/* *  Licensed to the Apache Software Foundation (ASF) under one *  or more contributor license agreements.  See the NOTICE file *  distributed with this work for additional information *  regarding copyright ownership.  The ASF licenses this file *  to you under the Apache License, Version 2.0 (the *  "License"); you may not use this file except in compliance *  with the License.  You may obtain a copy of the License at * *    http://www.apache.org/licenses/LICENSE-2.0 * *  Unless required by applicable law or agreed to in writing, *  software distributed under the License is distributed on an *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *  KIND, either express or implied.  See the License for the *  specific language governing permissions and limitations *  under the License. * */package org.apache.mina.example.tennis;import org.apache.mina.core.service.IoHandler;import org.apache.mina.core.service.IoHandlerAdapter;import org.apache.mina.core.session.IoSession;/** * A {@link IoHandler} implementation which plays a tennis game. * * @author The Apache MINA Project (dev@mina.apache.org) * @version $Rev: 713957 $, $Date: 2008-11-14 10:27:16 +0100 (Fri, 14 Nov 2008) $ */public class TennisPlayer extends IoHandlerAdapter {    private static int nextId = 0;    /** Player ID **/    private final int id = nextId++;    @Override    public void sessionOpened(IoSession session) {        System.out.println("Player-" + id + ": READY");    }    @Override    public void sessionClosed(IoSession session) {        System.out.println("Player-" + id + ": QUIT");    }    @Override    public void messageReceived(IoSession session, Object message) {        System.out.println("Player-" + id + ": RCVD " + message);        TennisBall ball = (TennisBall) message;        // Stroke: TTL decreases and PING/PONG state changes.        ball = ball.stroke();        if (ball.getTTL() > 0) {            // If the ball is still alive, pass it back to peer.            session.write(ball);        } else {            // If the ball is dead, this player loses.            System.out.println("Player-" + id + ": LOSE");            session.close(true);        }    }    @Override    public void messageSent(IoSession session, Object message) {        System.out.println("Player-" + id + ": SENT " + message);    }    @Override    public void exceptionCaught(IoSession session, Throwable cause) {        cause.printStackTrace();        session.close(true);    }}