Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/entry/CleanerImpl.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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3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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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
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5 import org.dancres.blitz.arc.CacheBlockDescriptor;
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6 import org.dancres.blitz.lease.ReapFilter;
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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 Responsible for taking each ID passed, attempting to load the
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11 specified sleeve, checking with ReapFilters and then deleting sleeve
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12 if appropriate. Note, Storage is expected to pass OID's to us
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13 whilst we pass EntrySleeveImpls to our ReapFilter.
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14 */
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15 public class CleanerImpl implements EntryReaper {
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16 private SleeveCache theCache;
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17 private ReapFilter theFilter;
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18
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19 /**
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20 * @param aCache the cache to request sleeves from for OIDs
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21 * passed in by Storage
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22 * @param aFilter the filter to check with before performing deletion.
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23 */
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24 CleanerImpl(SleeveCache aCache, ReapFilter aFilter) {
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25 theCache = aCache;
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26 theFilter = aFilter;
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27 }
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28
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29 public void clean(TupleLocator aLocator) throws IOException {
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30 /**
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31 Accept TupleLocator from Storage
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32 Attempt load to cache
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33 Check with theFilter
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34 Mark deleted (if filter says okay)
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35 Release CBD
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36 */
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37 long myCurrentTime = System.currentTimeMillis();
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38
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39 long myPurged = 0;
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40
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41 while (aLocator.fetchNext()) {
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42 OID myOID = aLocator.getOID();
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43
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44 CacheBlockDescriptor myCBD = theCache.load(myOID);
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45
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46 if (myCBD != null) {
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47 EntrySleeveImpl mySleeve = (EntrySleeveImpl)
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48 myCBD.getContent();
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49
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50 /*
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51 If you expect a particular EntrySleeve to be cleaned
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52 and it's not happening, uncomment these to provide some
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53 hints
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54 System.err.println("Has expired: " +
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55 mySleeve.hasExpired(myCurrentTime));
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56
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57 System.err.println("Has deleted: " +
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58 mySleeve.getState().test(SleeveState.DELETED));
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59
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60 System.err.println("Filtered: " +
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61 theFilter.filter(mySleeve));
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62 */
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63
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64 if ((mySleeve.hasExpired(myCurrentTime)) &&
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65 (! mySleeve.getState().test(SleeveState.DELETED)) &&
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66 (! theFilter.filter(mySleeve))) {
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67
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68 /*
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69 System.err.println("Lease delete:" +
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70 mySleeve.getUid());
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71 */
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72
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73 mySleeve.getState().set(SleeveState.DELETED);
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74 mySleeve.markDirty();
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75 theCache.getCounters().didPurge();
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76
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77 ++myPurged;
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78 }
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79
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80 myCBD.release();
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81 }
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82 }
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83
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84 EntryStorage.theLogger.info("Reaper purged " + theCache +
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85 " " + myPurged);
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86 }
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87 }