/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, 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.jmx.connector.invoker;
import org.jboss.invocation.MarshalledInvocation;
import org.jboss.mx.interceptor.AbstractInterceptor;
import org.jboss.mx.server.Invocation;
/**
* An interceptor that validates the Serializability of responses,
* using plugable policies.
*
* @author <a href="mailto:dimitris@jboss.org">Dimitris Andreadis</a>
* @author <a href="mailto:fabcipriano@yahoo.com.br">Fabiano C. de Oliveira</a>
* @version $Revision$
*/
public class SerializableInterceptor extends AbstractInterceptor
{
/** The plugable policy to use */
private SerializablePolicy policy = new NoopPolicy();
/**
* Configure a SerializablePolicy class
*/
public void setPolicyClass(String policyClass) throws Exception
{
try
{
// try to load the policy Class
Class clazz = Thread.currentThread().getContextClassLoader().loadClass(policyClass);
policy = (SerializablePolicy)clazz.newInstance();
}
catch (Exception e) // ClassNotFoundException, IllegalAccessException, InstantiationException
{
// policy class not found. Make a second try using
// the 'org.jboss.jmx.connector.invoker.serializablepolicy.' package prefix
// for the "standard" reponse policies provided with jboss.
// If that fails, too, rethrow the original exception.
try
{
policyClass = "org.jboss.jmx.connector.invoker.serializablepolicy." + policyClass;
Class clazz = Thread.currentThread().getContextClassLoader().loadClass(policyClass);
policy = (SerializablePolicy)clazz.newInstance();
}
catch (Exception inner)
{
throw e;
}
}
}
public Object invoke(Invocation invocation) throws Throwable
{
// Invoke the next in the sequence
Object result = invocation.nextInterceptor().invoke(invocation);
// If the invocation was an 'invoke(MarshalledInvocation)'
// filter the result using the plugable policy
if ("invoke".equals(invocation.getName()))
{
Object[] args = invocation.getArgs();
if ((args.length == 1) && (args[0] instanceof MarshalledInvocation))
{
MarshalledInvocation mi = (MarshalledInvocation) args[0];
result = policy.filter(mi, result);
}
}
return result;
}
/**
* A noop serializable policy
*/
public class NoopPolicy implements SerializablePolicy
{
public Object filter(MarshalledInvocation input, Object result) throws Throwable
{
return result;
}
}
}