DefaultMBeanServerInterceptor.java

/* 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.    
 */
package org.apache.felix.mosgi.jmx.agent.mx4j.server.interceptor;

import java.util.List;

import javax.management.Attribute;
import javax.management.AttributeList;
import javax.management.AttributeNotFoundException;
import javax.management.InvalidAttributeValueException;
import javax.management.ListenerNotFoundException;
import javax.management.MBeanException;
import javax.management.MBeanInfo;
import javax.management.MBeanRegistrationException;
import javax.management.NotificationFilter;
import javax.management.NotificationListener;
import javax.management.ReflectionException;

import org.apache.felix.mosgi.jmx.agent.mx4j.log.Log;
import org.apache.felix.mosgi.jmx.agent.mx4j.log.Logger;
import org.apache.felix.mosgi.jmx.agent.mx4j.server.MBeanMetaData;

/**
 * Base class for MBeanServer --> MBean interceptors.
 *
 * @author <a href="mailto:biorn_steedom@users.sourceforge.net">Simone Bordet</a>
 * @version $Revision: 1.2 $
 */
public abstract class DefaultMBeanServerInterceptor implements MBeanServerInterceptor, DefaultMBeanServerInterceptorMBean
{
	private boolean enabled = true;
	private String logCategory;
	private List chain;

	protected DefaultMBeanServerInterceptor()
	{
		// It's amazing how setting up here this string dramatically reduces the times to get the Logger instance
		logCategory = getClass().getName() + "." + getType();
	}

	/**
	 * Returns whether this interceptor is enabled
	 * @see #setEnabled
	 */
	public boolean isEnabled()
	{
		return enabled;
	}

	/**
	 * Enables or disables this interceptor
	 * @see #isEnabled
	 */
	public void setEnabled(boolean enabled)
	{
		this.enabled = enabled;
	}

	/**
	 * Returns the type of this interceptor
	 */
	public abstract String getType();

	protected synchronized MBeanServerInterceptor getNext()
	{
		int index = chain.indexOf(this);
		MBeanServerInterceptor next = (MBeanServerInterceptor)chain.get(index + 1);
		next.setChain(chain);
		return next;
	}

	public synchronized void setChain(List chain)
	{
		this.chain = chain;
	}

	protected Logger getLogger()
	{
		return Log.getLogger(logCategory);
	}

	public void addNotificationListener(MBeanMetaData metadata, NotificationListener listener, NotificationFilter filter, Object handback)
	{
		getNext().addNotificationListener(metadata, listener, filter, handback);
	}

   public void removeNotificationListener(MBeanMetaData metadata, NotificationListener listener) throws ListenerNotFoundException
   {
      getNext().removeNotificationListener(metadata, listener);
   }

	public void removeNotificationListener(MBeanMetaData metadata, NotificationListener listener, NotificationFilter filter, Object handback) throws ListenerNotFoundException
	{
		getNext().removeNotificationListener(metadata, listener, filter, handback);
	}

	public void instantiate(MBeanMetaData metadata, String className, String[] params, Object[] args) throws ReflectionException, MBeanException
	{
		getNext().instantiate(metadata, className, params, args);
	}

	public void registration(MBeanMetaData metadata, int operation) throws MBeanRegistrationException
	{
		getNext().registration(metadata, operation);
	}

	public MBeanInfo getMBeanInfo(MBeanMetaData metadata)
	{
		return getNext().getMBeanInfo(metadata);
	}

	public Object invoke(MBeanMetaData metadata, String method, String[] params, Object[] args) throws MBeanException, ReflectionException
	{
		return getNext().invoke(metadata, method, params, args);
	}

	public AttributeList getAttributes(MBeanMetaData metadata, String[] attributes)
	{
		return getNext().getAttributes(metadata, attributes);
	}

	public AttributeList setAttributes(MBeanMetaData metadata, AttributeList attributes)
	{
		return getNext().setAttributes(metadata, attributes);
	}

	public Object getAttribute(MBeanMetaData metadata, String attribute) throws MBeanException, AttributeNotFoundException, ReflectionException
	{
		return getNext().getAttribute(metadata, attribute);
	}

	public void setAttribute(MBeanMetaData metadata, Attribute attribute) throws MBeanException, AttributeNotFoundException, InvalidAttributeValueException, ReflectionException
	{
		getNext().setAttribute(metadata, attribute);
	}
}