code: @Override
      public AddUploadBufferResult addUploadBuffer(AddUploadBufferRequest request) {
          request = beforeClientExecution(request);
          return executeAddUploadBuffer(request);
      }
docs: <p>
  Configures one or more gateway local disks as upload buffer for a specified gateway. This operation is supported
  for the stored volume, cached volume and tape gateway types.
  </p>
  <p>
  In the request, you specify the gateway Amazon Resource Name (ARN) to which you want to add upload buffer, and
  one or more disk IDs that you want to configure as upload buffer.
  </p>
  
  @param addUploadBufferRequest
  @return Result of the AddUploadBuffer 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.AddUploadBuffer
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/AddUploadBuffer" target="_top">AWS
  API Documentation</a>