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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.handler.multiton;
    21
    22  import org.apache.mina.common.IdleStatus;
    23  import org.apache.mina.common.IoHandler;
    24  import org.apache.mina.common.IoSession;
    25
    26  /**
    27   * An {@link IoHandler} implementation which delegates all requests to
    28   * {@link SingleSessionIoHandler}s.  A {@link SingleSessionIoHandlerFactory}
    29   * is used to create a new {@link SingleSessionIoHandler} for each newly
    30   * created session.
    31   *
    32   * @author The Apache Directory Project (mina-dev@directory.apache.org)
    33   * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $
    34   */
    35  public class SingleSessionIoHandlerDelegate implements IoHandler {
    36      /**
    37       * The key used to store the {@link SingleSessionIoHandler} as a session
    38       * attribute.
    39       */
    40      public static final String HANDLER = SingleSessionIoHandlerDelegate.class
    41              .getName()
    42              + ".handler";
    43
    44      /**
    45       * The {@link SingleSessionIoHandlerFactory} used to create new
    46       * {@link SingleSessionIoHandler}s.
    47       */
    48      private final SingleSessionIoHandlerFactory factory;
    49
    50      /**
    51       * Creates a new instance that uses the passed in
    52       * {@link SingleSessionIoHandlerFactory} to create new
    53       * {@link SingleSessionIoHandler}s.
    54       *
    55       * @param factory  the factory for {@link SingleSessionIoHandler}s
    56       */
    57      public SingleSessionIoHandlerDelegate(SingleSessionIoHandlerFactory factory) {
    58          if (factory == null) {
    59              throw new NullPointerException("factory");
    60          }
    61          this.factory = factory;
    62      }
    63
    64      /**
    65       * Creates a new instance with the factory passed to the constructor of
    66       * this class.  The created handler is stored as a session
    67       * attribute named {@link #HANDLER}.
    68       *
    69       * @see org.apache.mina.common.IoHandler#sessionCreated(org.apache.mina.common.IoSession)
    70       */
    71      public void sessionCreated(IoSession session) throws Exception {
    72          SingleSessionIoHandler handler = factory.getHandler(session);
    73          session.setAttribute(HANDLER, handler);
    74          handler.sessionCreated();
    75      }
    76
    77      /**
    78       * Delegates the method call to the
    79       * {@link SingleSessionIoHandler#sessionOpened()} method of the handler
    80       * assigned to this session.
    81       */
    82      public void sessionOpened(IoSession session) throws Exception {
    83          SingleSessionIoHandler handler = (SingleSessionIoHandler) session
    84                  .getAttribute(HANDLER);
    85          handler.sessionOpened();
    86      }
    87
    88      /**
    89       * Delegates the method call to the
    90       * {@link SingleSessionIoHandler#sessionClosed()} method of the handler
    91       * assigned to this session.
    92       */
    93      public void sessionClosed(IoSession session) throws Exception {
    94          SingleSessionIoHandler handler = (SingleSessionIoHandler) session
    95                  .getAttribute(HANDLER);
    96          handler.sessionClosed();
    97      }
    98
    99      /**
    100      * Delegates the method call to the
    101      * {@link SingleSessionIoHandler#sessionIdle(IdleStatus)} method of the
    102      * handler assigned to this session.
    103      */
    104     public void sessionIdle(IoSession session, IdleStatus status)
    105             throws Exception {
    106         SingleSessionIoHandler handler = (SingleSessionIoHandler) session
    107                 .getAttribute(HANDLER);
    108         handler.sessionIdle(status);
    109     }
    110
    111     /**
    112      * Delegates the method call to the
    113      * {@link SingleSessionIoHandler#exceptionCaught(Throwable)} method of the
    114      * handler assigned to this session.
    115      */
    116     public void exceptionCaught(IoSession session, Throwable cause)
    117             throws Exception {
    118         SingleSessionIoHandler handler = (SingleSessionIoHandler) session
    119                 .getAttribute(HANDLER);
    120         handler.exceptionCaught(cause);
    121     }
    122
    123     /**
    124      * Delegates the method call to the
    125      * {@link SingleSessionIoHandler#messageReceived(Object)} method of the
    126      * handler assigned to this session.
    127      */
    128     public void messageReceived(IoSession session, Object message)
    129             throws Exception {
    130         SingleSessionIoHandler handler = (SingleSessionIoHandler) session
    131                 .getAttribute(HANDLER);
    132         handler.messageReceived(message);
    133     }
    134
    135     /**
    136      * Delegates the method call to the
    137      * {@link SingleSessionIoHandler#messageSent(Object)} method of the handler
    138      * assigned to this session.
    139      */
    140     public void messageSent(IoSession session, Object message) throws Exception {
    141         SingleSessionIoHandler handler = (SingleSessionIoHandler) session
    142                 .getAttribute(HANDLER);
    143         handler.messageSent(message);
    144     }
    145 }