Re: [Twisted-Python] Retrying function calls
Hi Blair Looks pretty good. To streamline the usage and make the intent more apparent from a brief glance at the header you might consider turning it into a decorator, like Thanks for the suggestion the pointer. I'd not seen that page. I don't think this is well suited to decorators, at least not with the kinds of usages I am imagining. If you decorate a function, it's done once and for all. So anyone who calls the function gets the single one-size-fits-all decorated behavior. I'd rather the behavior was left in the hands of the caller. That's kind of the point: give the caller flexible control over what happens if something goes wrong, including passing in your custom failure handler, etc. Maybe a hybrid approach would be more useful: write a function which, passed a function, returns a retrying version of that function that returns a deferred that fires when the original function has succeeded (or ultimately failed). The result could then be passed around, called by multiple pieces of code, etc. Hmmm... Thanks again. Terry ___ Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
Re: [Twisted-Python] Retrying function calls
On Sun, Nov 01, 2009 at 05:53:31PM +0100, Terry Jones wrote: def simpleBackoffIterator(maxResults=10, maxDelay=5.0, now=True, initDelay=0.01, incFunc=None): assert maxResults 0 remaining = maxResults delay = initDelay incFunc = incFunc or partial(mul, 2.0) if now: yield 0.0 remaining -= 1 while True: if remaining == 0: raise StopIteration yield (delay if delay maxDelay else maxDelay) delay = incFunc(delay) remaining -= 1 Since this is a generator function, it will automatically raise StopIteration once control-flow falls off the end of the function, so your while-loop could just be written: while remaining 0: yield (delay if delay maxDelay else maxDelay) delay = incFunc(delay) remaining -= 1 ...making the function of the remaining counter just a little more explicit. ___ Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
Re: [Twisted-Python] Retrying function calls
Hi Tim Since this is a generator function, it will automatically raise StopIteration once control-flow falls off the end of the function, so your while-loop could just be written: Ah yes, thanks a lot. Terry ___ Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
