001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 *
019 */
020package org.apache.mina.example.sumup;
021
022import org.apache.mina.core.service.IoHandler;
023import org.apache.mina.core.service.IoHandlerAdapter;
024import org.apache.mina.core.session.IoSession;
025import org.apache.mina.example.sumup.message.AddMessage;
026import org.apache.mina.example.sumup.message.ResultMessage;
027import org.slf4j.Logger;
028import org.slf4j.LoggerFactory;
029
030/**
031 * {@link IoHandler} for SumUp client.
032 *
033 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
034 */
035public class ClientSessionHandler extends IoHandlerAdapter {
036
037    private final static Logger LOGGER = LoggerFactory.getLogger(ClientSessionHandler.class);
038    
039    private final int[] values;
040
041    private boolean finished;
042
043    public ClientSessionHandler(int[] values) {
044        this.values = values;
045    }
046
047    public boolean isFinished() {
048        return finished;
049    }
050
051    @Override
052    public void sessionOpened(IoSession session) {
053        // send summation requests
054        for (int i = 0; i < values.length; i++) {
055            AddMessage m = new AddMessage();
056            m.setSequence(i);
057            m.setValue(values[i]);
058            session.write(m);
059        }
060    }
061
062    @Override
063    public void messageReceived(IoSession session, Object message) {
064        // server only sends ResultMessage. otherwise, we will have to identify
065        // its type using instanceof operator.
066        ResultMessage rm = (ResultMessage) message;
067        if (rm.isOk()) {
068            // server returned OK code.
069            // if received the result message which has the last sequence
070            // number,
071            // it is time to disconnect.
072            if (rm.getSequence() == values.length - 1) {
073                // print the sum and disconnect.
074                LOGGER.info("The sum: " + rm.getValue());
075                session.closeNow();
076                finished = true;
077            }
078        } else {
079            // seever returned error code because of overflow, etc.
080            LOGGER.warn("Server error, disconnecting...");
081            session.closeNow();
082            finished = true;
083        }
084    }
085
086    @Override
087    public void exceptionCaught(IoSession session, Throwable cause) {
088        session.closeNow();
089    }
090}