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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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*/
package org.apache.mina.example.sumup;
import org.apache.mina.core.service.IoHandler;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.example.sumup.message.AddMessage;
import org.apache.mina.example.sumup.message.ResultMessage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* {@link IoHandler} for SumUp server.
*
* @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 ServerSessionHandler extends IoHandlerAdapter {
private static final String SUM_KEY = "sum";
private final Logger logger = LoggerFactory.getLogger(getClass());
@Override
public void sessionOpened(IoSession session) {
// set idle time to 60 seconds
session.getConfig().setIdleTime(IdleStatus.BOTH_IDLE, 60);
// initial sum is zero
session.setAttribute(SUM_KEY, new Integer(0));
}
@Override
public void messageReceived(IoSession session, Object message) {
// client only sends AddMessage. otherwise, we will have to identify
// its type using instanceof operator.
AddMessage am = (AddMessage) message;
// add the value to the current sum.
int sum = ((Integer) session.getAttribute(SUM_KEY)).intValue();
int value = am.getValue();
long expectedSum = (long) sum + value;
if (expectedSum > Integer.MAX_VALUE || expectedSum < Integer.MIN_VALUE) {
// if the sum overflows or underflows, return error message
ResultMessage rm = new ResultMessage();
rm.setSequence(am.getSequence()); // copy sequence
rm.setOk(false);
session.write(rm);
} else {
// sum up
sum = (int) expectedSum;
session.setAttribute(SUM_KEY, new Integer(sum));
// return the result message
ResultMessage rm = new ResultMessage();
rm.setSequence(am.getSequence()); // copy sequence
rm.setOk(true);
rm.setValue(sum);
session.write(rm);
}
}
@Override
public void sessionIdle(IoSession session, IdleStatus status) {
logger.info("Disconnecting the idle.");
// disconnect an idle client
session.close(true);
}
@Override
public void exceptionCaught(IoSession session, Throwable cause) {
// close the connection on exceptional situation
session.close(true);
}
}