/*
 * 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 javax.servlet;

import java.util.EventListener;

	/** Implementations of this interface receive notifications of
	** changes to the attribute list on the servlet context of a web application. 
	* To receive notification events, the implementation class
	* must be configured in the deployment descriptor for the web application.
	* @see ServletContextAttributeEvent
	 * @since	v 2.3
	*/

public interface ServletContextAttributeListener extends EventListener {
	/** Notification that a new attribute was added to the servlet context. Called after the attribute is added.*/
public void attributeAdded(ServletContextAttributeEvent scab);
	/** Notification that an existing attribute has been removed from the servlet context. Called after the attribute is removed.*/
public void attributeRemoved(ServletContextAttributeEvent scab);
	/** Notification that an attribute on the servlet context has been replaced. Called after the attribute is replaced. */
public void attributeReplaced(ServletContextAttributeEvent scab);
}