docs: public void marshall(DataTransfer dataTransfer, ProtocolMarshaller protocolMarshaller) {
  
          if (dataTransfer == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(dataTransfer.getBytesTransferred(), BYTESTRANSFERRED_BINDING);
              protocolMarshaller.marshall(dataTransfer.getObjectsTransferred(), OBJECTSTRANSFERRED_BINDING);
              protocolMarshaller.marshall(dataTransfer.getTotalBytes(), TOTALBYTES_BINDING);
              protocolMarshaller.marshall(dataTransfer.getTotalObjects(), TOTALOBJECTS_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }