/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ejb.plugins;
import org.jboss.deployment.DeploymentException;
import org.jboss.ha.framework.interfaces.DistributedState;
import org.jboss.metadata.ClusterConfigMetaData;
import org.jboss.system.Registry;
/**
* Cache subclass for entity beans shared accross a cluster with
* distributed cache corruption mechanism.
*
* @author <a href="mailto:sacha.labourey@cogito-info.ch">Sacha Labourey</a>
* @version $Revision: 81001 $
*/
public class ClusterSyncEntityInstanceCache
extends EntityInstanceCache
implements org.jboss.ha.framework.interfaces.DistributedState.DSListenerEx
{
protected DistributedState ds = null;
protected String DS_CATEGORY = null;
public void create() throws Exception
{
super.create ();
// Get a reference to the DS service
ClusterConfigMetaData config = getContainer().getBeanMetaData().getClusterConfigMetaData();
String partitionName = config.getPartitionName();
String name = "jboss:service=DistributedState,partitionName=" + partitionName;
ds = (DistributedState) Registry.lookup (name);
if( ds == null )
throw new DeploymentException("Failed to find DistributedState service: "+name);
}
public void start() throws Exception
{
super.start ();
String ejbName = this.getContainer ().getBeanMetaData ().getEjbName ();
this.DS_CATEGORY = "CMPClusteredInMemoryPersistenceManager-" + ejbName;
this.ds.registerDSListenerEx (this.DS_CATEGORY, this);
}
/* From Service interface*/
public void stop()
{
super.stop ();
this.ds.unregisterDSListenerEx (this.DS_CATEGORY, this);
}
// DSListener implementation -------------------------------------
/**
* Called whenever a key has been removed from a category the called object had
* subscribed in.
* @param category The category under which a key has been removed
* @param key The key that has been removed
* @param previousContent The previous content of the key that has been removed
*/
public void keyHasBeenRemoved (String category, java.io.Serializable key, java.io.Serializable previousContent, boolean locallyModified)
{
if (!locallyModified)
this.cacheMiss ((String)key);
}
/**
* Called whenever a key has been added or modified in the category the called object
* has subscribed in.
* @param category The category of the modified/added entry
* @param key The key that has been added or its value modified
* @param value The new value of the key
*/
public void valueHasChanged (String category, java.io.Serializable key, java.io.Serializable value, boolean locallyModified)
{
if (!locallyModified)
this.cacheMiss ((String)key);
}
public void cacheMiss(String key)
{
// a modification has occured on another node, we clean the cache!
try
{
this.remove(key);
}
catch (Exception e)
{
log.warn("failed to remove key" ,e);
}
}
}