Mercurial > hg > blitz_condensed
view src/org/dancres/blitz/entry/ci/CacheIndexer.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 |
children |
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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); }