abstractproxyiohandler.java

MINA自带的一些小例子

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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
 *  "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.proxy;

import java.nio.charset.Charset;

import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.IoHandlerAdapter;
import org.apache.mina.common.IoSession;
import org.apache.mina.common.TrafficMask;
import org.apache.mina.util.SessionLog;

/**
 * Base class of {@link org.apache.mina.common.IoHandler} classes which handle
 * proxied connections.
 *
 * @author The Apache Directory Project ([e-mail])
 * @version $Rev$, $Date$
 *
 */
public abstract class AbstractProxyIoHandler extends IoHandlerAdapter {
    private static Charset CHARSET = Charset.forName("iso8859-1");

    public void sessionCreated(IoSession session) throws Exception {
        session.setTrafficMask(TrafficMask.NONE);
    }

    public void sessionClosed(IoSession session) throws Exception {
        if (session.getAttachment() != null) {
            ((IoSession) session.getAttachment()).setAttachment(null);
            ((IoSession) session.getAttachment()).close();
            session.setAttachment(null);
        }
    }

    public void messageReceived(IoSession session, Object message)
            throws Exception {
        ByteBuffer rb = (ByteBuffer) message;
        ByteBuffer wb = ByteBuffer.allocate(rb.remaining());
        rb.mark();
        wb.put(rb);
        wb.flip();
        ((IoSession) session.getAttachment()).write(wb);
        rb.reset();
        SessionLog.info(session, rb.getString(CHARSET.newDecoder()));
    }
}