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 * An adapter class for {@link IoHandler}. You can extend this
29 * class and selectively override required event handler methods only. All
30 * methods do nothing by default.
31 *
32 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
33 */
34 public class IoHandlerAdapter implements IoHandler {
35 private static final Logger LOGGER = LoggerFactory.getLogger(IoHandlerAdapter.class);
36
37 /**
38 * {@inheritDoc}
39 */
40 @Override
41 public void sessionCreated(IoSession session) throws Exception {
42 // Empty handler
43 }
44
45 /**
46 * {@inheritDoc}
47 */
48 @Override
49 public void sessionOpened(IoSession session) throws Exception {
50 // Empty handler
51 }
52
53 /**
54 * {@inheritDoc}
55 */
56 @Override
57 public void sessionClosed(IoSession session) throws Exception {
58 // Empty handler
59 }
60
61 /**
62 * {@inheritDoc}
63 */
64 @Override
65 public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
66 // Empty handler
67 }
68
69 /**
70 * {@inheritDoc}
71 */
72 @Override
73 public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
74 if (LOGGER.isWarnEnabled()) {
75 LOGGER.warn("EXCEPTION, please implement " + getClass().getName()
76 + ".exceptionCaught() for proper handling:", cause);
77 }
78 }
79
80 /**
81 * {@inheritDoc}
82 */
83 @Override
84 public void messageReceived(IoSession session, Object message) throws Exception {
85 // Empty handler
86 }
87
88 /**
89 * {@inheritDoc}
90 */
91 @Override
92 public void messageSent(IoSession session, Object message) throws Exception {
93 // Empty handler
94 }
95
96 /**
97 * {@inheritDoc}
98 */
99 @Override
100 public void inputClosed(IoSession session) throws Exception {
101 session.closeNow();
102 }
103 }