PacketRequestFoo.class

public class PacketRequestFOO implements IMessage{
    public PacketRequestFOO(){}

    @Override
    public void fromBytes(ByteBuf buf) {
        //I don't need to do anything here since I have no data to transmit, right?
        //I'm just signaling the server to do something

        System.out.println("X - " + SIDE);
    }

    @Override
    public void toBytes(ByteBuf buf) {
        System.out.println("Y - " + SIDE);
    };

    public static class Handler implements IMessageHandler<PacketRequestFOO, IMessage>{
        @Override
        public IMessage onMessage(PacketRequestFOO message, MessageContext ctx) {
            if(SIDE == SERVER){
                System.out.println("PACKET RECEIVED");
                IThreadListener mainThread = (WorldServer) ctx.getServerHandler().playerEntity.worldObj;
                mainThread.addScheduledTask(new Runnable(){
                    @Override
                    public void run() {
                        Main.getFOO().doBAR((ctx.getServerHandler().playerEntity));
                    }
                });
                return null;
            }
            else{
                return null;
            }
        }
    }
}