Mercurial > dive4elements > framework
annotate artifact-database/src/main/java/de/intevation/artifactdatabase/ArtifactDatabaseImpl.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 | d4c4c23847f5 |
children | 8447467cef86 |
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1 package de.intevation.artifactdatabase; |
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2 |
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3 import de.intevation.artifactdatabase.Backend.PersistentArtifact; |
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4 |
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5 import de.intevation.artifacts.Artifact; |
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6 import de.intevation.artifacts.ArtifactDatabase; |
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7 import de.intevation.artifacts.ArtifactDatabaseException; |
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8 import de.intevation.artifacts.ArtifactFactory; |
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9 import de.intevation.artifacts.ArtifactNamespaceContext; |
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10 import de.intevation.artifacts.CallContext; |
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11 import de.intevation.artifacts.CallMeta; |
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12 import de.intevation.artifacts.Service; |
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13 import de.intevation.artifacts.ServiceFactory; |
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14 |
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15 import java.io.IOException; |
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16 import java.io.OutputStream; |
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17 |
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18 import java.security.MessageDigest; |
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19 import java.security.NoSuchAlgorithmException; |
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20 |
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21 import java.util.ArrayList; |
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22 import java.util.HashMap; |
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23 import java.util.HashSet; |
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24 import java.util.List; |
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25 |
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26 import org.apache.commons.codec.binary.Base64; |
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27 |
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28 import org.apache.log4j.Logger; |
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29 |
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30 import org.w3c.dom.Document; |
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31 import org.w3c.dom.Element; |
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32 |
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33 /** |
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34 * @author Sascha L. Teichmann |
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35 */ |
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36 public class ArtifactDatabaseImpl |
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37 implements ArtifactDatabase, Id.Filter, Backend.FactoryLookup |
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38 { |
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39 private static Logger logger = |
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40 Logger.getLogger(ArtifactDatabaseImpl.class); |
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41 |
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42 public static final String NO_SUCH_FACTORY = |
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43 "No such factory"; |
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44 |
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45 public static final String NO_SUCH_ARTIFACT = |
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46 "No such artifact"; |
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47 |
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48 public static final String NOT_IN_BACKGROUND = |
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49 "Not in background"; |
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50 |
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51 public static final String INVALID_CALL_STATE = |
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52 "Invalid after call state"; |
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53 |
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54 public static final String CREATION_FAILED = |
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55 "Creation of artifact failed"; |
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56 |
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57 public static final String INTERNAL_ERROR = |
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58 "Creation of artifact failed"; |
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59 |
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60 public static final String NO_SUCH_SERVICE = |
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61 "No such service"; |
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62 |
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63 public static final String DIGEST_ALGORITHM = |
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64 "SHA-1"; |
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65 |
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66 public class CallContextImpl |
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67 implements CallContext |
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68 { |
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69 protected PersistentArtifact artifact; |
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70 protected int action; |
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71 protected CallMeta callMeta; |
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72 protected HashMap customValues; |
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73 |
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74 public CallContextImpl( |
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75 PersistentArtifact artifact, |
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76 int action, |
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77 CallMeta callMeta |
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78 ) { |
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79 this.artifact = artifact; |
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80 this.action = action; |
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81 this.callMeta = callMeta; |
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82 } |
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83 |
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84 public void afterCall(int action) { |
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85 this.action = action; |
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86 if (action == BACKGROUND) { |
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87 addIdToBackground(artifact.getId()); |
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88 } |
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89 } |
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90 |
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91 public void afterBackground(int action) { |
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92 if (this.action != BACKGROUND) { |
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93 throw new IllegalStateException(NOT_IN_BACKGROUND); |
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94 } |
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95 fromBackground(artifact, action); |
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96 } |
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97 |
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98 public Object globalContext() { |
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99 return context; |
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100 } |
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101 |
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102 public ArtifactDatabase getDatabase() { |
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103 return ArtifactDatabaseImpl.this; |
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104 } |
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105 |
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106 public CallMeta getMeta() { |
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107 return callMeta; |
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108 } |
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109 |
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110 public void postCall() { |
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111 switch (action) { |
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112 case NOTHING: |
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113 break; |
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114 case TOUCH: |
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115 artifact.touch(); |
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116 break; |
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117 case STORE: |
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118 artifact.store(); |
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119 break; |
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120 case BACKGROUND: |
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121 logger.warn("BACKGROUND processing is not fully implemented, yet!"); |
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122 artifact.store(); |
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123 break; |
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124 default: |
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125 logger.error(INVALID_CALL_STATE + ": " + action); |
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126 throw new IllegalStateException(INVALID_CALL_STATE); |
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127 } |
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128 } |
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129 |
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130 public Object getContextValue(Object key) { |
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131 return customValues != null |
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132 ? customValues.get(key) |
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133 : null; |
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134 } |
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135 |
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136 public Object putContextValue(Object key, Object value) { |
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137 if (customValues == null) { |
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138 customValues = new HashMap(); |
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139 } |
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140 return customValues.put(key, value); |
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141 } |
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142 } // class CallContextImpl |
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143 |
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144 public class DeferredOutputImpl |
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145 implements DeferredOutput |
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146 { |
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147 protected PersistentArtifact artifact; |
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148 protected Document format; |
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149 protected CallMeta callMeta; |
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150 |
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151 public DeferredOutputImpl() { |
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152 } |
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153 |
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154 public DeferredOutputImpl( |
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155 PersistentArtifact artifact, |
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156 Document format, |
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157 CallMeta callMeta |
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158 ) { |
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159 this.artifact = artifact; |
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160 this.format = format; |
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161 this.callMeta = callMeta; |
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162 } |
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163 |
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164 public void write(OutputStream output) throws IOException { |
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165 |
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166 CallContextImpl cc = new CallContextImpl( |
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167 artifact, CallContext.TOUCH, callMeta); |
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168 |
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169 try { |
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170 artifact.getArtifact().out(format, output, cc); |
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171 } |
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172 finally { |
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173 cc.postCall(); |
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174 } |
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175 } |
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176 } // class DeferredOutputImpl |
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177 |
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178 protected String [][] factoryNamesAndDescription; |
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179 protected HashMap name2factory; |
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180 |
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181 protected String [][] serviceNamesAndDescription; |
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182 protected HashMap name2service; |
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183 |
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184 protected Backend backend; |
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185 protected Object context; |
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186 |
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187 protected byte [] exportSecret; |
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188 |
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189 protected HashSet backgroundIds; |
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190 |
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191 public ArtifactDatabaseImpl() { |
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192 } |
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193 |
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194 public ArtifactDatabaseImpl(FactoryBootstrap bootstrap) { |
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195 this(bootstrap, null); |
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196 } |
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197 |
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198 public ArtifactDatabaseImpl(FactoryBootstrap bootstrap, Backend backend) { |
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199 |
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200 backgroundIds = new HashSet(); |
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201 |
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202 setupArtifactFactories(bootstrap); |
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203 setupServices(bootstrap); |
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204 |
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205 context = bootstrap.getContext(); |
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206 exportSecret = bootstrap.getExportSecret(); |
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207 |
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208 wireWithBackend(backend); |
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209 } |
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210 |
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211 protected void setupArtifactFactories(FactoryBootstrap bootstrap) { |
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212 name2factory = new HashMap(); |
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213 |
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214 ArtifactFactory [] factories = bootstrap.getArtifactFactories(); |
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215 factoryNamesAndDescription = new String[factories.length][]; |
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216 |
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217 for (int i = 0; i < factories.length; ++i) { |
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218 |
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219 ArtifactFactory factory = factories[i]; |
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220 |
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221 String name = factory.getName(); |
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222 String description = factory.getDescription(); |
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223 |
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224 factoryNamesAndDescription[i] = |
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225 new String [] { name, description }; |
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226 |
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227 name2factory.put(name, factory); |
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228 } |
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229 } |
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230 |
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231 protected void setupServices(FactoryBootstrap bootstrap) { |
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232 |
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233 name2service = new HashMap(); |
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234 |
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235 ServiceFactory [] serviceFactories = |
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236 bootstrap.getServiceFactories(); |
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237 |
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238 serviceNamesAndDescription = |
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239 new String[serviceFactories.length][]; |
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240 |
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241 for (int i = 0; i < serviceFactories.length; ++i) { |
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242 ServiceFactory factory = serviceFactories[i]; |
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243 |
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244 String name = factory.getName(); |
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245 String description = factory.getDescription(); |
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246 |
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247 serviceNamesAndDescription[i] = |
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248 new String [] { name, description }; |
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249 |
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250 name2service.put( |
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251 name, |
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252 factory.createService(bootstrap.getContext())); |
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253 } |
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254 |
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255 } |
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256 |
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257 public void wireWithBackend(Backend backend) { |
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258 if (backend != null) { |
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259 this.backend = backend; |
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260 backend.setFactoryLookup(this); |
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261 } |
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262 } |
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263 |
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264 protected void fromBackground(PersistentArtifact artifact, int action) { |
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265 logger.warn("BACKGROUND processing is not fully implemented, yet!"); |
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266 switch (action) { |
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267 case CallContext.NOTHING: |
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268 break; |
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269 case CallContext.TOUCH: |
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270 artifact.touch(); |
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271 break; |
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272 case CallContext.STORE: |
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273 artifact.store(); |
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274 break; |
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275 default: |
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276 logger.warn("operation not allowed in fromBackground"); |
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277 } |
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278 removeIdFromBackground(artifact.getId()); |
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279 } |
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280 |
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281 protected void removeIdFromBackground(int id) { |
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282 synchronized (backgroundIds) { |
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283 backgroundIds.remove(Integer.valueOf(id)); |
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284 } |
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285 } |
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286 |
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287 protected void addIdToBackground(int id) { |
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288 synchronized (backgroundIds) { |
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289 backgroundIds.add(Integer.valueOf(id)); |
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290 } |
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291 } |
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292 |
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293 public List filterIds(List ids) { |
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294 int N = ids.size(); |
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295 ArrayList out = new ArrayList(N); |
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296 synchronized (backgroundIds) { |
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297 for (int i = 0; i < N; ++i) { |
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298 Id id = (Id)ids.get(i); |
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299 if (!backgroundIds.contains(Integer.valueOf(id.getId()))) { |
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300 out.add(id); |
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301 } |
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302 } |
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303 } |
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304 return out; |
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305 } |
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306 |
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307 public String [][] artifactFactoryNamesAndDescriptions() { |
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308 return factoryNamesAndDescription; |
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309 } |
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310 |
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311 public ArtifactFactory getInternalArtifactFactory(String factoryName) { |
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312 return getArtifactFactory(factoryName); |
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313 } |
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314 |
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315 public ArtifactFactory getArtifactFactory(String factoryName) { |
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316 return (ArtifactFactory)name2factory.get(factoryName); |
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317 } |
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318 |
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319 public Document createArtifactWithFactory( |
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320 String factoryName, |
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321 CallMeta callMeta, |
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322 Document data |
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323 ) |
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324 throws ArtifactDatabaseException |
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325 { |
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326 ArtifactFactory factory = getArtifactFactory(factoryName); |
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327 |
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328 if (factory == null) { |
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329 throw new ArtifactDatabaseException(NO_SUCH_FACTORY); |
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330 } |
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331 |
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332 Artifact artifact = factory.createArtifact( |
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333 backend.newIdentifier(), |
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334 context, |
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335 data); |
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336 |
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337 if (artifact == null) { |
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338 throw new ArtifactDatabaseException(CREATION_FAILED); |
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339 } |
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340 |
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341 PersistentArtifact persistentArtifact; |
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342 |
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343 try { |
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344 persistentArtifact = backend.storeInitially( |
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345 artifact, |
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346 factory, |
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347 factory.timeToLiveUntouched(artifact, context)); |
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348 } |
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349 catch (Exception e) { |
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350 logger.error(e.getLocalizedMessage(), e); |
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351 throw new ArtifactDatabaseException(CREATION_FAILED); |
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352 } |
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353 |
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354 CallContextImpl cc = new CallContextImpl( |
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355 persistentArtifact, CallContext.NOTHING, callMeta); |
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356 |
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357 try { |
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358 return artifact.describe(null, cc); |
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359 } |
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360 finally { |
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361 cc.postCall(); |
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362 } |
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363 } |
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364 |
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365 public Document describe(String identifier, Document data, CallMeta callMeta) |
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366 throws ArtifactDatabaseException |
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367 { |
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368 // TODO: Handle background tasks |
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369 PersistentArtifact artifact = backend.getArtifact(identifier); |
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370 |
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371 if (artifact == null) { |
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372 throw new ArtifactDatabaseException(NO_SUCH_ARTIFACT); |
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373 } |
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374 |
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375 CallContextImpl cc = new CallContextImpl( |
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376 artifact, CallContext.TOUCH, callMeta); |
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377 |
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378 try { |
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379 return artifact.getArtifact().describe(data, cc); |
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380 } |
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381 finally { |
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382 cc.postCall(); |
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383 } |
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384 } |
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385 |
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386 public Document advance(String identifier, Document target, CallMeta callMeta) |
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387 throws ArtifactDatabaseException |
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388 { |
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389 // TODO: Handle background tasks |
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390 PersistentArtifact artifact = backend.getArtifact(identifier); |
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391 |
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392 if (artifact == null) { |
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393 throw new ArtifactDatabaseException(NO_SUCH_ARTIFACT); |
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394 } |
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395 |
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396 CallContextImpl cc = new CallContextImpl( |
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397 artifact, CallContext.STORE, callMeta); |
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398 |
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399 try { |
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400 return artifact.getArtifact().advance(target, cc); |
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401 } |
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402 finally { |
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403 cc.postCall(); |
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404 } |
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405 } |
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406 |
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407 public Document feed(String identifier, Document data, CallMeta callMeta) |
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408 throws ArtifactDatabaseException |
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409 { |
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410 // TODO: Handle background tasks |
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411 PersistentArtifact artifact = backend.getArtifact(identifier); |
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412 |
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413 if (artifact == null) { |
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414 throw new ArtifactDatabaseException(NO_SUCH_ARTIFACT); |
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415 } |
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416 |
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417 CallContextImpl cc = new CallContextImpl( |
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418 artifact, CallContext.STORE, callMeta); |
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419 |
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420 try { |
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421 return artifact.getArtifact().feed(data, cc); |
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422 } |
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423 finally { |
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424 cc.postCall(); |
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425 } |
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426 } |
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427 |
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428 public DeferredOutput out(String identifier, Document format, CallMeta callMeta) |
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429 throws ArtifactDatabaseException |
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430 { |
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431 // TODO: Handle background tasks |
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432 PersistentArtifact artifact = backend.getArtifact(identifier); |
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433 |
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434 if (artifact == null) { |
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435 throw new ArtifactDatabaseException(NO_SUCH_ARTIFACT); |
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436 } |
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437 |
48
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438 return new DeferredOutputImpl(artifact, format, callMeta); |
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439 } |
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440 |
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441 public Document exportArtifact(String artifact, CallMeta callMeta) |
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442 throws ArtifactDatabaseException |
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443 { |
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444 final String [] factoryName = new String[1]; |
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445 |
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446 byte [] bytes = (byte [])backend.loadArtifact( |
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447 artifact, |
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448 new Backend.ArtifactLoader() { |
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449 public Object load( |
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450 ArtifactFactory factory, |
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451 byte [] bytes, |
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452 int id |
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453 ) { |
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454 factoryName[0] = factory.getName(); |
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455 return bytes; |
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456 } |
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457 }); |
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458 |
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459 if (bytes == null) { |
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460 throw new ArtifactDatabaseException(NO_SUCH_ARTIFACT); |
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461 } |
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462 |
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463 return createExportDocument( |
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464 factoryName[0], |
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465 bytes, |
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466 exportSecret); |
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467 } |
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468 |
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469 protected static Document createExportDocument( |
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470 String factoryName, |
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471 byte [] artifact, |
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472 byte [] secret |
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473 ) { |
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474 Document document = XMLUtils.newDocument(); |
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475 |
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476 MessageDigest md; |
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477 try { |
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478 md = MessageDigest.getInstance(DIGEST_ALGORITHM); |
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479 } |
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480 catch (NoSuchAlgorithmException nsae) { |
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481 logger.error(nsae.getLocalizedMessage(), nsae); |
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482 return document; |
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483 } |
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484 |
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485 md.update(artifact); |
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486 md.update(secret); |
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487 |
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488 String checksum = StringUtils.toHex(md.digest()); |
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489 |
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490 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( |
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491 document, |
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492 ArtifactNamespaceContext.NAMESPACE_URI, |
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493 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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494 |
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495 Element root = ec.create("result"); |
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496 document.appendChild(root); |
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497 |
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498 Element type = ec.create("type"); |
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499 ec.addAttr(type, "name", "export"); |
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500 root.appendChild(type); |
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501 |
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502 Element data = ec.create("data"); |
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503 ec.addAttr(data, "checksum", checksum); |
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504 data.setTextContent(Base64.encodeBase64String(artifact)); |
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505 |
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506 root.appendChild(data); |
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507 |
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508 return document; |
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509 } |
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510 |
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511 public Document importArtifact(Document data, CallMeta callMeta) |
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512 throws ArtifactDatabaseException |
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513 { |
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514 return null; |
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515 } |
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516 |
68
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517 public String [][] serviceNamesAndDescriptions() { |
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518 return serviceNamesAndDescription; |
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519 } |
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520 |
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521 public Document process( |
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522 String serviceName, |
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523 Document input, |
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524 CallMeta callMeta |
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525 ) |
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526 throws ArtifactDatabaseException |
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527 { |
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528 Service service = (Service)name2service.get(serviceName); |
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529 |
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530 if (service == null) { |
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531 throw new ArtifactDatabaseException(NO_SUCH_SERVICE); |
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532 } |
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533 |
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534 return service.process(input, context, callMeta); |
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535 } |
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536 } |
79
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537 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |