Mercurial > dive4elements > framework
annotate artifact-database/src/main/java/de/intevation/artifactdatabase/Backend.java @ 14:0d16d1bb2df0
Initial checkin of artigact persistents back by database.
artifacts/trunk@29 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 07 Sep 2009 08:41:05 +0000 |
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1 package de.intevation.artifactdatabase; |
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2 |
14
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3 import org.w3c.dom.Document; |
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4 |
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5 import java.util.UUID; |
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6 |
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7 import java.sql.Connection; |
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8 import java.sql.SQLException; |
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9 import java.sql.PreparedStatement; |
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10 import java.sql.Types; |
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11 import java.sql.ResultSet; |
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12 |
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13 import javax.sql.DataSource; |
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14 |
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15 import java.io.IOException; |
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16 import java.io.ByteArrayOutputStream; |
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17 import java.io.ObjectOutputStream; |
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18 |
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19 import java.util.zip.GZIPOutputStream; |
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20 |
13
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21 import de.intevation.artifacts.ArtifactFactory; |
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22 import de.intevation.artifacts.Artifact; |
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23 |
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24 /** |
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25 * @author Sascha L. Teichmann |
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26 */ |
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27 public class Backend |
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28 { |
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29 public static final String SQL_NEXT_ID = |
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30 SQL.get("artifacts.id.nextval"); |
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31 |
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32 public static final String SQL_INSERT = |
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33 SQL.get("artifacts.insert"); |
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34 |
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35 public static final String SQL_UPDATE = |
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36 SQL.get("artifacts.update"); |
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37 |
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38 public static final String SQL_TOUCH = |
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39 SQL.get("artifacts.touch"); |
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40 |
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41 /** |
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42 * Used to wrap the calls to invole database actions. |
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43 */ |
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44 public class ArtifactProxy |
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45 implements Artifact |
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46 { |
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47 protected Artifact original; |
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48 protected int id; |
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49 protected boolean unwritten; |
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50 |
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51 public ArtifactProxy() { |
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52 } |
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53 |
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54 public ArtifactProxy(Artifact original, int id, boolean unwritten) { |
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55 this.original = original; |
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56 this.id = id; |
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57 this.unwritten = unwritten; |
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58 } |
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59 |
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60 public Artifact getOriginal() { |
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61 return original; |
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62 } |
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63 |
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64 public int getId() { |
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65 return id; |
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66 } |
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67 |
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68 public boolean isUnwritten() { |
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69 return unwritten; |
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70 } |
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71 |
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72 public String identifier() { |
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73 return original.identifier(); |
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74 } |
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75 |
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76 public String hash() { |
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77 return original.hash(); |
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78 } |
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79 |
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80 public Document describe(Object context) { |
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81 try { |
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82 return original.describe(context); |
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83 } |
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84 finally { |
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85 touch(this); |
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86 } |
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87 } |
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88 |
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89 public Document advance(Document target, Object context) { |
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90 try { |
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91 return original.advance(target, context); |
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92 } |
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93 finally { |
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94 store(this); |
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95 } |
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96 } |
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97 |
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98 public Document feed(Document data, Object context) { |
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99 try { |
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100 return original.feed(data, context); |
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101 } |
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102 finally { |
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103 store(this); |
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104 } |
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105 } |
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106 |
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107 public byte [] out(Document format, Object context) { |
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108 try { |
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109 return original.out(format, context); |
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110 } |
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111 finally { |
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112 touch(this); |
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113 } |
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114 } |
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115 |
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116 public void setup(String identifier, Object context) { |
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117 original.setup(identifier, context); |
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118 } |
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119 |
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120 public void endOfLife(Object context) { |
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121 original.endOfLife(context); |
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122 } |
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123 |
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124 public byte [] toBytes() { |
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125 try { |
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126 ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
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127 GZIPOutputStream gos = new GZIPOutputStream(bos); |
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128 ObjectOutputStream oos = new ObjectOutputStream(gos); |
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129 |
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130 oos.writeObject(original); |
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131 oos.flush(); |
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132 |
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133 return bos.toByteArray(); |
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134 } |
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135 catch (IOException ioe) { |
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136 throw new RuntimeException(ioe); |
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137 } |
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138 } |
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139 } // class ArtifactProxy |
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140 |
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141 public Backend() { |
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142 } |
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143 |
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144 public Artifact getArtifact(String idenitfier) { |
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145 return null; |
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146 } |
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147 |
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148 public Artifact createArtifactWithFactory( |
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149 ArtifactFactory factory, Object context |
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150 ) { |
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151 UUID uuid = UUID.randomUUID(); |
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152 Artifact artifact = factory.createArtifact( |
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153 uuid.toString(), context); |
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154 |
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155 Long ttl = factory.timeToLiveUntouched( |
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156 artifact, context); |
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157 |
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158 int id = insertDatabase(uuid, ttl); |
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159 |
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160 return new ArtifactProxy(artifact, id, true); |
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161 } |
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162 |
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163 protected int insertDatabase(UUID uuid, Long ttl) { |
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164 Connection connection = null; |
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165 PreparedStatement stmnt_next_id = null; |
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166 PreparedStatement stmnt_insert = null; |
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167 ResultSet res_id = null; |
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168 |
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169 DataSource dataSource = DBConnection.getDataSource(); |
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170 try { |
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171 connection = dataSource.getConnection(); |
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172 try { |
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173 connection.setAutoCommit(false); |
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174 |
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175 stmnt_next_id = connection.prepareStatement(SQL_NEXT_ID); |
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176 stmnt_insert = connection.prepareStatement(SQL_INSERT); |
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177 |
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178 res_id = stmnt_next_id.executeQuery(); |
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179 |
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180 if (!res_id.next()) { |
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181 throw new RuntimeException("No id generated"); |
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182 } |
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183 |
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184 int id = res_id.getInt(1); |
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185 |
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186 stmnt_insert.setInt(1, id); |
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187 stmnt_insert.setString(2, uuid.toString()); |
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188 if (ttl == null) { |
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189 stmnt_insert.setNull(3, Types.BIGINT); |
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190 } |
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191 else { |
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192 stmnt_insert.setLong(3, ttl.longValue()); |
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193 } |
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194 |
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195 stmnt_insert.execute(); |
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196 |
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197 connection.commit(); |
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198 |
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199 return id; |
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200 } |
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201 catch (SQLException sqle) { |
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202 connection.rollback(); |
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203 throw sqle; |
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204 } |
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205 } |
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206 catch (SQLException sqle) { |
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207 sqle.printStackTrace(System.err); |
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208 } |
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209 finally { |
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210 if (res_id != null) { |
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211 try { res_id.close(); } |
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212 catch (SQLException sqle) {} |
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213 } |
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214 if (stmnt_insert != null) { |
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215 try { stmnt_insert.close(); } |
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216 catch (SQLException sqle) {} |
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217 } |
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218 if (stmnt_next_id != null) { |
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219 try { stmnt_next_id.close(); } |
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220 catch (SQLException sqle) {} |
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221 } |
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222 if (connection != null) { |
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223 try { connection.close(); } |
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224 catch (SQLException sqle) {} |
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225 } |
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226 } |
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227 throw new RuntimeException("failed insert artifact into database"); |
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228 } |
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229 |
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230 public void touch(ArtifactProxy proxy) { |
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231 System.err.println("touch: " + proxy); |
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232 if (proxy.isUnwritten()) { |
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233 store(proxy); |
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234 return; |
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235 } |
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236 Connection connection = null; |
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237 PreparedStatement stmnt_touch = null; |
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238 DataSource dataSource = DBConnection.getDataSource(); |
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239 try { |
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240 connection = dataSource.getConnection(); |
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241 try { |
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242 connection.setAutoCommit(false); |
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243 stmnt_touch = connection.prepareStatement(SQL_UPDATE); |
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244 stmnt_touch.setInt(1, proxy.getId()); |
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245 stmnt_touch.execute(); |
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246 connection.commit(); |
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247 } |
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248 catch (SQLException sqle) { |
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249 connection.rollback(); |
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250 } |
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251 } |
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252 catch (SQLException sqle) { |
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253 sqle.printStackTrace(System.err); |
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254 } |
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255 finally { |
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256 if (stmnt_touch != null) { |
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257 try { stmnt_touch.close(); } |
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258 catch (SQLException sqle) {} |
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259 } |
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260 if (connection != null) { |
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261 try { connection.close(); } |
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262 catch (SQLException sqle) {} |
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263 } |
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264 } |
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265 } |
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266 |
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267 public void store(ArtifactProxy proxy) { |
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268 System.err.println("store: " + proxy); |
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269 Connection connection = null; |
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270 PreparedStatement stmnt_update = null; |
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271 DataSource dataSource = DBConnection.getDataSource(); |
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272 try { |
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273 connection = dataSource.getConnection(); |
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274 try { |
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275 connection.setAutoCommit(false); |
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276 stmnt_update = connection.prepareStatement(SQL_UPDATE); |
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277 stmnt_update.setInt(1, proxy.getId()); |
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278 stmnt_update.setBytes(2, proxy.toBytes()); |
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279 stmnt_update.execute(); |
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280 connection.commit(); |
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281 } |
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282 catch (SQLException sqle) { |
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283 connection.rollback(); |
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284 } |
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285 } |
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286 catch (SQLException sqle) { |
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287 sqle.printStackTrace(System.err); |
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288 } |
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289 finally { |
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290 if (stmnt_update != null) { |
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291 try { stmnt_update.close(); } |
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292 catch (SQLException sqle) {} |
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293 } |
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294 if (connection != null) { |
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295 try { connection.close(); } |
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296 catch (SQLException sqle) {} |
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297 } |
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298 } |
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299 } |
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300 |
13
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301 } |
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302 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |