Suppose I have 2 servers.
The first is a service that provides some computations, which can last long time (minutes to hours).
The second server will use this service to have some data computed.
I'm trying to design a REST API for the first server and so far so good. But I'd like to hear some opinion on how to model notifications when the long lasting task is finished.
I considered 2 approaches so far:
- Polling - the second server will ask every now and then about the result.
- Callback - Second server will setup an uri for the first one to call after it is done. But this smells a bit in REST API.
What do you think?