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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.common;
21  
22  import org.slf4j.Logger;
23  import org.slf4j.LoggerFactory;
24  
25  
26  /**
27   * An abstract adapter class for {@link IoHandler}.  You can extend this
28   * class and selectively override required event handler methods only.  All
29   * methods do nothing by default.
30   *
31   * @author The Apache MINA Project (dev@mina.apache.org)
32   * @version $Rev: 616100 $, $Date: 2008-01-28 15:58:32 -0700 (Mon, 28 Jan 2008) $
33   */
34  public class IoHandlerAdapter implements IoHandler {
35  
36      private final Logger logger = LoggerFactory.getLogger(getClass());
37  
38      public void sessionCreated(IoSession session) throws Exception {
39      }
40  
41      public void sessionOpened(IoSession session) throws Exception {
42      }
43  
44      public void sessionClosed(IoSession session) throws Exception {
45      }
46  
47      public void sessionIdle(IoSession session, IdleStatus status)
48              throws Exception {
49      }
50  
51      public void exceptionCaught(IoSession session, Throwable cause)
52              throws Exception {
53          if (logger.isWarnEnabled()) {
54              logger.warn("EXCEPTION, please implement "
55                      + getClass().getName()
56                      + ".exceptionCaught() for proper handling:", cause);
57          }
58      }
59  
60      public void messageReceived(IoSession session, Object message)
61              throws Exception {
62      }
63  
64      public void messageSent(IoSession session, Object message) throws Exception {
65      }
66  }