proxylogichandler.java

mina是以Java实现的一个开源的网络程序框架

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 *  Licensed to the Apache Software Foundation (ASF) under one
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 *  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.proxy;

import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.filterchain.IoFilter.NextFilter;
import org.apache.mina.core.write.WriteRequest;
import org.apache.mina.proxy.session.ProxyIoSession;

/**
 * ProxyLogicHandler.java - Interface implemented by classes containing proxy type specific logic.
 * 
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev: 759663 $, $Date: 2009-03-29 12:46:40 +0200 (Sun, 29 Mar 2009) $
 * @since MINA 2.0.0-M3
 */
public interface ProxyLogicHandler {
    /**
     * Tests if handshake process is complete.
     * 
     * @return <code>true</code> if handshaking is complete and
     * data can be sent through the proxy, false otherwise.
     */
    public abstract boolean isHandshakeComplete();

    /**
     * Handle incoming data during the handshake process. Should consume only the
     * handshake data from the buffer, leaving any extra data in place.
     * 
     * @param nextFilter the next filter in the filter chain
     * @param buf the buffer holding the received data
     * @throws ProxyAuthException if authentication fails
     */
    public abstract void messageReceived(NextFilter nextFilter, IoBuffer buf)
            throws ProxyAuthException;

    /**
     * Called at each step of the handshake procedure.
     * 
     * @param nextFilter the next filter in filter chain
     * @throws ProxyAuthException if authentication fails
     */
    public abstract void doHandshake(NextFilter nextFilter)
            throws ProxyAuthException;

    /**
     * Returns the {@link ProxyIoSession}.
     * 
     * @return the proxy session object
     */
    public abstract ProxyIoSession getProxyIoSession();

    /**
     * Enqueue a message to be written once handshaking is complete.
     * 
     * @param nextFilter the next filter in filter chain
     * @param writeRequest the data to be written
     */
    public abstract void enqueueWriteRequest(final NextFilter nextFilter,
            final WriteRequest writeRequest);
}