code: @Override
      public GetNotificationChannelResult getNotificationChannel(GetNotificationChannelRequest request) {
          request = beforeClientExecution(request);
          return executeGetNotificationChannel(request);
      }
docs: <p>
  Returns information about the Amazon Simple Notification Service (SNS) topic that is used to record AWS Firewall
  Manager SNS logs.
  </p>
  
  @param getNotificationChannelRequest
  @return Result of the GetNotificationChannel operation returned by the service.
  @throws ResourceNotFoundException
  The specified resource was not found.
  @throws InvalidOperationException
  The operation failed because there was nothing to do. For example, you might have submitted an
  <code>AssociateAdminAccount</code> request, but the account ID that you submitted was already set as the
  AWS Firewall Manager administrator.
  @throws InternalErrorException
  The operation failed because of a system problem, even though the request was valid. Retry your request.
  @sample AWSFMS.GetNotificationChannel
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/fms-2018-01-01/GetNotificationChannel" target="_top">AWS API
  Documentation</a>