code: @Override
      public DescribeTransitGatewayAttachmentsResult describeTransitGatewayAttachments(DescribeTransitGatewayAttachmentsRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeTransitGatewayAttachments(request);
      }
docs: <p>
  Describes one or more attachments between resources and transit gateways. By default, all attachments are
  described. Alternatively, you can filter the results by attachment ID, attachment state, resource ID, or resource
  owner.
  </p>
  
  @param describeTransitGatewayAttachmentsRequest
  @return Result of the DescribeTransitGatewayAttachments operation returned by the service.
  @sample AmazonEC2.DescribeTransitGatewayAttachments
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/DescribeTransitGatewayAttachments"
  target="_top">AWS API Documentation</a>