code: public ServiceFuture<List<PerformanceTierPropertiesInner>> listAsync(String locationName, final ServiceCallback<List<PerformanceTierPropertiesInner>> serviceCallback) {
          return ServiceFuture.fromResponse(listWithServiceResponseAsync(locationName), serviceCallback);
      }
docs: List all the performance tiers at specified location in a given subscription.
  
  @param locationName The name of the location.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object