1   /*
    2   * Licensed to the Apache Software Foundation (ASF) under one or more
    3   * contributor license agreements.  See the NOTICE file distributed with
    4   * this work for additional information regarding copyright ownership.
    5   * The ASF licenses this file to You under the Apache License, Version 2.0
    6   * (the "License"); you may not use this file except in compliance with
    7   * the License.  You may obtain a copy of the License at
    8   *
    9   *     http://www.apache.org/licenses/LICENSE-2.0
   10   *
   11   * Unless required by applicable law or agreed to in writing, software
   12   * distributed under the License is distributed on an "AS IS" BASIS,
   13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14   * See the License for the specific language governing permissions and
   15   * limitations under the License.
   16   */
   17   package javax.servlet;
   18   
   19   import java.util.EventListener;
   20   
   21   	/** Implementations of this interface receive notifications of
   22   	** changes to the attribute list on the servlet context of a web application. 
   23   	* To receive notification events, the implementation class
   24   	* must be configured in the deployment descriptor for the web application.
   25   	* @see ServletContextAttributeEvent
   26   	 * @since	v 2.3
   27   	*/
   28   
   29   public interface ServletContextAttributeListener extends EventListener {
   30   	/** Notification that a new attribute was added to the servlet context. Called after the attribute is added.*/
   31   public void attributeAdded(ServletContextAttributeEvent scab);
   32   	/** Notification that an existing attribute has been removed from the servlet context. Called after the attribute is removed.*/
   33   public void attributeRemoved(ServletContextAttributeEvent scab);
   34   	/** Notification that an attribute on the servlet context has been replaced. Called after the attribute is replaced. */
   35   public void attributeReplaced(ServletContextAttributeEvent scab);
   36   }
   37