Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/LongtermOfferImpl.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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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 import java.util.logging.Level; |
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5 |
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6 import org.dancres.blitz.arc.CacheBlockDescriptor; |
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7 import org.dancres.blitz.oid.OID; |
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8 |
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9 /** |
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10 */ |
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11 public class LongtermOfferImpl implements LongtermOffer { |
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12 private CacheBlockDescriptor _cbd; |
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13 |
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14 LongtermOfferImpl(CacheBlockDescriptor aDescriptor) { |
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15 _cbd = aDescriptor; |
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16 |
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17 // System.err.println("Locked: " + _cbd + ", " + Thread.currentThread()); |
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18 } |
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19 |
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20 public String getEntryType() { |
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21 return ((EntrySleeveImpl) _cbd.getContent()).getType(); |
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22 } |
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23 |
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24 public boolean offer(SearchVisitor aVisitor) throws IOException { |
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25 long myStartTime = System.currentTimeMillis(); |
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26 |
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27 EntrySleeveImpl mySleeve = |
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28 (EntrySleeveImpl) _cbd.getContent(); |
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29 |
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30 boolean offered = false; |
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31 |
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32 /* |
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33 If the JS specification is changed to cope with the issues |
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34 discussed in http://archives.java.sun.com/cgi-bin/wa?A2=ind0311&L=javaspaces-users&F=&S=&P=4599 and http://archives.java.sun.com/cgi-bin/wa?A2=ind0311&L=javaspaces-users&F=&S=&P=3590 then we need to do two things: |
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35 |
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36 (1) Allow the SearchVisitor to see Sleeve's even if they've |
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37 expired. |
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38 (2) Having "shown" it to the SearchVisitor we'd need to |
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39 query the ReapFilters and if they don't boycott, mark the |
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40 item deleted. |
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41 |
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42 These two steps have the effect of allowing a *ifExists to |
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43 conflict on lease-expired entries that have been locked |
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44 by a transaction and ensures we only delete such entries |
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45 when no transactions have posession of them anymore. Of |
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46 course, this is somewhat slower and less efficient as |
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47 there's never a circumstance under which we can be assured |
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48 that a SearchVisitor *never* sees a particular entry again. |
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49 |
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50 If we must implement the strategy of flunking a transaction |
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51 owing to a lock on a lease expired object, this would be |
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52 best dealt with by having TxnOp's check expiries at prepare |
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53 or commit time. However this is much less appealing as what |
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54 is basically a pessimistic transaction API becomes |
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55 optimistic in this case and only in this case. |
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56 |
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57 All this applies to the similar statement in offer() below. |
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58 */ |
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59 if (!mySleeve.getState().test(SleeveState.DELETED)) { |
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60 |
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61 // If it's expired, mark it deleted, subject to filters |
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62 // |
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63 if (mySleeve.hasExpired(myStartTime)) { |
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64 |
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65 if (!EntryRepositoryFactory.getReaper().filter(mySleeve)) { |
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66 mySleeve.getState().set(SleeveState.DELETED); |
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67 mySleeve.markDirty(); |
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68 |
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69 // Update stats |
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70 // theCounters.didPurge(); |
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71 |
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72 // myLog.incDeletions(); |
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73 } |
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74 } else { |
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75 OpInfo myInfo = |
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76 new FindEntryOpInfo(mySleeve.getType(), |
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77 mySleeve.getOID(), |
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78 aVisitor.isDeleter()); |
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79 |
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80 SearchOffer myOffer = |
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81 new SearchOfferImpl(mySleeve.getEntry(), |
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82 myInfo); |
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83 |
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84 aVisitor.offer(myOffer); |
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85 |
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86 offered = true; |
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87 |
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88 // myLog.incOffers(); |
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89 } |
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90 } |
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91 |
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92 return offered; |
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93 } |
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94 |
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95 public void release() throws IOException { |
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96 // System.err.println("Unlocked: " + _cbd + ", " + Thread.currentThread()); |
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97 _cbd.release(); |
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98 } |
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99 |
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100 public OID getOID() { |
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101 return ((EntrySleeveImpl) _cbd.getContent()).getOID(); |
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102 } |
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103 } |