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A Java event based WebSocket and HTTP server

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package org.webbitserver.netty;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
import org.jboss.netty.util.CharsetUtil;

/**
 * Responds with a Flash socket policy file.
 * 
 * 
 * This implementation is based on the 
 * waywardmonkeys/netty-flash-crossdomain-policy-server project and the 
 * Setting up a socket policy file server article.
 * 
 */

public class FlashPolicyFileHandler extends SimpleChannelUpstreamHandler {

	private final int publicPort;

	public FlashPolicyFileHandler(int publicPort) {
		super();
		this.publicPort = publicPort;
	}

	@Override
	public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
			throws Exception {
		Channel ch = e.getChannel();
		ChannelBuffer response = getPolicyFileContents();
		ChannelFuture future = ch.write(response);
		future.addListener(ChannelFutureListener.CLOSE);
		ctx.getPipeline().remove(this);
	}

	private ChannelBuffer getPolicyFileContents() throws Exception {

		return ChannelBuffers.copiedBuffer(
			"\r\n"
			+ "\r\n"
			+ "\r\n"
			+ "  \r\n"
			+ "  \r\n"
			+ "\r\n",
			CharsetUtil.US_ASCII);
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)
			throws Exception {
		e.getCause().printStackTrace();
		e.getChannel().close();
	}

}