Hi Guys,

I don't understand a couple of things about akka streams:
1. are they based on actors or not?
2. I know I should not execute long running operations in actors (blocking 
things) because of the actors thread pool will be blocked. Can I do that 
inside a GraphStage?
3. Why are they 2 ways of defining things like ActorPublisher vs 
SourceShape? Is there a difference in their execution?

The concrete thing is this: I want to write a database Source/Sink. Should 
I just create a blocking call inside the onPush/onPull method?
Or should I use AsyncCallback?

Thanks, Devorb

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