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annotate src/org/dancres/blitz/ExistsFactory.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;
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2
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3 import java.lang.ref.WeakReference;
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4 import java.io.IOException;
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5
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6 import org.dancres.blitz.txnlock.BaulkedParty;
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7 import org.dancres.blitz.entry.SearchVisitor;
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8 import org.dancres.blitz.entry.EntryRepository;
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9 import org.dancres.blitz.entry.EntryRepositoryFactory;
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10 import org.dancres.blitz.mangler.MangledEntry;
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11
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12 /**
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13 * Use this class for *Exists searches return single results, bulk operations
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14 * are <b>not</b> currently supported.
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15 *
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16 * This class maintains a count of transaction conflicts that have occurred
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17 * and when it reaches zero, signals the associated <code>MatchTask</code> via
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18 * it's <code>SearchVisitor</code>. Note the signal is only permitted after
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19 * <code>enableResolutionSignal</code> has been called. This provides a
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20 * barrier such that a full disk-search can be completed without false
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21 * terminations from resulting conflicts.
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22 */
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23 public class ExistsFactory implements VisitorBaulkedPartyFactory {
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24 private int _conflicts;
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25 private boolean _resolvable = false;
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26 private WeakReference _task;
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27
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28 public BaulkedParty newParty(SingleMatchTask aMatchTask) {
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29 _task = new WeakReference(aMatchTask);
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30 return new BaulkedPartyImpl();
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31 }
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32
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33 public BaulkedParty newParty(BulkTakeVisitor aMatchTask) {
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34 throw new RuntimeException
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35 ("Exists not currently supported on bulk operations");
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36 }
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37
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38 public void enableResolutionSignal() {
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39 synchronized (this) {
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40 _resolvable = true;
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41 }
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42
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43 testAndSignal();
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44 }
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45
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46 private SearchVisitor getVisitor() {
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47 MatchTask myTask = (MatchTask) _task.get();
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48
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49 if (myTask == null)
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50 return null;
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51 else
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52 return myTask.getVisitor();
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53 }
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54
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55 private void testAndSignal() {
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56 int myConflicts;
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57
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58 synchronized(this) {
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59 if (!_resolvable)
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60 return;
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61
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62 myConflicts = _conflicts;
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63 }
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64
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65 if (myConflicts == 0) {
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66 SingleMatchTask myTask = (SingleMatchTask) _task.get();
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67
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68 if (myTask != null) {
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69 myTask.sendEvent(CompletionEvent.COMPLETED);
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70 }
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71 }
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72 }
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73
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74 private class BaulkedPartyImpl implements BaulkedParty {
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75
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76 public BaulkedPartyImpl() {
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77 }
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78
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79 public void blocked(Object aHandback) {
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80 synchronized(ExistsFactory.this) {
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81 ++_conflicts;
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82 }
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83 }
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84
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85 public void unblocked(Object aHandback) {
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86 Handback myHandback = (Handback) aHandback;
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87
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88 try {
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89 SearchVisitor myVisitor = getVisitor();
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90
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91 if (myVisitor == null)
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92 return;
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93
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94 EntryRepository myRepos =
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95 EntryRepositoryFactory.get().get(myHandback.getType());
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96
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97 myRepos.find(myVisitor, myHandback.getOID(),
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98 myHandback.getEntry());
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99
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100 } catch (IOException aDbe) {
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101 } finally {
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102 synchronized(ExistsFactory.this) {
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103 --_conflicts;
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104 }
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105
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106 testAndSignal();
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107 }
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108 }
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109 }
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110 }