/*
* 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.http.server;
import java.util.ArrayList;
import javax.management.JMException;
import javax.management.MBeanServer;
import javax.management.MBeanException;
import javax.management.ObjectName;
import javax.management.ReflectionException;
import javax.management.MBeanInfo;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanConstructorInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanNotificationInfo;
import javax.management.MBeanParameterInfo;
import org.jboss.ha.framework.interfaces.HARMIResponse;
import org.jboss.ha.framework.interfaces.GenericClusteringException;
import org.jboss.ha.framework.server.HATarget;
import org.jboss.invocation.Invocation;
import org.jboss.logging.Logger;
import org.jboss.mx.util.JMXExceptionDecoder;
import org.jboss.mx.util.DynamicMBeanSupport;
/** This is an invoker that delegates to the target invoker and handles the
* wrapping of the response in an HARMIResponse with any updated HATarget info.
* @see HttpProxyFactoryHA
*
* @author <a href="mailto:scott.stark@jboss.org">Scott Stark</a>
* @version $Revision: 105943 $
*/
public class HAInvokerWrapper extends DynamicMBeanSupport
{
private static Logger log = Logger.getLogger(HAInvokerWrapper.class);
private MBeanServer mbeanServer;
private MBeanInfo info;
private ObjectName targetName;
private HATarget target;
public HAInvokerWrapper(MBeanServer mbeanServer, ObjectName targetName, HATarget target)
{
this.mbeanServer = mbeanServer;
this.targetName = targetName;
this.target = target;
MBeanAttributeInfo[] attrInfo = null;
MBeanConstructorInfo[] ctorInfo = null;
MBeanParameterInfo[] sig = {
new MBeanParameterInfo("invocation", Invocation.class.getName(),
"The invocation content information")
};
MBeanOperationInfo[] opInfo = {
new MBeanOperationInfo("invoke", "The detached invoker entry point",
sig, "java.lang.Object", MBeanOperationInfo.ACTION)
};
MBeanNotificationInfo[] eventInfo = null;
this.info = new MBeanInfo(getClass().getName(),
"A wrapper inovker that delegates to the target invoker",
attrInfo,
ctorInfo,
opInfo,
eventInfo);
}
/** The JMX DynamicMBean invoke entry point. This only handles the
* invoke(Invocation) operation.
*
* @param actionName
* @param params
* @param signature
* @return the invocation response
* @throws MBeanException
* @throws ReflectionException
*/
public Object invoke(String actionName, Object[] params, String[] signature)
throws MBeanException, ReflectionException
{
if( params == null || params.length != 1 ||
(params[0] instanceof Invocation) == false )
{
NoSuchMethodException e = new NoSuchMethodException(actionName);
throw new ReflectionException(e, actionName);
}
Invocation invocation = (Invocation) params[0];
try
{
Object value = invoke(invocation);
return value;
}
catch(Exception e)
{
throw new ReflectionException(e, "Invoke failure");
}
}
/** The invoker entry point.
* @param invocation
* @return A HARMIResponse that wraps the result of calling invoke(Invocation)
* on the targetName MBean
* @throws Exception
*/
public Object invoke(Invocation invocation)
throws Exception
{
ClassLoader oldCl = Thread.currentThread().getContextClassLoader();
try
{
// The cl on the thread should be set in another interceptor
Object[] args = {invocation};
String[] sig = {"org.jboss.invocation.Invocation"};
Object rtn = mbeanServer.invoke(targetName, "invoke", args, sig);
// Update the targets list if the client view is out of date
Long clientViewId = (Long) invocation.getValue("CLUSTER_VIEW_ID");
HARMIResponse rsp = new HARMIResponse();
if (clientViewId.longValue() != target.getCurrentViewId())
{
rsp.newReplicants = new ArrayList<Object>(target.getReplicantList());
rsp.currentViewId = target.getCurrentViewId();
}
rsp.response = rtn;
// Return the raw object and let the http layer marshall it
return rsp;
}
catch (Exception e)
{
// Unwrap any JMX exceptions
e = (Exception) JMXExceptionDecoder.decode(e);
// Don't send JMX exception back to client to avoid needing jmx
if( e instanceof JMException )
e = new GenericClusteringException (GenericClusteringException.COMPLETED_NO, e.getMessage());
// Only log errors if trace is enabled
if( log.isTraceEnabled() )
log.trace("operation failed", e);
throw e;
}
finally
{
Thread.currentThread().setContextClassLoader(oldCl);
}
}
public MBeanInfo getMBeanInfo()
{
return info;
}
}