/*
* 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.HashSet;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;
import org.infinispan.Cache;
import org.infinispan.manager.CacheContainer;
import org.infinispan.manager.EmbeddedCacheManager;
import org.infinispan.notifications.Listener;
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
*/
@Listener
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";
static final Logger log = Logger.getLogger(DefaultLockManagerSource.class);
// Store LockManagers in static map so they can be shared across DCMs
private static final Map<CacheContainer, LockManagerEntry> lockManagers = new IdentityHashMap<CacheContainer, 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;
CacheContainer container = cache.getCacheManager();
synchronized (lockManagers)
{
LockManagerEntry entry = lockManagers.get(container);
if (entry == null)
{
JGroupsTransport transport = (JGroupsTransport) cache.getAdvancedCache().getRpcManager().getTransport();
entry = new LockManagerEntry(transport.getChannel());
trace("Started lock manager for cluster %s", entry);
((EmbeddedCacheManager) container).addListener(this);
lockManagers.put(container, entry);
}
trace("Registering %s with lock manager for cluster %s", cache, entry);
entry.addCache(cache.getName());
return entry.getLockManager();
}
}
private static class LockManagerEntry
{
private final SharedLocalYieldingClusterLockManager lockManager;
private final CoreGroupCommunicationService service;
private final String channelName;
private final Set<String> caches = new HashSet<String>();
LockManagerEntry(Channel channel)
{
this.channelName = channel.getName();
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;
}
/**
* {@inheritDoc}
* @see java.lang.Object#toString()
*/
@Override
public String toString()
{
return this.channelName;
}
}
@CacheStopped
public void stopped(CacheStoppedEvent event)
{
CacheContainer container = event.getCacheManager();
synchronized (lockManagers)
{
LockManagerEntry entry = lockManagers.get(container);
if (entry != null)
{
String cacheName = event.getCacheName();
trace("Deregistering %s from lock manager for cluster %s", cacheName, entry);
// Returns true if this was the last cache
if (entry.removeCache(cacheName))
{
trace("Stopped lock manager for cluster %s", entry);
lockManagers.remove(container);
}
}
}
}
private static void trace(String message, Object... args)
{
if (log.isTraceEnabled())
{
log.trace(String.format(message, args));
}
}
}