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.core.service;
21
22 import org.apache.mina.core.session.IdleStatus;
23 import org.apache.mina.core.session.IoSession;
24 import org.slf4j.Logger;
25 import org.slf4j.LoggerFactory;
26
27
28 /**
29 * An abstract adapter class for {@link IoHandler}. You can extend this
30 * class and selectively override required event handler methods only. All
31 * methods do nothing by default.
32 *
33 * @author The Apache MINA Project (dev@mina.apache.org)
34 */
35 public class IoHandlerAdapter implements IoHandler {
36 private static final Logger LOGGER = LoggerFactory.getLogger(IoHandlerAdapter.class);
37
38 public void sessionCreated(IoSession session) throws Exception {
39 // Empty handler
40 }
41
42 public void sessionOpened(IoSession session) throws Exception {
43 // Empty handler
44 }
45
46 public void sessionClosed(IoSession session) throws Exception {
47 // Empty handler
48 }
49
50 public void sessionIdle(IoSession session, IdleStatus status)
51 throws Exception {
52 // Empty handler
53 }
54
55 public void exceptionCaught(IoSession session, Throwable cause)
56 throws Exception {
57 if (LOGGER.isWarnEnabled()) {
58 LOGGER.warn("EXCEPTION, please implement "
59 + getClass().getName()
60 + ".exceptionCaught() for proper handling:", cause);
61 }
62 }
63
64 public void messageReceived(IoSession session, Object message)
65 throws Exception {
66 // Empty handler
67 }
68
69 public void messageSent(IoSession session, Object message) throws Exception {
70 // Empty handler
71 }
72 }