annotate src/org/dancres/blitz/entry/KeyIndex.java @ 0:3dc0c5604566

Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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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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Dan Creswell <dan.creswell@gmail.com>
parents:
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134
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
135 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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136 // Locate all entries under the hashcode value of our field
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
137 OperationStatus myResult = myCursor.getSearchBoth(myHashKey,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
138 myKeyValue,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
139 null); // LockMode.RMW);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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140
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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141 /*
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Dan Creswell <dan.creswell@gmail.com>
parents:
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142 If we crashed whilst doing a delete, some indexes may not have
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
143 an entry, that's okay we just note it in the log
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Dan Creswell <dan.creswell@gmail.com>
parents:
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144 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
145 if ((myResult.equals(OperationStatus.NOTFOUND)) ||
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
146 (myResult.equals(OperationStatus.KEYEMPTY)))
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
147 theLogger.log(Level.SEVERE,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
148 "Warning, didn't find an index entry " + anId +
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
149 ", " + myField.hashCode() + ", " +
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
150 myResult.equals(OperationStatus.NOTFOUND));
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
151 else {
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
152 myCursor.delete();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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153 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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154
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
155 myCursor.close();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
156
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
157 myTxn.commit();
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Dan Creswell <dan.creswell@gmail.com>
parents:
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158
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
159 if (myRetryCount != 0) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
160 theLogger.log(Level.FINE,
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
161 "Total retries: " + myRetryCount);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
162 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
163
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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164 return;
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Dan Creswell <dan.creswell@gmail.com>
parents:
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165 } catch (DatabaseException aDbe) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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166 /*
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
167 Argh, docs say it'll throw Deadlock but code says
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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168 LockNotGranted.....
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Dan Creswell <dan.creswell@gmail.com>
parents:
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169 */
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
170 if ((aDbe instanceof DeadlockException) ||
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
171 (aDbe instanceof LockNotGrantedException)) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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172
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
173 if (theLogger.isLoggable(Level.FINEST))
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
174 theLogger.log(Level.FINEST, "Got lock exception", aDbe);
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Dan Creswell <dan.creswell@gmail.com>
parents:
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175
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
176 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
177 myCursor.close();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
178 } catch (DatabaseException aCDbe) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
179 theLogger.log(Level.SEVERE, "Got Dbe", aCDbe);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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180 throw new IOException("Dbe");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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181 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
182 myTxn.abort();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
183
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
184 // System.err.println("Aborting index delete, retry: " +
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
185 // myRetryCount);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
186
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
187 ++myRetryCount;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
188
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
189 BackoffGenerator.pause();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
190
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
191 } else {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
192 theLogger.log(Level.SEVERE, "Got Dbe", aDbe);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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193 throw new IOException("Dbe");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
194 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
195 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
196 } while (true);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
197 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
198
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
199 private boolean compare(byte[] aBytes, byte[] anotherBytes) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff changeset
200 for (int i = 0; i < aBytes.length; i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
201 if (aBytes[i] != anotherBytes[i])
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
202 return false;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
203 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
204
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
205 return true;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
206 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
207
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
208 Cursor newCursor() throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
209 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
210 return theSecondaryDb.openCursor(DiskTxn.getActiveDbTxn(), null);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
211 } catch (DatabaseException aDbe) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
212 theLogger.log(Level.SEVERE, "Got Dbe", aDbe);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
213 throw new IOException("Dbe");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
214 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
215 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
216
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
217 Cursor newCursor(DiskTxn aTxn) throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
218 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
219 if (aTxn != null)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
220 return theSecondaryDb.openCursor(aTxn.getDbTxn(), null);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
221 else
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
222 return theSecondaryDb.openCursor(null, null);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
223 } catch (DatabaseException aDbe) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
224 theLogger.log(Level.SEVERE, "Got Dbe", aDbe);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
225 throw new IOException("Dbe");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
226 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
227 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
228
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
229 void close() throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
230 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
231 theSecondaryDb.close();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
232 } catch (DatabaseException aDbe) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
233 theLogger.log(Level.SEVERE, "Got Dbe", aDbe);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
234 throw new IOException("Dbe");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
235 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
236 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
237
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
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 }