code: @Override
      public DescribeUploadBufferResult describeUploadBuffer(DescribeUploadBufferRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeUploadBuffer(request);
      }
docs: <p>
  Returns information about the upload buffer of a gateway. This operation is supported for the stored volume,
  cached volume and tape gateway types.
  </p>
  <p>
  The response includes disk IDs that are configured as upload buffer space, and it includes the amount of upload
  buffer space allocated and used.
  </p>
  
  @param describeUploadBufferRequest
  @return Result of the DescribeUploadBuffer operation returned by the service.
  @throws InvalidGatewayRequestException
  An exception occurred because an invalid gateway request was issued to the service. For more information,
  see the error and message fields.
  @throws InternalServerErrorException
  An internal server error has occurred during the request. For more information, see the error and message
  fields.
  @sample AWSStorageGateway.DescribeUploadBuffer
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/DescribeUploadBuffer"
  target="_top">AWS API Documentation</a>