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