code: public ServiceFuture<CheckAvailabilityResultInner> checkNotificationHubAvailabilityAsync(String resourceGroupName, String namespaceName, CheckAvailabilityParameters parameters, final ServiceCallback<CheckAvailabilityResultInner> serviceCallback) {
          return ServiceFuture.fromResponse(checkNotificationHubAvailabilityWithServiceResponseAsync(resourceGroupName, namespaceName, parameters), serviceCallback);
      }
docs: Checks the availability of the given notificationHub in a namespace.
  
  @param resourceGroupName The name of the resource group.
  @param namespaceName The namespace name.
  @param parameters The notificationHub name.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object