[CalendarServer-dev] Implementing an Async Directory Service

Greets all, I have implemented two custom directory services by sub-classing DirectoryService and implementing interface IDirectoryService. One service interfaces with postgres, the other a JSON REST API, both handle only "groups" and "users" principal types. As it stands both these directory services return synchronous results, is there a standard way for me to integrate a custom async directory service with Darwin Calendar Server? cheers, -- rhodey ˙ ͜ʟ˙