01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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:
33: /** Notification that an existing attribute has been removed from the servlet context. Called after the attribute is removed.*/
34: public void attributeRemoved(ServletContextAttributeEvent scab);
35:
36: /** Notification that an attribute on the servlet context has been replaced. Called after the attribute is replaced. */
37: public void attributeReplaced(ServletContextAttributeEvent scab);
38: }
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