package org.apache.stratum.jcs.auxiliary.disk.hsql;
/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Velocity", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import java.util.Enumeration;
import java.util.Hashtable;
import org.apache.stratum.jcs.auxiliary.disk.hsql.behavior.IHSQLCacheAttributes;
import org.apache.stratum.jcs.engine.behavior.ICache;
import org.apache.stratum.jcs.engine.behavior.ICacheManager;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Description of the Class
*
* @author asmuts
* @created January 15, 2002
*/
public class HSQLCacheManager implements ICacheManager
{
private final static Log log =
LogFactory.getLog( HSQLCacheManager.class );
private static int clients;
private static Hashtable caches = new Hashtable();
private static HSQLCacheManager instance;
private static IHSQLCacheAttributes defaultCattr;
/**
* Constructor for the HSQLCacheManager object
*
* @param cattr
*/
private HSQLCacheManager( IHSQLCacheAttributes cattr )
{
this.defaultCattr = cattr;
}
/**
* Gets the defaultCattr attribute of the HSQLCacheManager object
*
* @return The defaultCattr value
*/
public IHSQLCacheAttributes getDefaultCattr()
{
return this.defaultCattr;
}
/**
* Gets the instance attribute of the HSQLCacheManager class
*
* @return The instance value
*/
public static HSQLCacheManager getInstance( IHSQLCacheAttributes cattr )
{
if ( instance == null )
{
synchronized ( HSQLCacheManager.class )
{
if ( instance == null )
{
instance = new HSQLCacheManager( cattr );
}
}
}
if ( log.isDebugEnabled() )
{
log.debug( "Manager stats : " + instance.getStats() + " -- in getInstance()" );
}
clients++;
return instance;
}
/**
* Gets the cache attribute of the HSQLCacheManager object
*
* @return The cache value
*/
public ICache getCache( String cacheName )
{
IHSQLCacheAttributes cattr = ( IHSQLCacheAttributes ) defaultCattr.copy();
cattr.setCacheName( cacheName );
return getCache( cattr );
}
/**
* Gets the cache attribute of the HSQLCacheManager object
*
* @return The cache value
*/
public ICache getCache( IHSQLCacheAttributes cattr )
{
ICache raf = null;
log.debug( "cacheName = " + cattr.getCacheName() );
synchronized ( caches )
{
raf = ( ICache ) caches.get( cattr.getCacheName() );
if ( raf == null )
{
// make use cattr
//raf = new HSQLCache( cattr.getCacheName(), cattr.getDiskPath() );
raf = new HSQLCacheNoWaitBuffer( cattr );
caches.put( cattr.getCacheName(), raf );
}
}
if ( log.isDebugEnabled() )
{
log.debug( "Manager stats : " + instance.getStats() );
}
return raf;
}
/** Description of the Method */
public void freeCache( String name )
{
HSQLCache raf = ( HSQLCache ) caches.get( name );
if ( raf != null )
{
raf.dispose();
}
}
// Don't care if there is a concurrency failure ?
/**
* Gets the stats attribute of the HSQLCacheManager object
*
* @return The stats value
*/
public String getStats()
{
StringBuffer stats = new StringBuffer();
Enumeration allCaches = caches.elements();
while ( allCaches.hasMoreElements() )
{
ICache raf = ( ICache ) allCaches.nextElement();
if ( raf != null )
{
stats.append( raf.getStats() );
stats.append( ", " );
}
}
return stats.toString();
}
/**
* Gets the cacheType attribute of the HSQLCacheManager object
*
* @return The cacheType value
*/
public int getCacheType()
{
return DISK_CACHE;
}
/** Description of the Method */
public void release()
{
// Wait until called by the last client
if ( --clients != 0 )
{
return;
}
synchronized ( caches )
{
Enumeration allCaches = caches.elements();
while ( allCaches.hasMoreElements() )
{
HSQLCache raf = ( HSQLCache ) allCaches.nextElement();
if ( raf != null )
{
raf.dispose();
}
}
}
}
}