Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/remote/MatchSetImpl.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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children | d3ec5ebc3dba |
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0
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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 |
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18 public class MatchSetImpl implements MatchSet { |
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19 static final int CHUNK_SIZE = 50; |
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20 |
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21 private Lease theLease; |
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22 private EntryViewUID theViewId; |
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23 private BlitzServer theStub; |
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24 |
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25 private boolean isDone; |
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26 |
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27 private EntryChit[] theCurrentBatch; |
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28 private int theOffset = -1; |
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29 |
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30 private int theChunkSize; |
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31 |
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32 private long theLimit; |
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33 |
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34 MatchSetImpl(BlitzServer aStub, LeaseImpl aLease, long aLimit) { |
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35 this(aStub, aLease, CHUNK_SIZE, aLimit); |
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36 } |
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37 |
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38 MatchSetImpl(BlitzServer aStub, LeaseImpl aLease, long aLimit, |
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39 EntryChit[] anInitialBatch) { |
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40 this(aStub, aLease, CHUNK_SIZE, aLimit, anInitialBatch); |
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41 } |
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42 |
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43 MatchSetImpl(BlitzServer aStub, LeaseImpl aLease, |
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44 int aChunkSize, long aLimit) { |
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45 theStub = aStub; |
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46 theChunkSize = aChunkSize; |
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47 theLimit = aLimit; |
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48 theViewId = (EntryViewUID) aLease.getUID(); |
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49 theLease = aLease; |
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50 } |
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51 |
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52 MatchSetImpl(BlitzServer aStub, LeaseImpl aLease, |
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53 int aChunkSize, long aLimit, EntryChit[] aFirstBatch) { |
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54 theStub = aStub; |
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55 theChunkSize = aChunkSize; |
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56 theLimit = aLimit; |
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57 theViewId = (EntryViewUID) aLease.getUID(); |
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58 theLease = aLease; |
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59 |
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60 // Setup index offset if we got a batch |
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61 if (aFirstBatch != null) { |
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62 theOffset = 0; |
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63 theCurrentBatch = aFirstBatch; |
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64 } |
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65 } |
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66 |
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67 public Lease getLease() { |
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68 return theLease; |
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69 } |
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70 |
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71 public Entry next() throws UnusableEntryException, RemoteException { |
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72 if (amDone()) |
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73 return null; |
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74 |
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75 if ((theOffset == -1) || (theOffset >= theCurrentBatch.length)) { |
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76 // Haven't got a batch yet |
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77 theCurrentBatch = theStub.getNext(theViewId, theChunkSize); |
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78 theOffset = 0; |
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79 } |
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80 |
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81 if (theCurrentBatch == null) { |
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82 isDone = true; |
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83 return null; |
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84 } |
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85 |
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86 --theLimit; |
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87 |
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88 return EntryMangler.getMangler().unMangle(theCurrentBatch[theOffset++].getEntry()); |
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89 } |
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90 |
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91 public Entry getSnapshot() { |
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92 if (amDone()) |
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93 throw new RuntimeException("No entry to snapshot - iteration is over"); |
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94 if (theCurrentBatch == null) |
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95 throw new RuntimeException("Call next first!"); |
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96 |
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97 return theCurrentBatch[theOffset - 1].getEntry(); |
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98 } |
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99 |
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100 private boolean amDone() { |
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101 return ((isDone) || (theLimit == 0)); |
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102 } |
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103 } |