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annotate src/org/dancres/blitz/entry/LongtermOfferImpl.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
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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 }