code: public ServiceFuture<NetworkWatcherInner> createOrUpdateAsync(String resourceGroupName, String networkWatcherName, NetworkWatcherInner parameters, final ServiceCallback<NetworkWatcherInner> serviceCallback) {
          return ServiceFuture.fromResponse(createOrUpdateWithServiceResponseAsync(resourceGroupName, networkWatcherName, parameters), serviceCallback);
      }
docs: Creates or updates a network watcher in the specified resource group.
  
  @param resourceGroupName The name of the resource group.
  @param networkWatcherName The name of the network watcher.
  @param parameters Parameters that define the network watcher resource.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object