[Buildbot-devel] deferreds from polling change source

Tom Prince tom.prince at ualberta.net
Thu Jun 27 23:14:26 UTC 2013

Jorge Gonzalez <gjorge at google.com> writes:
>   def poll(self):
>     defered_poll = defer.Deferred()
>     defered_poll.addCallback(lambda _: self.DoTheActualPoll())
>     defered_poll.callback(None)
>     return defered_poll

`.doTheActualPoll` will just be called when `.callback` is
called. Deferreds don't magically make something asynchronous, they are
just a way of organizing callbacks.

The right way to do this is to change `.doTheActualPoll` to be
asynchronous. How to do this will depend on what is doing. Anything else
will cause everything to freeze while it is running.


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