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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.example.tennis;
    21
    22  import org.apache.mina.core.service.IoHandler;
    23  import org.apache.mina.core.service.IoHandlerAdapter;
    24  import org.apache.mina.core.session.IoSession;
    25
    26  /**
    27   * A {@link IoHandler} implementation which plays a tennis game.
    28   *
    29   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    30   */
    31  public class TennisPlayer extends IoHandlerAdapter {
    32      private static int nextId = 0;
    33
    34      /** Player ID **/
    35      private final int id = nextId++;
    36
    37      @Override
    38      public void sessionOpened(IoSession session) {
    39          System.out.println("Player-" + id + ": READY");
    40      }
    41
    42      @Override
    43      public void sessionClosed(IoSession session) {
    44          System.out.println("Player-" + id + ": QUIT");
    45      }
    46
    47      @Override
    48      public void messageReceived(IoSession session, Object message) {
    49          System.out.println("Player-" + id + ": RCVD " + message);
    50
    51          TennisBall ball = (TennisBall) message;
    52
    53          // Stroke: TTL decreases and PING/PONG state changes.
    54          ball = ball.stroke();
    55
    56          if (ball.getTTL() > 0) {
    57              // If the ball is still alive, pass it back to peer.
    58              session.write(ball);
    59          } else {
    60              // If the ball is dead, this player loses.
    61              System.out.println("Player-" + id + ": LOSE");
    62              session.close(true);
    63          }
    64      }
    65
    66      @Override
    67      public void messageSent(IoSession session, Object message) {
    68          System.out.println("Player-" + id + ": SENT " + message);
    69      }
    70
    71      @Override
    72      public void exceptionCaught(IoSession session, Throwable cause) {
    73          cause.printStackTrace();
    74          session.close(true);
    75      }
    76  }