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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      public void sessionCreated(IoSession session) throws Exception {
38          // Empty handler
39      }
40  
41      public void sessionOpened(IoSession session) throws Exception {
42          // Empty handler
43      }
44  
45      public void sessionClosed(IoSession session) throws Exception {
46          // Empty handler
47      }
48  
49      public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
50          // Empty handler
51      }
52  
53      public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
54          if (LOGGER.isWarnEnabled()) {
55              LOGGER.warn("EXCEPTION, please implement " + getClass().getName()
56                      + ".exceptionCaught() for proper handling:", cause);
57          }
58      }
59  
60      public void messageReceived(IoSession session, Object message) throws Exception {
61          // Empty handler
62      }
63  
64      public void messageSent(IoSession session, Object message) throws Exception {
65          // Empty handler
66      }
67  
68      public void inputClosed(IoSession session) throws Exception {
69          session.close(true);
70      }
71  }