code: @Override
      public java.util.concurrent.Future<DescribeCustomerGatewaysResult> describeCustomerGatewaysAsync(
              com.amazonaws.handlers.AsyncHandler<DescribeCustomerGatewaysRequest, DescribeCustomerGatewaysResult> asyncHandler) {
  
          return describeCustomerGatewaysAsync(new DescribeCustomerGatewaysRequest(), asyncHandler);
      }
docs: Simplified method form for invoking the DescribeCustomerGateways operation with an AsyncHandler.
  
  @see #describeCustomerGatewaysAsync(DescribeCustomerGatewaysRequest, com.amazonaws.handlers.AsyncHandler)