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annotate src/org/dancres/blitz/entry/ci/CacheIndexer.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.
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1 package org.dancres.blitz.entry.ci;
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2
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3 import java.util.logging.Logger;
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4 import java.util.logging.Level;
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5 import java.util.HashMap;
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6
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7 import net.jini.config.ConfigurationException;
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8
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9 import org.dancres.blitz.entry.TupleLocator;
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11 import org.dancres.blitz.mangler.MangledEntry;
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12
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13 import org.dancres.blitz.oid.OID;
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15 import org.dancres.blitz.cache.Cache;
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16 import org.dancres.blitz.cache.CacheListener;
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17 import org.dancres.blitz.cache.Identifiable;
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18
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19 import org.dancres.blitz.Logging;
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20
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21 import org.dancres.blitz.config.ConfigurationFactory;
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22 import org.dancres.blitz.config.EntryConstraints;
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23 import org.dancres.blitz.config.Fifo;
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24
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25 /**
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26 CacheIndexer is responsible for indexing EntrySleeves held in any
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27 cache capable of support CacheListener instances. It supports searching
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28 as per other forms of storage via a TupleLocator::find mechanism.
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30 @todo Maybe use some other kind of list rather than ArrayList which, for
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31 large sizes, may not be so good.
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32 */
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33 public abstract class CacheIndexer {
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34 static Logger theLogger =
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35 Logging.newLogger("org.dancres.blitz.disk.CacheIndexer");
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36
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37 private static HashMap _indexers = new HashMap();
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38
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39 public static CacheIndexer getIndexer(String aType) {
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40 synchronized(_indexers) {
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41 return (CacheIndexer) _indexers.get(aType);
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42 }
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43 }
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44
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45 public static CacheIndexer newIndexer(String aType,
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46 EntryConstraints aConstraints) {
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47
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48 synchronized(_indexers) {
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49 CacheIndexer myIndexer;
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50
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51 if (aConstraints.get(Fifo.class) != null) {
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52 theLogger.log(Level.INFO, "Using FIFO indexer: " + aType);
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53 myIndexer = new FifoIndexer(aType);
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54 } else {
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55 theLogger.log(Level.INFO, "Using HASHMAP indexer: " + aType);
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56 myIndexer = new HashMapIndexer(aType);
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57 }
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59 _indexers.put(aType, myIndexer);
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60
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61 return myIndexer;
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62 }
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63 }
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64
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65 public abstract TupleLocator find(MangledEntry anEntry);
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66
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67 public abstract void dirtied(Identifiable anIdentifiable);
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68
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69 /**
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70 Indicates an entry was recovered from disk and loaded into the
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71 cache.
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72 */
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73 public abstract void loaded(Identifiable anIdentifiable);
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74
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75 /**
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76 Indicates an entry was removed from the cache having, if necessary,
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77 been saved to disk.
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78 */
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79 public abstract void flushed(Identifiable anIdentifiable);
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80
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81 }