/*
* 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.invocation.unified.server;
import java.rmi.MarshalledObject;
import java.util.ArrayList;
import java.util.HashMap;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import org.jboss.ha.framework.interfaces.GenericClusteringException;
import org.jboss.ha.framework.interfaces.HARMIResponse;
import org.jboss.ha.framework.interfaces.LoadBalancePolicy;
import org.jboss.ha.framework.server.HATarget;
import org.jboss.invocation.Invocation;
import org.jboss.invocation.Invoker;
import org.jboss.invocation.InvokerHA;
import org.jboss.invocation.unified.interfaces.UnifiedInvokerHAProxy;
import org.jboss.mx.util.JMXExceptionDecoder;
import org.jboss.remoting.InvocationRequest;
import org.jboss.system.Registry;
/**
* Unified invoker implementation for InvokerHA
*
* @author <a href="mailto:tom.elrod@jboss.com">Tom Elrod</a>
* @author <a href="mailto:galder.zamarreno@jboss.com">Galder Zamarreno</a>
*/
public class UnifiedInvokerHA extends UnifiedInvoker implements InvokerHA
{
private HashMap beanMap = new HashMap();
public UnifiedInvokerHA()
{
super();
setSubSystem("invokerha");
}
protected void jmxBind()
{
Registry.bind(getServiceName(), this);
}
public java.io.Serializable getStub()
{
return getInvoker().getLocator();
}
public void registerBean(ObjectName beanName, HATarget target) throws Exception
{
Integer hash = new Integer(beanName.hashCode());
if(beanMap.containsKey(hash))
{
log.debug("Trying to register target " + target + " using an existing hashCode. Already registered: " + hash + "=" + beanMap.get(hash));
throw new IllegalStateException("Trying to register target using an existing hashCode.");
}
beanMap.put(hash, target);
}
public Invoker createProxy(ObjectName beanName, LoadBalancePolicy policy, String proxyFamilyName)
throws Exception
{
Integer hash = new Integer(beanName.hashCode());
HATarget target = (HATarget) beanMap.get(hash);
if(target == null)
{
throw new IllegalStateException("The bean hashCode not found");
}
String familyName = proxyFamilyName;
if(familyName == null)
{
familyName = target.getAssociatedPartition().getPartitionName() + "/" + beanName;
}
return createProxy(getStrictRMIException(),
target.getReplicants(), policy, proxyFamilyName, target.getCurrentViewId());
}
public void unregisterBean(ObjectName beanName) throws Exception
{
Integer hash = new Integer(beanName.hashCode());
beanMap.remove(hash);
}
/**
* Implementation of the server invoker handler interface. Will take the invocation request
* and invoke down the interceptor chain.
*
* @param invocationReq
* @return response of the invocation
* @throws Throwable
*/
public Object invoke(InvocationRequest invocationReq) throws Throwable
{
Invocation invocation = (Invocation) invocationReq.getParameter();
Thread currentThread = Thread.currentThread();
ClassLoader oldCl = currentThread.getContextClassLoader();
ObjectName mbean = null;
try
{
mbean = (ObjectName) Registry.lookup(invocation.getObjectName());
/** Clustering **/
long clientViewId = ((Long) invocation.getValue("CLUSTER_VIEW_ID")).longValue();
HATarget target = (HATarget) beanMap.get(invocation.getObjectName());
if(target == null)
{
// We could throw IllegalStateException but we have a race condition that could occur:
// when we undeploy a bean, the cluster takes some time to converge
// and to recalculate a new viewId and list of replicant for each HATarget.
// Consequently, a client could own an up-to-date list of the replicants
// (before the cluster has converged) and try to perform an invocation
// on this node where the HATarget no more exist, thus receiving a
// wrong exception and no failover is performed with an IllegalStateException
//
throw new GenericClusteringException(GenericClusteringException.COMPLETED_NO,
"target is not/no more registered on this node");
}
if(!target.invocationsAllowed())
{
throw new GenericClusteringException(GenericClusteringException.COMPLETED_NO,
"invocations are currently not allowed on this target");
}
/** End Clustering **/
// The cl on the thread should be set in another interceptor
Object obj = getServer().invoke(mbean,
"invoke",
new Object[]{invocation},
Invocation.INVOKE_SIGNATURE);
/** Clustering **/
HARMIResponse haResponse = new HARMIResponse();
if(clientViewId != target.getCurrentViewId())
{
haResponse.newReplicants = new ArrayList(target.getReplicants());
haResponse.currentViewId = target.getCurrentViewId();
}
haResponse.response = obj;
/** End Clustering **/
return new MarshalledObject(haResponse);
}
catch(Exception e)
{
Throwable th = JMXExceptionDecoder.decode(e);
if(log.isTraceEnabled())
{
log.trace("Failed to invoke on mbean: " + mbean, th);
}
if(th instanceof Exception)
{
e = (Exception) th;
}
throw e;
}
finally
{
currentThread.setContextClassLoader(oldCl);
Thread.interrupted(); // clear interruption because this thread may be pooled.
}
}
@Override
public ObjectName preRegister(MBeanServer server, ObjectName name) throws Exception
{
ObjectName result = super.preRegister(server, name);
log.info("Service name is " + getServiceName());
return result;
}
protected Invoker createProxy(boolean isStrictRMIException,
ArrayList targets, LoadBalancePolicy policy,
String proxyFamilyName, long viewId)
{
return new UnifiedInvokerHAProxy(getInvoker().getLocator(), isStrictRMIException,
targets, policy, proxyFamilyName, viewId);
}
}