01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
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: * <tt>messageReceived</tt> or <tt>messageSent</tt> events to. You have to
27: * register your handler with the type of the message you want to get notified
28: * using {@link DemuxingIoHandler#addReceivedMessageHandler(Class, MessageHandler)}
29: * or {@link DemuxingIoHandler#addSentMessageHandler(Class, MessageHandler)}.
30: *
31: * @author The Apache MINA Project (dev@mina.apache.org)
32: * @version $Rev: 603158 $, $Date: 2007-12-11 00:06:13 -0700 (Tue, 11 Dec 2007) $
33: */
34: public interface MessageHandler<E> {
35: /**
36: * A {@link MessageHandler} that does nothing. This is useful when
37: * you want to ignore a message of a specific type silently.
38: */
39: static MessageHandler<Object> NOOP = new MessageHandler<Object>() {
40: public void handleMessage(IoSession session, Object message) {
41: }
42: };
43:
44: /**
45: * Invoked when the specific type of message is received from or sent to
46: * the specified <code>session</code>.
47: */
48: void handleMessage(IoSession session, E message) throws Exception;
49: }
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