/*
* JBoss, Home of Professional Open Source.
* Copyright 2010, 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.web.tomcat.service.session.distributedcache.ispn;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.infinispan.Cache;
import org.infinispan.manager.EmbeddedCacheManager;
import org.infinispan.notifications.cachemanagerlistener.annotation.CacheStopped;
import org.infinispan.notifications.cachemanagerlistener.event.CacheStoppedEvent;
import org.infinispan.remoting.transport.jgroups.JGroupsTransport;
import org.jboss.ha.core.framework.server.CoreGroupCommunicationService;
import org.jboss.ha.framework.server.lock.SharedLocalYieldingClusterLockManager;
import org.jboss.logging.Logger;
import org.jgroups.Channel;
/**
* @author Vladimir Blagojevic
* @author Paul Ferraro
*/
public class DefaultLockManagerSource implements LockManagerSource
{
/** The scope assigned to our group communication service */
public static final Short SCOPE_ID = Short.valueOf((short) 222);
/** The service name of the group communication service */
public static final String SERVICE_NAME = "HTTPSESSIONOWNER";
private static final Logger log = Logger.getLogger(DefaultLockManagerSource.class);
private final Map<String, LockManagerEntry> lockManagers = new HashMap<String, LockManagerEntry>();
/**
* {@inheritDoc}
* @see org.jboss.web.tomcat.service.session.distributedcache.ispn.LockManagerSource#getLockManager(org.infinispan.Cache)
*/
@Override
public SharedLocalYieldingClusterLockManager getLockManager(Cache<?, ?> cache)
{
if (cache.getConfiguration().getCacheMode().isClustered()) return null;
EmbeddedCacheManager container = (EmbeddedCacheManager) cache.getCacheManager();
String clusterName = container.getGlobalConfiguration().getClusterName();
synchronized (this.lockManagers)
{
LockManagerEntry entry = this.lockManagers.get(clusterName);
if (entry == null)
{
entry = new LockManagerEntry(cache);
container.addListener(this);
this.lockManagers.put(clusterName, entry);
}
entry.addCache(cache.getName());
return entry.getLockManager();
}
}
private static class LockManagerEntry
{
private SharedLocalYieldingClusterLockManager lockManager;
private CoreGroupCommunicationService service;
private Set<String> caches = new HashSet<String>();
LockManagerEntry(Cache<?, ?> cache)
{
JGroupsTransport transport = (JGroupsTransport) cache.getAdvancedCache().getRpcManager().getTransport();
Channel channel = transport.getChannel();
this.service = new CoreGroupCommunicationService();
this.service.setChannel(channel);
this.service.setScopeId(SCOPE_ID);
try
{
this.service.start();
}
catch (Exception e)
{
throw new IllegalStateException("Unexpected exception while starting group communication service for " + channel.getClusterName());
}
this.lockManager = new SharedLocalYieldingClusterLockManager(SERVICE_NAME, this.service, this.service);
try
{
this.lockManager.start();
}
catch (Exception e)
{
this.service.stop();
throw new IllegalStateException("Unexpected exception while starting lock manager for " + channel.getClusterName());
}
}
SharedLocalYieldingClusterLockManager getLockManager()
{
return this.lockManager;
}
synchronized void addCache(String cacheName)
{
this.caches.add(cacheName);
}
synchronized boolean removeCache(String cacheName)
{
this.caches.remove(cacheName);
boolean empty = this.caches.isEmpty();
if (empty)
{
try
{
this.lockManager.stop();
}
catch (Exception e)
{
log.warn(e.getMessage(), e);
}
try
{
this.service.stop();
}
catch (Exception e)
{
log.warn(e.getMessage(), e);
}
}
return empty;
}
}
@CacheStopped
public void stopped(CacheStoppedEvent event)
{
String clusterName = event.getCacheManager().getGlobalConfiguration().getClusterName();
synchronized (this.lockManagers)
{
LockManagerEntry entry = this.lockManagers.get(clusterName);
if (entry != null)
{
// Returns true if this was the last cache
if (entry.removeCache(event.getCacheName()))
{
this.lockManagers.remove(clusterName);
}
}
}
}
}