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annotate src/org/dancres/blitz/entry/PrimaryLocatorImpl.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
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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 main index file which contains
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18 oid and entry.
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19 */
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20 class PrimaryLocatorImpl 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 theData;
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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 PrimaryLocatorImpl(Cursor aCursor, MangledEntry aTemplate, int aReadahead) {
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34 theCursor = aCursor;
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35 theTemplate = aTemplate;
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36 theReadahead = aReadahead;
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37 }
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38
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39 /**
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40 Invoke this to load the next matching Tuple.
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41
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42 @return <code>true</code> if there was a tuple, <code>false</code>
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43 otherwise
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44 */
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45 public boolean fetchNext() throws IOException {
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46 /*
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47 The cursor will have been initialised whilst we decided which
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48 field was best to search on which means it will already be pointed
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49 at the first record so we must handle this case specially. Note
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50 that we only get created if the cursor actually contains records so
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51 we don't need to do any testing here.
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52 */
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53 if (isFirst) {
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54 loadNext(false);
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55
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56 isFirst = false;
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57
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58 return true;
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59 } else {
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60 return loadNext(true);
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61 }
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62 }
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63
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64 private boolean loadNext(boolean moveForward) throws IOException {
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65 OperationStatus myResult;
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66
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67 try {
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68 theKey = new DatabaseEntry();
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69 theData = new DatabaseEntry();
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70
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71 if (moveForward)
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72 myResult = theCursor.getNext(theKey, theData, null);
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73 else
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74 myResult = theCursor.getCurrent(theKey, theData, null);
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75
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76 } catch (DatabaseException aDbe) {
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77 EntryStorage.theLogger.log(Level.SEVERE, "Got Dbe", aDbe);
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78 throw new IOException("Dbe");
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79 }
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80
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81 return (! myResult.equals(OperationStatus.NOTFOUND));
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82 }
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83
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84 /**
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85 @return the OID of the tuple just fetched with
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86 <code>fetchNext</code>
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87 */
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88 public OID getOID() {
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89 OID myResult = OIDFactory.newOID(theKey.getData());
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90
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91 return myResult;
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92 }
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93
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94 /**
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95 When you've finished with the TupleLocator instance, call release.
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96 */
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97 public void release() throws IOException {
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98 releaseImpl();
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99
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100 Readahead.get().add(theTemplate, theReadahead);
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101 }
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102
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103 private void releaseImpl() throws IOException {
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104 try {
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105 theCursor.close();
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106 } catch (DatabaseException aDbe) {
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107 EntryStorage.theLogger.log(Level.SEVERE, "Got Dbe", aDbe);
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108 throw new IOException("Dbe");
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109 }
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110 }
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111 }