUUID(); |
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107 } |
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108 |
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109 public PersistentArtifact storeInitially( |
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110 Artifact artifact, |
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111 ArtifactFactory factory, |
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112 Long ttl |
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113 ) |
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114 throws Exception |
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115 { |
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116 return new PersistentArtifact( |
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117 artifact, |
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118 factory.getSerializer(), |
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119 insertDatabase(artifact, factory, ttl)); |
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120 } |
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121 |
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122 public interface ArtifactLoader { |
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123 |
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124 Object load(ArtifactFactory factory, byte [] bytes, int id); |
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125 |
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126 } // interface ArtifactLoader |
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127 |
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128 |
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129 public PersistentArtifact getArtifact(String identifer) { |
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130 |
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131 return (PersistentArtifact)loadArtifact( |
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132 identifer, |
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133 new ArtifactLoader() { |
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134 |
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135 public Object load( |
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136 ArtifactFactory factory, |
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137 byte [] bytes, |
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138 int id |
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139 ) { |
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140 ArtifactSerializer serializer = factory.getSerializer(); |
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141 |
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142 Artifact artifact = serializer.fromBytes(bytes); |
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143 |
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144 return artifact == null |
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145 ? null |
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146 : new PersistentArtifact(artifact, serializer, id); |
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147 } |
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148 }); |
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149 } |
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150 |
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151 |
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152 |
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153 public Object loadArtifact(String identifer, ArtifactLoader loader) { |
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154 |
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155 if (!StringUtils.checkUUID(identifer)) { |
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156 return null; |
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157 } |
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158 |
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159 Connection connection = null; |
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160 PreparedStatement stmnt_load = null; |
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161 ResultSet load_result = null; |
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162 |
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163 DataSource dataSource = DBConnection.getDataSource(); |
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164 try { |
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165 connection = dataSource.getConnection(); |
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166 stmnt_load = connection.prepareStatement(SQL_LOAD_BY_GID); |
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167 stmnt_load.setString(1, identifer); |
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168 |
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169 load_result = stmnt_load.executeQuery(); |
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170 |
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171 if (!load_result.next()) { |
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172 return null; |
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173 } |
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174 |
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175 int id = load_result.getInt(1); |
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176 long ttl = load_result.getLong(3); |
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177 |
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178 if (!load_result.wasNull()) { // real time to life |
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179 long last_access = load_result.getTimestamp(2).getTime(); |
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180 if (last_access + ttl < System.currentTimeMillis()) { |
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181 artifactOutdated(id); |
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182 return null; |
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183 } |
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184 } |
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185 |
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186 String factoryName = load_result.getString(4); |
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187 |
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188 if (factoryLookup == null) { |
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189 logger.error("factory lookup == null"); |
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190 return null; |
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191 } |
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192 |
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193 ArtifactFactory factory = factoryLookup |
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194 .getArtifactFactory(factoryName); |
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195 |
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196 if (factory == null) { |
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197 logger.error("factory '" + factoryName + "' not found"); |
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198 return null; |
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199 } |
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200 |
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201 byte [] bytes = load_result.getBytes(5); |
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202 |
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203 return loader.load(factory, bytes, id); |
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204 } |
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205 catch (SQLException sqle) { |
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206 logger.error(sqle.getLocalizedMessage(), sqle); |
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207 } |
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208 finally { |
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209 if (load_result != null) { |
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210 try { load_result.close(); } |
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211 catch (SQLException sqle) {} |
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212 } |
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213 if (stmnt_load != null) { |
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214 try { load_result.close(); } |
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215 catch (SQLException sqle) {} |
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216 } |
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217 if (connection != null) { |
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218 try { connection.close(); } |
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219 catch (SQLException sqle) {} |
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Implemented restoring artifacts from database.
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220 } |
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221 } |
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222 return null; |
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223 } |
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224 |
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225 protected void artifactOutdated(int id) { |
79
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Implementation to export artifacts as xml (applied patch from issue208 by SLT).
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226 if (logger.isDebugEnabled()) { |
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227 logger.info("artifactOutdated: id = " + id); |
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Implementation to export artifacts as xml (applied patch from issue208 by SLT).
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228 } |
30
88972c6daa4f
Added a cleanup thread which periodically removes
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229 if (cleaner != null) { |
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230 cleaner.wakeup(); |
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231 } |
15
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Implemented restoring artifacts from database.
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232 } |
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233 |
41
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234 public Artifact reviveArtifact(String factoryName, byte [] bytes) { |
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235 if (factoryLookup == null) { |
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236 logger.error("reviveArtifact: factory lookup == null"); |
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237 return null; |
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238 } |
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239 ArtifactFactory factory = factoryLookup |
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240 .getArtifactFactory(factoryName); |
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241 |
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242 if (factory == null) { |
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243 logger.error("reviveArtifact: no factory '" + factoryName + "' found"); |
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244 return null; |
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245 } |
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246 |
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247 ArtifactSerializer serializer = factory.getSerializer(); |
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248 |
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249 return serializer.fromBytes(bytes); |
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250 } |
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251 |
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252 protected int insertDatabase( |
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253 Artifact artifact, |
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254 ArtifactFactory factory, |
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255 Long ttl |
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256 ) { |
32
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257 String uuid = artifact.identifier(); |
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258 |
14
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259 Connection connection = null; |
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260 PreparedStatement stmnt_next_id = null; |
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261 PreparedStatement stmnt_insert = null; |
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262 ResultSet res_id = null; |
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263 |
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264 DataSource dataSource = DBConnection.getDataSource(); |
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265 try { |
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266 connection = dataSource.getConnection(); |
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267 try { |
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268 connection.setAutoCommit(false); |
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269 |
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270 stmnt_next_id = connection.prepareStatement(SQL_NEXT_ID); |
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271 stmnt_insert = connection.prepareStatement(SQL_INSERT); |
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272 |
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273 res_id = stmnt_next_id.executeQuery(); |
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274 |
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275 if (!res_id.next()) { |
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276 throw new RuntimeException("No id generated"); |
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277 } |
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278 |
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279 int id = res_id.getInt(1); |
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280 |
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281 stmnt_insert.setInt(1, id); |
32
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Re-factored artifact API for better integration of background processing.
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282 stmnt_insert.setString(2, uuid); |
14
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283 if (ttl == null) { |
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284 stmnt_insert.setNull(3, Types.BIGINT); |
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Initial checkin of artigact persistents back by database.
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285 } |
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Initial checkin of artigact persistents back by database.
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286 else { |
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Initial checkin of artigact persistents back by database.
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287 stmnt_insert.setLong(3, ttl.longValue()); |
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Initial checkin of artigact persistents back by database.
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288 } |
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Initial checkin of artigact persistents back by database.
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289 |
41
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290 stmnt_insert.setString(4, factory.getName()); |
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Made serilization more flexible. DB update required!!!
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291 |
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292 stmnt_insert.setBytes( |
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Made serilization more flexible. DB update required!!!
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293 5, |
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|
294 factory.getSerializer().toBytes(artifact)); |
32
c2d53bd30ab8
Re-factored artifact API for better integration of background processing.
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295 |
14
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296 stmnt_insert.execute(); |
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Initial checkin of artigact persistents back by database.
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297 |
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298 connection.commit(); |
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Initial checkin of artigact persistents back by database.
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299 |
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Initial checkin of artigact persistents back by database.
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300 return id; |
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Initial checkin of artigact persistents back by database.
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301 } |
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Initial checkin of artigact persistents back by database.
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302 catch (SQLException sqle) { |
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303 connection.rollback(); |
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Initial checkin of artigact persistents back by database.
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304 throw sqle; |
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305 } |
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306 } |
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Initial checkin of artigact persistents back by database.
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|
307 catch (SQLException sqle) { |
17
5a6b6a3debc7
Integrated logging into artifact database.
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|
308 logger.error(sqle.getLocalizedMessage(), sqle); |
14
0d16d1bb2df0
Initial checkin of artigact persistents back by database.
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309 } |
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Initial checkin of artigact persistents back by database.
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310 finally { |
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Initial checkin of artigact persistents back by database.
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311 if (res_id != null) { |
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312 try { res_id.close(); } |
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313 catch (SQLException sqle) {} |
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Initial checkin of artigact persistents back by database.
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314 } |
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Initial checkin of artigact persistents back by database.
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315 if (stmnt_insert != null) { |
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Initial checkin of artigact persistents back by database.
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316 try { stmnt_insert.close(); } |
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Initial checkin of artigact persistents back by database.
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317 catch (SQLException sqle) {} |
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Initial checkin of artigact persistents back by database.
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318 } |
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319 if (stmnt_next_id != null) { |
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Initial checkin of artigact persistents back by database.
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320 try { stmnt_next_id.close(); } |
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Initial checkin of artigact persistents back by database.
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|
321 catch (SQLException sqle) {} |
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Initial checkin of artigact persistents back by database.
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322 } |
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Initial checkin of artigact persistents back by database.
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323 if (connection != null) { |
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Initial checkin of artigact persistents back by database.
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324 try { connection.close(); } |
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Initial checkin of artigact persistents back by database.
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325 catch (SQLException sqle) {} |
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Initial checkin of artigact persistents back by database.
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326 } |
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Initial checkin of artigact persistents back by database.
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327 } |
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328 throw new RuntimeException("failed insert artifact into database"); |
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329 } |
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330 |
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331 public void touch(PersistentArtifact artifact) { |
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332 |
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333 try { |
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334 Connection connection = null; |
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335 PreparedStatement stmnt_touch = null; |
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336 DataSource dataSource = DBConnection.getDataSource(); |
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337 try { |
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338 connection = dataSource.getConnection(); |
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339 try { |
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340 connection.setAutoCommit(false); |
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341 stmnt_touch = connection.prepareStatement(SQL_TOUCH); |
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342 stmnt_touch.setInt(1, artifact.getId()); |
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343 stmnt_touch.execute(); |
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344 connection.commit(); |
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345 } |
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346 catch (SQLException sqle) { |
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347 connection.rollback(); |
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348 } |
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349 } |
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350 catch (SQLException sqle) { |
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351 logger.error(sqle.getLocalizedMessage(), sqle); |
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352 } |
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353 finally { |
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354 if (stmnt_touch != null) { |
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355 try { stmnt_touch.close(); } |
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356 catch (SQLException sqle) {} |
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357 } |
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358 if (connection != null) { |
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359 try { connection.close(); } |
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360 catch (SQLException sqle) {} |
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361 } |
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362 } |
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363 } |
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364 catch (Exception e) { |
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365 logger.error(e.getLocalizedMessage(), e); |
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366 } |
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367 } |
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368 |
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369 public void store(PersistentArtifact artifact) { |
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370 |
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371 try { |
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372 Connection connection = null; |
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373 PreparedStatement stmnt_update = null; |
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374 DataSource dataSource = DBConnection.getDataSource(); |
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375 try { |
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376 connection = dataSource.getConnection(); |
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377 try { |
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378 connection.setAutoCommit(false); |
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379 stmnt_update = connection.prepareStatement(SQL_UPDATE); |
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380 stmnt_update.setInt(2, artifact.getId()); |
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381 |
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382 byte [] bytes = artifact |
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383 .getSerializer() |
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384 .toBytes(artifact.getArtifact()); |
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385 |
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386 stmnt_update.setBytes(1, bytes); |
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387 stmnt_update.execute(); |
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388 connection.commit(); |
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389 } |
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390 catch (SQLException sqle) { |
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391 connection.rollback(); |
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392 } |
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393 } |
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394 catch (SQLException sqle) { |
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395 logger.error(sqle.getLocalizedMessage(), sqle); |
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396 } |
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397 finally { |
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398 if (stmnt_update != null) { |
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399 try { stmnt_update.close(); } |
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400 catch (SQLException sqle) {} |
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401 } |
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402 if (connection != null) { |
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403 try { connection.close(); } |
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404 catch (SQLException sqle) {} |
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405 } |
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406 } |
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407 } |
26
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408 catch (Exception e) { |
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409 logger.error(e.getLocalizedMessage(), e); |
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410 } |
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411 } |
13
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Added not yet working backend to artifact database.
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412 } |
79
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Implementation to export artifacts as xml (applied patch from issue208 by SLT).
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413 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |