code: @Override
      public ListListenersResult listListeners(ListListenersRequest request) {
          request = beforeClientExecution(request);
          return executeListListeners(request);
      }
docs: <p>
  List the listeners for an accelerator.
  </p>
  
  @param listListenersRequest
  @return Result of the ListListeners operation returned by the service.
  @throws AcceleratorNotFoundException
  The accelerator that you specified doesn't exist.
  @throws InvalidNextTokenException
  There isn't another item to return.
  @throws InternalServiceErrorException
  There was an internal error for AWS Global Accelerator.
  @sample AWSGlobalAccelerator.ListListeners
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/globalaccelerator-2018-08-08/ListListeners"
  target="_top">AWS API Documentation</a>