Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/KeyIndex.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz.entry; |
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2 |
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3 import java.io.IOException; |
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4 import java.io.Serializable; |
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5 import java.io.FileNotFoundException; |
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6 |
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7 import java.util.logging.*; |
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8 import java.util.HashMap; |
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9 |
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10 import com.sleepycat.je.Database; |
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11 import com.sleepycat.je.Cursor; |
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12 import com.sleepycat.je.DatabaseException; |
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13 import com.sleepycat.je.DatabaseEntry; |
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14 import com.sleepycat.je.Transaction; |
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15 import com.sleepycat.je.DatabaseConfig; |
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16 import com.sleepycat.je.LockMode; |
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17 import com.sleepycat.je.OperationStatus; |
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18 import com.sleepycat.je.DeadlockException; |
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19 import com.sleepycat.je.LockNotGrantedException; |
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20 |
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21 import org.dancres.util.BytePacker; |
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22 |
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23 import org.dancres.blitz.mangler.MangledEntry; |
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24 import org.dancres.blitz.mangler.MangledField; |
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25 |
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26 import org.dancres.blitz.disk.DiskTxn; |
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27 import org.dancres.blitz.disk.Disk; |
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28 import org.dancres.blitz.disk.BackoffGenerator; |
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29 |
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30 import org.dancres.blitz.oid.OID; |
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31 import org.dancres.blitz.oid.OIDFactory; |
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32 |
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33 /** |
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34 This class serves as a key generator for a DB secondary index and knows how |
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35 to associate with the main db. <P> |
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36 |
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37 Note that duplicate keys are allowed in these databases because various |
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38 key values can, of course, hash to the same value. |
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39 */ |
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40 class KeyIndex implements Serializable { |
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41 private static Logger theLogger = |
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42 Logger.getLogger("org.dancres.disk.KeyIndex"); |
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43 |
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44 private String theType; |
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45 private String theIndexName; |
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46 private int theOffset; |
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47 |
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48 private transient Database theSecondaryDb; |
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49 |
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50 KeyIndex(String aType, String anIndexName, int anOffset) { |
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51 theType = aType; |
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52 theIndexName = anIndexName; |
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53 theOffset = anOffset; |
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54 } |
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55 |
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56 public String getName() { |
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57 return theIndexName; |
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58 } |
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59 |
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60 void init() throws IOException { |
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61 /* |
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62 Open db and create if necessary, invoke associate |
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63 ignore bucket 0 entities. Implies entry's in |
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64 main DB should store Object so they can store both |
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65 MangledEntry instances and arbitrary data. |
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66 |
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67 Keep a note of Db instance as we'll need it to do close. |
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68 */ |
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69 try { |
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70 DatabaseConfig myConfig = new DatabaseConfig(); |
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71 myConfig.setAllowCreate(true); |
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72 myConfig.setSortedDuplicates(true); |
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73 |
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74 // Allow duplicates |
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75 // |
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76 // theSecondaryDb.set_flags(Db.DB_DUP | Db.DB_REVSPLITOFF); |
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77 |
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78 theSecondaryDb = Disk.newDb(null, theType + "_" + theIndexName, |
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79 myConfig); |
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80 |
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81 } catch (DatabaseException aDbe) { |
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82 theLogger.log(Level.SEVERE, "Got Dbe", aDbe); |
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83 throw new IOException("Dbe"); |
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84 } |
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85 } |
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86 |
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87 void index(OID anId, MangledField[] aFields, DiskTxn aTxn) |
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88 throws DatabaseException { |
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89 |
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90 MangledField myField = aFields[theOffset]; |
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91 |
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92 if (myField.isNull()) |
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93 return; |
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94 |
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95 // Safety check |
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96 if (myField.getName().equals(theIndexName)) { |
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97 byte[] myHash = new byte[4]; |
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98 BytePacker myPacker = BytePacker.getMSBPacker(myHash); |
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99 myPacker.putInt(myField.hashCode(), 0); |
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100 |
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101 byte[] myTarget = OIDFactory.getKey(anId); |
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102 |
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103 theSecondaryDb.put(aTxn.getDbTxn(), |
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104 new DatabaseEntry(myHash), |
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105 new DatabaseEntry(myTarget)); |
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106 } else { |
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107 throw new RuntimeException("Eeek, field we found isn't ours"); |
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108 } |
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109 } |
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110 |
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111 void unIndex(OID anId, MangledField[] aFields) |
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112 throws IOException { |
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113 |
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114 MangledField myField = aFields[theOffset]; |
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115 |
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116 if (myField.isNull()) |
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117 return; |
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118 |
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119 // Pack the hash as key into secondary index |
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120 byte[] myHash = new byte[4]; |
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121 BytePacker myPacker = BytePacker.getMSBPacker(myHash); |
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122 myPacker.putInt(myField.hashCode(), 0); |
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123 DatabaseEntry myHashKey = new DatabaseEntry(myHash); |
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124 |
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125 // We'll need to compare the data of each index entry with the key |
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126 // of our target entry |
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127 byte[] myEntryKey = OIDFactory.getKey(anId); |
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128 DatabaseEntry myKeyValue = new DatabaseEntry(myEntryKey); |
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129 int myRetryCount = 0; |
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130 |
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131 do { |
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132 DiskTxn myTxn = DiskTxn.newNonBlockingStandalone(); |
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133 Cursor myCursor = newCursor(myTxn); |
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134 |
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135 try { |
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136 // Locate all entries under the hashcode value of our field |
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137 OperationStatus myResult = myCursor.getSearchBoth(myHashKey, |
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138 myKeyValue, |
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139 null); // LockMode.RMW); |
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140 |
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141 /* |
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142 If we crashed whilst doing a delete, some indexes may not have |
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143 an entry, that's okay we just note it in the log |
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144 */ |
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145 if ((myResult.equals(OperationStatus.NOTFOUND)) || |
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146 (myResult.equals(OperationStatus.KEYEMPTY))) |
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147 theLogger.log(Level.SEVERE, |
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148 "Warning, didn't find an index entry " + anId + |
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149 ", " + myField.hashCode() + ", " + |
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150 myResult.equals(OperationStatus.NOTFOUND)); |
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151 else { |
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152 myCursor.delete(); |
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153 } |
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154 |
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155 myCursor.close(); |
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156 |
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157 myTxn.commit(); |
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158 |
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159 if (myRetryCount != 0) { |
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160 theLogger.log(Level.FINE, |
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161 "Total retries: " + myRetryCount); |
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162 } |
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163 |
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164 return; |
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165 } catch (DatabaseException aDbe) { |
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166 /* |
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167 Argh, docs say it'll throw Deadlock but code says |
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168 LockNotGranted..... |
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169 */ |
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170 if ((aDbe instanceof DeadlockException) || |
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171 (aDbe instanceof LockNotGrantedException)) { |
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172 |
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173 if (theLogger.isLoggable(Level.FINEST)) |
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174 theLogger.log(Level.FINEST, "Got lock exception", aDbe); |
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175 |
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176 try { |
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177 myCursor.close(); |
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178 } catch (DatabaseException aCDbe) { |
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179 theLogger.log(Level.SEVERE, "Got Dbe", aCDbe); |
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180 throw new IOException("Dbe"); |
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181 } |
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182 myTxn.abort(); |
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183 |
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184 // System.err.println("Aborting index delete, retry: " + |
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185 // myRetryCount); |
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186 |
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187 ++myRetryCount; |
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188 |
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189 BackoffGenerator.pause(); |
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190 |
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191 } else { |
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192 theLogger.log(Level.SEVERE, "Got Dbe", aDbe); |
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193 throw new IOException("Dbe"); |
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194 } |
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195 } |
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196 } while (true); |
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197 } |
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198 |
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199 private boolean compare(byte[] aBytes, byte[] anotherBytes) { |
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200 for (int i = 0; i < aBytes.length; i++) { |
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201 if (aBytes[i] != anotherBytes[i]) |
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202 return false; |
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203 } |
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204 |
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205 return true; |
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206 } |
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207 |
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208 Cursor newCursor() throws IOException { |
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209 try { |
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210 return theSecondaryDb.openCursor(DiskTxn.getActiveDbTxn(), null); |
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211 } catch (DatabaseException aDbe) { |
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212 theLogger.log(Level.SEVERE, "Got Dbe", aDbe); |
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213 throw new IOException("Dbe"); |
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214 } |
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215 } |
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216 |
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217 Cursor newCursor(DiskTxn aTxn) throws IOException { |
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218 try { |
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219 if (aTxn != null) |
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220 return theSecondaryDb.openCursor(aTxn.getDbTxn(), null); |
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221 else |
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222 return theSecondaryDb.openCursor(null, null); |
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223 } catch (DatabaseException aDbe) { |
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224 theLogger.log(Level.SEVERE, "Got Dbe", aDbe); |
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225 throw new IOException("Dbe"); |
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226 } |
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227 } |
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228 |
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229 void close() throws IOException { |
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230 try { |
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231 theSecondaryDb.close(); |
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232 } catch (DatabaseException aDbe) { |
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233 theLogger.log(Level.SEVERE, "Got Dbe", aDbe); |
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234 throw new IOException("Dbe"); |
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235 } |
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236 } |
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237 |
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238 void delete() throws IOException { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
239 Disk.deleteDb(theType + "_" + theIndexName); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
240 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
241 } |