Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/CleanerImpl.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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0
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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 } |