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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.apache.mina.util.SessionLog;
    23  import org.apache.mina.util.SessionUtil;
    24
    25  /**
    26   * An abstract adapter class for {@link IoHandler}.  You can extend this
    27   * class and selectively override required event handler methods only.  All
    28   * methods do nothing by default.
    29   *
    30   * @author The Apache Directory Project (mina-dev@directory.apache.org)
    31   * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $
    32   */
    33  public class IoHandlerAdapter implements IoHandler {
    34      public void sessionCreated(IoSession session) throws Exception {
    35          SessionUtil.initialize(session);
    36      }
    37
    38      public void sessionOpened(IoSession session) throws Exception {
    39      }
    40
    41      public void sessionClosed(IoSession session) throws Exception {
    42      }
    43
    44      public void sessionIdle(IoSession session, IdleStatus status)
    45              throws Exception {
    46      }
    47
    48      public void exceptionCaught(IoSession session, Throwable cause)
    49              throws Exception {
    50          if (SessionLog.isWarnEnabled(session)) {
    51              SessionLog.warn(session, "EXCEPTION, please implement "
    52                      + getClass().getName()
    53                      + ".exceptionCaught() for proper handling:", cause);
    54          }
    55      }
    56
    57      public void messageReceived(IoSession session, Object message)
    58              throws Exception {
    59      }
    60
    61      public void messageSent(IoSession session, Object message) throws Exception {
    62      }
    63  }