How to do a callback sort of thing with pyAmf

Is there a well known pattern for handling a case where a client should
get notified when the state of a server/remote object changes?  I figure
I can make the client make a remote call that blocks on a condition
variable in my server and wake it up when the data changes but that
means a thread per client and I don't like how that scales?  

Any pointers or guidance greatly appreciated.

Mike (wishing python had continuations)

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