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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  }