clientsessionhandler.java

MINA自带的一些小例子

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 *  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
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 *  
 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.mina.example.sumup;

import org.apache.mina.common.IoHandler;
import org.apache.mina.common.IoHandlerAdapter;
import org.apache.mina.common.IoSession;
import org.apache.mina.example.sumup.message.AddMessage;
import org.apache.mina.example.sumup.message.ResultMessage;
import org.apache.mina.util.SessionLog;

/**
 * {@link IoHandler} for SumUp client.
 * 
 * @author The Apache Directory Project ([e-mail])
 * @version $Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (금, 13  7월 2007) $
 */
public class ClientSessionHandler extends IoHandlerAdapter {
    private final int[] values;

    private boolean finished;

    public ClientSessionHandler(int[] values) {
        this.values = values;
    }

    public boolean isFinished() {
        return finished;
    }

    public void sessionOpened(IoSession session) {
        // send summation requests
        for (int i = 0; i < values.length; i++) {
            AddMessage m = new AddMessage();
            m.setSequence(i);
            m.setValue(values[i]);
            session.write(m);
        }
    }

    public void messageReceived(IoSession session, Object message) {
        // server only sends ResultMessage. otherwise, we will have to identify
        // its type using instanceof operator.
        ResultMessage rm = (ResultMessage) message;
        if (rm.isOk()) {
            // server returned OK code.
            // if received the result message which has the last sequence
            // number,
            // it is time to disconnect.
            if (rm.getSequence() == values.length - 1) {
                // print the sum and disconnect.
                SessionLog.info(session, "The sum: " + rm.getValue());
                session.close();
                finished = true;
            }
        } else {
            // seever returned error code because of overflow, etc.
            SessionLog.warn(session, "Server error, disconnecting...");
            session.close();
            finished = true;
        }
    }

    public void exceptionCaught(IoSession session, Throwable cause) {
        session.close();
    }
}