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 (Fri, 13 Jul 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> NOOP = new MessageHandler<Object>() {
39 public void messageReceived(IoSession session, Object 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;
48 }