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Netty-Websocket Transmitter for SynchronizeFX

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/**
 * This file is part of SynchronizeFX.
 * 
 * Copyright (C) 2013 Saxonia Systems AG
 *
 * SynchronizeFX is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * SynchronizeFX is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with SynchronizeFX. If not, see .
 */

package de.saxsys.synchronizefx.nettywebsocket;

import java.util.List;

import de.saxsys.synchronizefx.core.clientserver.NetworkToTopologyCallbackClient;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

/**
 * This class represents the websocket connection to the server.
 * 
 * For the protocol used see the class Javadoc of de.saxsys.synchronizefx.tomcat.SynchronizeFXTomcatServlet in the
 * module tomcat-transmitter.
 */
class InboundCommandHandler extends SimpleChannelInboundHandler> {

    private NetworkToTopologyCallbackClient callback;

    /**
     * Inititalizes the connection.
     * 
     * @param callback The callback to the upper layer to inform it on new messages and errors.
     */
    public InboundCommandHandler(final NetworkToTopologyCallbackClient callback) {
        this.callback = callback;
    }

    @Override
    protected void channelRead0(final ChannelHandlerContext ctx, final List