Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/entry/ci/CacheIndexer.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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0
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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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10 |
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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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14 |
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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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29 |
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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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58 |
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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 } |