code: public ServiceFuture<List<EventSubscriptionInner>> listAsync(final ServiceCallback<List<EventSubscriptionInner>> serviceCallback) {
          return ServiceFuture.fromResponse(listWithServiceResponseAsync(), serviceCallback);
      }
docs: Get an aggregated list of all global event subscriptions under an Azure subscription.
  List all aggregated global event subscriptions under a specific Azure subscription.
  
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @return the {@link ServiceFuture} object