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Java > Open Source Codes > org > apache > mina > handler > demux > MessageHandler


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements. See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership. The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the
7  * "License"); you may not use this file except in compliance
8  * with the License. You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing,
13  * software distributed under the License is distributed on an
14  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15  * KIND, either express or implied. See the License for the
16  * specific language governing permissions and limitations
17  * under the License.
18  *
19  */
20 package org.apache.mina.handler.demux;
21
22 import org.apache.mina.common.IoSession;
23
24 /**
25  * A handler interface that {@link DemuxingIoHandler} forwards
26  * <code>messageReceived</code> events to. You have to register your
27  * handler with the type of message you want to get notified using
28  * {@link DemuxingIoHandler#addMessageHandler(Class, MessageHandler)}.
29  *
30  * @author The Apache Directory Project (mina-dev@directory.apache.org)
31  * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (금, 13 7월 2007) $
32  */
33 public interface MessageHandler<E> {
34     /**
35      * A {@link MessageHandler} that does nothing. This is usefule when
36      * you want to ignore messages of the specific type silently.
37      */
38     static MessageHandler<Object JavaDoc> NOOP = new MessageHandler<Object JavaDoc>() {
39         public void messageReceived(IoSession session, Object JavaDoc message) {
40         }
41     };
42
43     /**
44      * Invoked when the specific type of message is received from the
45      * specified <code>session</code>.
46      */
47     void messageReceived(IoSession session, E message) throws Exception JavaDoc;
48 }
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