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annotate src/org/dancres/blitz/remote/MatchSetImpl.java @ 3:d3ec5ebc3dba

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Fix up a small race-condition and and a todo for thread-safety in MatchSetImpl.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 25 Apr 2009 08:38:27 +0100
parents 3dc0c5604566
children
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1 package org.dancres.blitz.remote;
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2
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3 import java.rmi.RemoteException;
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4
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5 import net.jini.core.entry.Entry;
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6 import net.jini.core.entry.UnusableEntryException;
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7
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8 import net.jini.core.lease.Lease;
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9
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10 import net.jini.space.MatchSet;
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11
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12 import org.dancres.blitz.EntryChit;
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13
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14 import org.dancres.blitz.mangler.EntryMangler;
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15
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16 import org.dancres.blitz.remote.view.EntryViewUID;
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17
3
d3ec5ebc3dba Fix up a small race-condition and and a todo for thread-safety in MatchSetImpl.
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18 /**
d3ec5ebc3dba Fix up a small race-condition and and a todo for thread-safety in MatchSetImpl.
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19 * @todo Consider making this thread safe, even though multi-threading against a MatchSet makes little sense in most cases
d3ec5ebc3dba Fix up a small race-condition and and a todo for thread-safety in MatchSetImpl.
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20 * (like multi-thread JS transactions).
d3ec5ebc3dba Fix up a small race-condition and and a todo for thread-safety in MatchSetImpl.
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21 *
d3ec5ebc3dba Fix up a small race-condition and and a todo for thread-safety in MatchSetImpl.
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22 * @author dan
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23 */
0
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24 public class MatchSetImpl implements MatchSet {
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25 static final int CHUNK_SIZE = 50;
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26
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27 private Lease theLease;
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28 private EntryViewUID theViewId;
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29 private BlitzServer theStub;
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30
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31 private boolean isDone;
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32
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33 private EntryChit[] theCurrentBatch;
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34 private int theOffset = -1;
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35
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36 private int theChunkSize;
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37
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38 private long theLimit;
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39
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40 MatchSetImpl(BlitzServer aStub, LeaseImpl aLease, long aLimit) {
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41 this(aStub, aLease, CHUNK_SIZE, aLimit);
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42 }
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43
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44 MatchSetImpl(BlitzServer aStub, LeaseImpl aLease, long aLimit,
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45 EntryChit[] anInitialBatch) {
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46 this(aStub, aLease, CHUNK_SIZE, aLimit, anInitialBatch);
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47 }
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48
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49 MatchSetImpl(BlitzServer aStub, LeaseImpl aLease,
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50 int aChunkSize, long aLimit) {
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51 theStub = aStub;
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52 theChunkSize = aChunkSize;
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53 theLimit = aLimit;
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54 theViewId = (EntryViewUID) aLease.getUID();
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55 theLease = aLease;
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56 }
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57
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58 MatchSetImpl(BlitzServer aStub, LeaseImpl aLease,
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59 int aChunkSize, long aLimit, EntryChit[] aFirstBatch) {
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60 theStub = aStub;
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61 theChunkSize = aChunkSize;
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62 theLimit = aLimit;
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63 theViewId = (EntryViewUID) aLease.getUID();
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64 theLease = aLease;
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65
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66 // Setup index offset if we got a batch
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67 if (aFirstBatch != null) {
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68 theOffset = 0;
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69 theCurrentBatch = aFirstBatch;
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70 }
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71 }
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72
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73 public Lease getLease() {
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74 return theLease;
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75 }
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76
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77 public Entry next() throws UnusableEntryException, RemoteException {
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78 if (amDone())
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79 return null;
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80
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81 if ((theOffset == -1) || (theOffset >= theCurrentBatch.length)) {
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82 // Haven't got a batch yet
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83 theCurrentBatch = theStub.getNext(theViewId, theChunkSize);
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84 theOffset = 0;
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85 }
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86
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87 if (theCurrentBatch == null) {
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88 isDone = true;
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89 return null;
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90 }
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91
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92 --theLimit;
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93
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94 return EntryMangler.getMangler().unMangle(theCurrentBatch[theOffset++].getEntry());
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95 }
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96
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97 public Entry getSnapshot() {
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98 if (amDone())
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99 throw new RuntimeException("No entry to snapshot - iteration is over");
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100 if (theCurrentBatch == null)
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101 throw new RuntimeException("Call next first!");
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102
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103 return theCurrentBatch[theOffset - 1].getEntry();
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104 }
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105
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106 private boolean amDone() {
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107 return ((isDone) || (theLimit == 0));
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108 }
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109 }