Mercurial > hg > blitz_condensed
diff 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> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/org/dancres/blitz/entry/ci/CacheIndexer.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,81 @@ +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); + +}