/*
* 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.proxy.ejb;
import java.util.List;
import javax.management.ObjectName;
import javax.naming.InitialContext;
import org.jboss.system.Registry;
import org.jboss.logging.Logger;
import org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxyHA;
import org.jboss.ha.framework.interfaces.LoadBalancePolicy;
import org.jboss.ha.framework.interfaces.DistributedReplicantManager;
import org.jboss.ha.framework.interfaces.HAPartition;
import org.jboss.ha.framework.server.HAPartitionLocator;
import org.jboss.ha.framework.server.HATarget;
import javax.management.AttributeChangeNotificationFilter;
import javax.management.NotificationListener;
import javax.management.AttributeChangeNotification;
import javax.management.Notification;
import org.jboss.invocation.InvokerProxyHA;
import org.jboss.invocation.InvokerHA;
import org.jboss.system.ServiceMBean;
import org.jboss.naming.Util;
/**
* ProxyFactory for Clustering
*
* @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
* @version $Revision: 81001 $
*
* <p><b>Revisions:</b><br>
* <p><b>2002/01/13: billb</b>
* <ol>
* <li>Initial Revisition
* </ol>
* <p><b>2002/08/24: Sacha Labourey</b>
* <ol>
* <li>Added a "Proxy Family" string that identifies, for a same HATarget,
different families of proxies (remote, home, etc.) that may each
have its own client behaviour (round robin, etc.) => each needs its own
id in the Proxy Family Repository on the client side</li>
* </ol>
*/
public class ProxyFactoryHA
extends ProxyFactory
implements DistributedReplicantManager.ReplicantListener, ClusterProxyFactory
{
protected static Logger log = Logger.getLogger(ProxyFactory.class);
protected String replicantName = null;
protected InvokerHA jrmp;
protected HATarget target;
/**
* Track whether we're in a start()/stop()/start() cycle not driven
* by our EjbModule, in which case we will not get a JMX start
* notification from EjbModule
*/
private boolean containerRestart = true;
/** Are we in the middle of an EjbModule stop and thus not a containerRestart?*/
private boolean ejbModuleStopping = false;
protected DistributedReplicantManager drm = null;
public void create () throws Exception
{
super.create ();
// we register our inner-class to retrieve STATE notifications from our container
//
AttributeChangeNotificationFilter filter = new AttributeChangeNotificationFilter ();
filter.enableAttribute ("State");
// ************************************************************************
// NOTE: We could also subscribe for the container service events instead of the
// ejbModule service events. This problem comes from beans using other beans
// in the same ejbModule: we may receive an IllegalStateException thrown
// by the Container implementation. Using ejbModule events solve this
// problem.
// ************************************************************************
this.container.getServer ().
addNotificationListener (this.container.getEjbModule ().getServiceName (),
new ProxyFactoryHA.StateChangeListener (),
filter,
null);
}
public void start () throws Exception
{
super.start ();
if (containerRestart)
{
containerIsFullyStarted();
containerRestart = false;
}
}
protected void setupInvokers() throws Exception
{
String partitionName = container.getBeanMetaData().getClusterConfigMetaData().getPartitionName();
HAPartition partition = HAPartitionLocator.getHAPartitionLocator().getHAPartition(partitionName, null);
this.drm = partition.getDistributedReplicantManager ();
replicantName = jmxName.toString ();
ObjectName oname = new ObjectName(invokerMetaData.getInvokerMBean());
jrmp = (InvokerHA)Registry.lookup(oname);
if (jrmp == null)
throw new RuntimeException("home JRMPInvokerHA is null: " + oname);
target = new HATarget(partition, replicantName, jrmp.getStub (), HATarget.MAKE_INVOCATIONS_WAIT);
jrmp.registerBean(jmxName, target);
String clusterFamilyName = partitionName + "/" + jmxName + "/";
// make ABSOLUTLY sure we do register with the DRM AFTER the HATarget
// otherwise we will refresh the *old* home in JNDI (ie before the proxy
// is re-generated)
//
drm.registerListener (replicantName, this);
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Class clazz;
LoadBalancePolicy policy;
clazz = cl.loadClass(container.getBeanMetaData().getClusterConfigMetaData().getHomeLoadBalancePolicy());
policy = (LoadBalancePolicy)clazz.newInstance();
homeInvoker = jrmp.createProxy(jmxName, policy, clusterFamilyName + "H");
// (Re-)Bind the home invoker in the JNDI naming space
InitialContext ctx = new InitialContext();
String homeName = jndiBinding + "-HomeInvoker";
log.debug("(re-)Binding Home invoker under: " + homeName);
Util.rebind(ctx,
// Jndi name
homeName,
// The home invoker
homeInvoker
);
clazz = cl.loadClass(container.getBeanMetaData().getClusterConfigMetaData().getBeanLoadBalancePolicy());
policy = (LoadBalancePolicy)clazz.newInstance();
beanInvoker = jrmp.createProxy(jmxName, policy, clusterFamilyName + "R");
// (Re-)Bind the remote invoker in the JNDI naming space
String beanName = jndiBinding + "-RemoteInvoker";
log.debug("(re-)Binding Remote invoker under: " + beanName);
Util.rebind(ctx,
// Jndi name
beanName,
// The bean invoker
beanInvoker
);
JRMPInvokerProxyHA.colocation.add(new Integer(jmxNameHash));
}
@Override
public void stop()
{
super.stop();
teardownInvokers();
if (!ejbModuleStopping)
containerRestart = true;
else
ejbModuleStopping = false;
}
@Override
public void destroy()
{
super.destroy();
containerRestart = false;
ejbModuleStopping = false;
}
private void teardownInvokers()
{
try
{
JRMPInvokerProxyHA.colocation.remove(new Integer(jmxNameHash));
jrmp.unregisterBean(jmxName);
target.destroy();
}
catch (Exception ignored)
{
// ignore.
}
try
{
InitialContext ctx = new InitialContext();
String homeInvokerName = jndiBinding + "-HomeInvoker";
ctx.unbind(homeInvokerName);
}
catch(Exception ignored)
{
}
try
{
InitialContext ctx = new InitialContext();
String beanInvokerName = jndiBinding + "-RemoteInvoker";
ctx.unbind(beanInvokerName);
}
catch(Exception ignored)
{
}
if( drm != null )
drm.unregisterListener (replicantName, this);
}
protected void containerIsFullyStarted ()
{
if( target != null )
target.setInvocationsAuthorization (HATarget.ENABLE_INVOCATIONS);
}
protected void containerIsAboutToStop ()
{
if( target != null )
{
target.setInvocationsAuthorization (HATarget.DISABLE_INVOCATIONS);
target.disable ();
}
this.ejbModuleStopping = true;
}
// synchronized keyword added when it became possible for DRM to issue
// concurrent replicantsChanged notifications. JBAS-2169.
public synchronized void replicantsChanged (String key,
List newReplicants,
int newReplicantsViewId,
boolean merge)
{
try
{
if (homeInvoker instanceof InvokerProxyHA)
{
((InvokerProxyHA)homeInvoker).updateClusterInfo (target.getReplicants(), target.getCurrentViewId ());
}
if (beanInvoker instanceof InvokerProxyHA)
{
((InvokerProxyHA)beanInvoker).updateClusterInfo (target.getReplicants(), target.getCurrentViewId ());
}
log.debug ("Rebinding in JNDI... " + key);
rebindHomeProxy ();
}
catch (Exception none)
{
log.debug (none);
}
}
// inner-classes
class StateChangeListener implements NotificationListener
{
public void handleNotification (Notification notification, java.lang.Object handback)
{
if (notification instanceof AttributeChangeNotification)
{
AttributeChangeNotification notif = (AttributeChangeNotification) notification;
int value = ((Integer)notif.getNewValue()).intValue ();
if (value == ServiceMBean.STARTED)
{
log.debug ("Container fully started: enabling HA-RMI access to bean");
containerIsFullyStarted ();
}
else if (value == ServiceMBean.STOPPING)
{
log.debug ("Container about to stop: disabling HA-RMI access to bean");
containerIsAboutToStop ();
}
}
}
}
}