[Twisted-Python] Deferred.setTimeout is deprecated, replacement ideas?
gabriel.rossetti at arimaz.com
Wed Jul 16 05:22:09 EDT 2008
Gabriel Rossetti wrote:
> Hello everyone,
> I was going to use Deferred.setTimeout until I saw that it was
> deprecated. Does anyone know why? I found it handy and I find that
> case-per-case replacements tend to be complicated. Does anyone have
> any ideas on how to replace it?
> I have a queue containing read results from I/O, the get() method
> returns a deferred fired when the data arrives (sort of like
> defer.DeferredQueue). Since I need to be able to set a read timeout,
> i.e. if the data doesn't arrive after a certain time, I need to raise
> an exception and remove the deferred from the internal list; the
> defer's timeout would have been handy here :-(.
> I was thinking of doing something like this, if data isn't present in
> the data internal list:
> d = Deferred()
> dc = reactor.callLater(self.timeout, self.__timeoutCallback, d)
> Then a tuple containing the Deferred ("d"), the DelayedCall ("dc") is
> then put in the internal waiting list. If the timeout doesn't expire
> before the data arrives, then the DelayedCall is canceled, if it does
> expire then the tuple is removed from the queue (potentially slow) and
> an exception is raised.
> Is there a better way of doing this? Any ideas?
> Thank you,
I can remove the "d.addCallback(self.__timeoutCanceller)" call since the
DelayedCall can be canceled by the code that does the waiting list
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