/*
* 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.
* @param scae Information about the new attribute
*/
public void attributeAdded(ServletContextAttributeEvent scae);
/**
* Notification that an existing attribute has been removed from the servlet
* context. Called after the attribute is removed.
* @param scae Information about the removed attribute
*/
public void attributeRemoved(ServletContextAttributeEvent scae);
/**
* Notification that an attribute on the servlet context has been replaced.
* Called after the attribute is replaced.
* @param scae Information about the replaced attribute
*/
public void attributeReplaced(ServletContextAttributeEvent scae);
}