private ResponseCommand createResponseCommand(short cmdCode) {
        ResponseCommand command = new RpcResponseCommand();
        command.setCmdCode(RpcCommandCode.valueOf(cmdCode));
        return command;
    }
@see CommandDecoder#decode(ChannelHandlerContext, ByteBuf, List)
src/main/java/com/alipay/remoting/rpc/protocol/RpcCommandDecoderV2.java