code: public ServiceFuture<SyncAgentInner> createOrUpdateAsync(String resourceGroupName, String serverName, String syncAgentName, String syncDatabaseId, final ServiceCallback<SyncAgentInner> serviceCallback) {
          return ServiceFuture.fromResponse(createOrUpdateWithServiceResponseAsync(resourceGroupName, serverName, syncAgentName, syncDatabaseId), serviceCallback);
      }
docs: Creates or updates a sync agent.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server on which the sync agent is hosted.
  @param syncAgentName The name of the sync agent.
  @param syncDatabaseId ARM resource id of the sync database in the sync agent.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object