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
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 package javax.servlet;
19 import java.util.EventListener;
22 * Implementations of this interface receive notifications of changes to the
23 * attribute list on the servlet context of a web application. To receive
24 * notification events, the implementation class must be configured in the
25 * deployment descriptor for the web application.
27 * @see ServletContextAttributeEvent
31 public interface ServletContextAttributeListener extends EventListener {
33 * Notification that a new attribute was added to the servlet context.
34 * Called after the attribute is added.
36 public void attributeAdded(ServletContextAttributeEvent scab);
39 * Notification that an existing attribute has been removed from the servlet
40 * context. Called after the attribute is removed.
42 public void attributeRemoved(ServletContextAttributeEvent scab);
45 * Notification that an attribute on the servlet context has been replaced.
46 * Called after the attribute is replaced.
48 public void attributeReplaced(ServletContextAttributeEvent scab);