Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/meta/RegistryImpl.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
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rev | line source |
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0
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1 package org.dancres.blitz.meta; |
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2 |
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3 import java.io.Serializable; |
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4 import java.io.IOException; |
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5 import java.io.FileNotFoundException; |
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6 import java.io.File; |
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7 |
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8 import java.util.logging.*; |
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9 |
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10 import com.sleepycat.je.DatabaseException; |
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11 import com.sleepycat.je.Database; |
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12 import com.sleepycat.je.DatabaseEntry; |
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13 import com.sleepycat.je.OperationStatus; |
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14 import com.sleepycat.je.DatabaseConfig; |
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15 |
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16 import org.dancres.blitz.disk.Disk; |
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17 import org.dancres.blitz.disk.DiskTxn; |
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18 import org.dancres.blitz.disk.Syncable; |
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19 |
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20 import org.dancres.blitz.Logging; |
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21 |
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22 import org.dancres.util.ObjectTransformer; |
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23 |
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24 class RegistryImpl implements Registry { |
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25 private Database theDb; |
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26 private String theName; |
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27 |
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28 static Logger theLogger = |
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29 Logging.newLogger("org.dancres.blitz.meta.Registry"); |
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30 |
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31 RegistryImpl(String aName, Initializer anInitializer) throws IOException { |
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32 theName = aName; |
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33 |
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34 try { |
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35 // theDb.set_flags(Db.DB_REVSPLITOFF); |
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36 |
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37 DiskTxn myTxn = DiskTxn.newStandalone(); |
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38 |
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39 DatabaseConfig myConfig = new DatabaseConfig(); |
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40 |
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41 try { |
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42 if (exists(aName)) { |
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43 theDb = Disk.newDb(myTxn.getDbTxn(), getDbNameFor(aName), |
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44 myConfig); |
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45 } else { |
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46 myConfig.setAllowCreate(true); |
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47 theDb = Disk.newDb(myTxn.getDbTxn(), getDbNameFor(aName), |
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48 myConfig); |
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49 |
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50 if (anInitializer != null) |
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51 anInitializer.execute(getAccessor(myTxn)); |
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52 } |
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53 } finally { |
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54 myTxn.commit(true); |
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55 } |
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56 |
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57 } catch (FileNotFoundException aFNFE) { |
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58 theLogger.log(Level.SEVERE, "File not found", aFNFE); |
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59 try { |
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60 theDb.close(); |
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61 } catch (DatabaseException aDbe) { |
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62 // Don't care anymore |
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63 } |
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64 |
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65 throw new IOException("File not found"); |
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66 } catch (DatabaseException aDBE) { |
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67 theLogger.log(Level.SEVERE, "DatabaseException", aDBE); |
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68 try { |
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69 theDb.close(); |
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70 } catch (DatabaseException aDbe) { |
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71 // Don't care anymore |
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72 } |
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73 throw new IOException("DatabaseException"); |
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74 } |
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75 } |
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76 |
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77 public RegistryAccessor getAccessor() throws IOException { |
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78 return new RegistryAccessorImpl(this); |
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79 } |
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80 |
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81 public RegistryAccessor getAccessor(DiskTxn aTxn) throws IOException { |
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82 return new RegistryAccessorImpl(this, aTxn); |
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83 } |
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84 |
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85 Serializable load(DiskTxn aTxn, byte[] aKey) throws IOException { |
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86 DatabaseEntry myKey = new DatabaseEntry(aKey); |
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87 DatabaseEntry myData = new DatabaseEntry(); |
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88 |
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89 try { |
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90 OperationStatus myResult = |
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91 theDb.get(aTxn.getDbTxn(), myKey, myData, null); |
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92 |
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93 if (myResult.equals(OperationStatus.NOTFOUND)) |
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94 return null; |
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95 else { |
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96 try { |
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97 return ObjectTransformer.toObject(myData.getData()); |
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98 } catch (Exception anE) { |
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99 theLogger.log(Level.SEVERE, "Failed to unpack metadata", |
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100 anE); |
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101 throw new IOException("Failed to unpack metadata"); |
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102 } |
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103 } |
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104 } catch (Exception anE) { |
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105 theLogger.log(Level.SEVERE, "Failed to load metadata", |
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106 anE); |
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107 throw new IOException("Failed to load metadata"); |
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108 } |
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109 } |
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110 |
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111 byte[] loadRaw(DiskTxn aTxn, byte[] aKey) throws IOException { |
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112 DatabaseEntry myKey = new DatabaseEntry(aKey); |
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113 DatabaseEntry myData = new DatabaseEntry(); |
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114 |
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115 try { |
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116 OperationStatus myResult = |
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117 theDb.get(aTxn.getDbTxn(), myKey, myData, null); |
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118 |
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119 if (myResult.equals(OperationStatus.NOTFOUND)) |
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120 return null; |
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121 else |
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122 return myData.getData(); |
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123 } catch (DatabaseException aDbe) { |
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124 theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe); |
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125 throw new IOException("Got Dbe"); |
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126 } |
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127 } |
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128 |
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129 void save(DiskTxn aTxn, byte[] aKey, Serializable anObject) |
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130 throws IOException { |
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131 |
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132 DatabaseEntry myKey = new DatabaseEntry(aKey); |
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133 |
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134 byte[] myFlatObject = null; |
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135 |
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136 try { |
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137 myFlatObject = ObjectTransformer.toByte(anObject); |
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138 } catch (Exception anE) { |
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139 theLogger.log(Level.SEVERE, "Failed to pack metadata", |
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140 anE); |
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141 throw new IOException("Failed to pack metadata"); |
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142 } |
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143 |
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144 DatabaseEntry myData = new DatabaseEntry(myFlatObject); |
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145 |
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146 try { |
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147 theDb.put(aTxn.getDbTxn(), myKey, myData); |
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148 } catch (DatabaseException aDbe) { |
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149 theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe); |
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150 throw new IOException("Got Dbe"); |
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151 } |
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152 } |
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153 |
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154 MetaIterator readAll(DiskTxn aTxn) throws IOException { |
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155 return new MetaIteratorImpl(theDb, aTxn); |
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156 } |
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157 |
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158 void delete(DiskTxn aTxn, byte[] aKey) throws IOException { |
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159 |
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160 try { |
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161 theDb.delete(aTxn.getDbTxn(), new DatabaseEntry(aKey)); |
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162 } catch (DatabaseException aDbe) { |
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163 theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe); |
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164 throw new IOException("Got Dbe"); |
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165 } |
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166 } |
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167 |
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168 public void close() throws IOException { |
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169 try { |
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170 theDb.close(); |
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171 } catch (DatabaseException aDbe) { |
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172 theLogger.log(Level.SEVERE, "Got DatabaseException", aDbe); |
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173 throw new IOException("Got Dbe"); |
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174 } |
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175 } |
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176 |
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177 void delete() throws IOException { |
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178 Disk.deleteDb(getDbNameFor(theName)); |
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179 } |
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180 |
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181 static boolean exists(String aName) { |
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182 return Disk.dbExists(getDbNameFor(aName)); |
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183 } |
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184 |
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185 private static String getDbNameFor(String aRegName) { |
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186 return aRegName + "-meta"; |
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187 } |
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188 } |