Mercurial > hg > blitz_stable

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

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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
parents
children
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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
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5 import java.util.logging.Level;
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6
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7 import com.sleepycat.je.Cursor;
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8 import com.sleepycat.je.DatabaseEntry;
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9 import com.sleepycat.je.DatabaseException;
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10 import com.sleepycat.je.OperationStatus;
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11
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12 import org.dancres.blitz.oid.OID;
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13 import org.dancres.blitz.oid.OIDFactory;
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14 import org.dancres.blitz.mangler.MangledEntry;
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15
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16 /**
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17 TupleLocator implementation to be used on secondary indexes which consist
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18 of hashcode followed by oid
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19 */
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20 class IndexLocatorImpl implements TupleLocator {
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21 private MangledEntry theTemplate;
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22 private int theReadahead;
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23
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24 private Cursor theCursor;
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25 private boolean isFirst = true;
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26
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27 private DatabaseEntry theKey;
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28 private DatabaseEntry theHashCode;
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29
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30 /**
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31 @param aCursor the cursor to use for iteration
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32 */
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33 IndexLocatorImpl(Cursor aCursor, DatabaseEntry aHashCode,
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34 MangledEntry aTemplate, int aReadahead) {
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35 theCursor = aCursor;
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36 theHashCode = aHashCode;
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37 theTemplate = aTemplate;
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38 theReadahead = aReadahead;
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39 }
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40
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41 /**
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42 Invoke this to load the next matching Tuple.
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43
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44 @return <code>true</code> if there was a tuple, <code>false</code>
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45 otherwise
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46 */
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47 public boolean fetchNext() throws IOException {
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48 /*
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49 The cursor will have been initialised whilst we decided which
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50 field was best to search on which means it will already be pointed
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51 at the first record so we must handle this case specially. Note
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52 that we only get created if the cursor actually contains records so
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53 we don't need to do any testing here.
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54 */
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55 if (isFirst) {
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56 loadNext();
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57
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58 isFirst = false;
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59
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60 return true;
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61 } else {
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62 return loadNextMove();
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63 }
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64 }
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65
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66 private boolean loadNextMove() throws IOException {
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67 return loadNext(true);
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68 }
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69
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70 private boolean loadNext() throws IOException {
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71 return loadNext(false);
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72 }
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73
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74 private boolean loadNext(boolean advance) throws IOException {
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75 OperationStatus myResult;
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76
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77 try {
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78 theKey = new DatabaseEntry();
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79
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80 if (advance)
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81 myResult = theCursor.getNextDup(theHashCode, theKey, null);
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82 else
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83 myResult = theCursor.getCurrent(theHashCode, theKey, null);
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84 } catch (DatabaseException aDbe) {
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85 EntryStorage.theLogger.log(Level.SEVERE, "Got Dbe", aDbe);
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86 throw new IOException("Dbe");
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87 }
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88
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89 // BytePacker myPacker = BytePacker.getMSBPacker(theHashCode.getData());
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90
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91 // System.out.println("Loop: " + this + ", " + myPacker.getInt(0));
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92
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93
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94 return (! myResult.equals(OperationStatus.NOTFOUND));
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95 }
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96
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97 /**
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98 @return the OID of the tuple just fetched with
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99 <code>fetchNext</code>
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100 */
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101 public OID getOID() {
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102 OID myResult = OIDFactory.newOID(theKey.getData());
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103
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104 return myResult;
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105 }
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106
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107 /**
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108 When you've finished with the TupleLocator instance, call release.
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109 */
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110
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111 public void release() throws IOException {
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112 releaseImpl();
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113
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114 Readahead.get().add(theTemplate, theReadahead);
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115 }
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116
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117 public void releaseImpl() throws IOException {
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118 try {
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119 theCursor.close();
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120 } catch (DatabaseException aDbe) {
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121 EntryStorage.theLogger.log(Level.SEVERE, "Got Dbe", aDbe);
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122 throw new IOException("Dbe");
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123 }
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124 }
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125 }