ChannelHandler

public class ChannelHandler extends FMLIndexedMessageToMessageCodec<IAssemblyPacket> {
    public ChannelHandler() {
        addDiscriminator(0, PacketSorter.class);
        addDiscriminator(1, PacketCounter.class);
        addDiscriminator(2, PacketCounterData.class);
    }

    @Override
    public void encodeInto(ChannelHandlerContext ctx, IAssemblyPacket packet, ByteBuf data) throws Exception {
        packet.writeBytes(data);
    }

    @Override
    public void decodeInto(ChannelHandlerContext ctx, ByteBuf data, IAssemblyPacket packet) {
        packet.readBytes(data);
        switch (FMLCommonHandler.instance().getEffectiveSide()) {
        case CLIENT:
            packet.executeClient();
            break;
        case SERVER:
            INetHandler netHandler = ctx.channel().attr(NetworkRegistry.NET_HANDLER).get();
            packet.executeServer(((NetHandlerPlayServer) netHandler).playerEntity);
            break;
        }
    }
}