Mercurial > hg > blitz_condensed
view src/org/dancres/blitz/entry/ci/CacheIndexer.java @ 0:3dc0c5604566
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 |
parents | |
children |
line wrap: on
line source
package org.dancres.blitz.entry.ci; import java.util.logging.Logger; import java.util.logging.Level; import java.util.HashMap; import net.jini.config.ConfigurationException; import org.dancres.blitz.entry.TupleLocator; import org.dancres.blitz.mangler.MangledEntry; import org.dancres.blitz.oid.OID; import org.dancres.blitz.cache.Cache; import org.dancres.blitz.cache.CacheListener; import org.dancres.blitz.cache.Identifiable; import org.dancres.blitz.Logging; import org.dancres.blitz.config.ConfigurationFactory; import org.dancres.blitz.config.EntryConstraints; import org.dancres.blitz.config.Fifo; /** CacheIndexer is responsible for indexing EntrySleeves held in any cache capable of support CacheListener instances. It supports searching as per other forms of storage via a TupleLocator::find mechanism. @todo Maybe use some other kind of list rather than ArrayList which, for large sizes, may not be so good. */ public abstract class CacheIndexer { static Logger theLogger = Logging.newLogger("org.dancres.blitz.disk.CacheIndexer"); private static HashMap _indexers = new HashMap(); public static CacheIndexer getIndexer(String aType) { synchronized(_indexers) { return (CacheIndexer) _indexers.get(aType); } } public static CacheIndexer newIndexer(String aType, EntryConstraints aConstraints) { synchronized(_indexers) { CacheIndexer myIndexer; if (aConstraints.get(Fifo.class) != null) { theLogger.log(Level.INFO, "Using FIFO indexer: " + aType); myIndexer = new FifoIndexer(aType); } else { theLogger.log(Level.INFO, "Using HASHMAP indexer: " + aType); myIndexer = new HashMapIndexer(aType); } _indexers.put(aType, myIndexer); return myIndexer; } } public abstract TupleLocator find(MangledEntry anEntry); public abstract void dirtied(Identifiable anIdentifiable); /** Indicates an entry was recovered from disk and loaded into the cache. */ public abstract void loaded(Identifiable anIdentifiable); /** Indicates an entry was removed from the cache having, if necessary, been saved to disk. */ public abstract void flushed(Identifiable anIdentifiable); }