package net.minecraftforge.fml.common.network.simpleimpl;
/**
* A message handler based on {@link IMessage}. Implement and override {@link #onMessage(IMessage)} to
* process your packet. Supply the class to {@link SimpleNetworkWrapper#registerMessage(Class, Class, byte, net.minecraftforge.fml.relauncher.Side)}
* to register both the message type and it's associated handler.
*
* @author cpw
*
* @param <REQ> This is the request type - it is the message you expect to <em>receive</em> from remote.
* @param <REPLY> This is the reply type - it is the message you expect to <em>send</em> in reply. You can use IMessage as the type here
* if you don't anticipate sending a reply.
*/
public interface IMessageHandler<REQ extends IMessage, REPLY extends IMessage> {
/**
* Called when a message is received of the appropriate type. You can optionally return a reply message, or null if no reply
* is needed.
*
* @param message The message
* @return an optional return message
*/
public REPLY onMessage(REQ message, MessageContext ctx);
}