private ResponseCommand createResponseCommand(short cmdCode) {
        ResponseCommand command = new RpcResponseCommand();
        command.setCmdCode(RpcCommandCode.valueOf(cmdCode));
        return command;
    }
@see com.alipay.remoting.CommandDecoder#decode(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf, java.util.List)
src/main/java/com/alipay/remoting/rpc/protocol/RpcCommandDecoder.java