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This is a client library for Nadron server https://github.com/menacher/java-game-server/tree/netty4/nadron. Java clients can use this program to connect and interact with nadron server.

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package io.nadron.client.handlers.netty;

import io.nadron.client.communication.MessageBuffer;
import io.nadron.client.event.Event;
import io.nadron.client.event.Events;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageEncoder;

import java.util.List;


/**
 * Converts an incoming {@link Event} which in turn has a
 * IMessageBuffer payload to a Netty {@link ByteBuf}.
 * Note that {@link Event} instances containing other type of objects as its
 * payload will result in {@link ClassCastException}.
 * 
 * @author Abraham Menacherry.
 * 
 */
// TODO check if MessageToMessageEncoder can be replaced with MessageToByteEncoder
@Sharable
public class MessageBufferEventEncoder extends MessageToMessageEncoder
{

	@Override
	protected void encode(ChannelHandlerContext ctx, Event event,
			List out) throws Exception
	{
		out.add(encode(ctx, event));
	}

	/**
	 * Encode is separated out so that child classes can still reuse this
	 * functionality.
	 * 
	 * @param ctx
	 * @param event
	 *            The event to be encoded into {@link ByteBuf}. It will be
	 *            converted to 'opcode'-'payload' format.
	 * @return If only opcode is specified a single byte {@link ByteBuf} is
	 *         returned, otherwise a byte buf with 'opcode'-'payload' format is
	 *         returned.
	 */
	protected ByteBuf encode(ChannelHandlerContext ctx, Event event)
	{
		ByteBuf out = ctx.alloc().buffer();
		out.writeByte(event.getType());
		if (Events.LOG_IN == event.getType() || Events.RECONNECT == event.getType())
		{
			// write protocol version also
			out.writeByte(Events.PROTOCOL_VERSION);
		}
		
		if (null != event.getSource())
		{
			@SuppressWarnings("unchecked")
			MessageBuffer msgBuffer = (MessageBuffer) event
					.getSource();
			ByteBuf data = msgBuffer.getNativeBuffer();
			out.writeBytes(data);
		}
		return out;
	}

	
}
    

    

    

            

    

            



    
    






    
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