launchpad-dev team mailing list archive

[Muharem Hrnjadovic <muharem@xxxxxxxxxx>]

Julian Edwards wrote:
> On Thursday 08 October 2009 22:21:20 Aaron Bentley wrote:
>> I don't think so.  It's no coincidence that Muharem presented a Job
>> system as a use case at the Epic.  Polling will never be as responsive
>> or efficient as messaging.
> 
> I disagree with the word "never".
> 
> I am a huge fan of messaging systems and I have a lot of experience
> with them and also with polling-based solutions.
> 
> Consider the situation where you have several updates causing diff
> requests on the same branch.  You're only interested in the last
> change; with a message for each diff request, calculating the diffs
> in-between is a waste as you will throw them away with subsequent diff
> processing.  If you were to periodically poll, you would see only the
> most recent change and work with that.
> 
> This is a slightly contrived example but you get my drift.
> 
> Basically, there is a trade-off between responsiveness and efficient 
> processing.

I forgot to mention that this trade-off is much less of an issue for
operations that may be easily/safely cancelled.

Pushing to a branch would e.g. generate a diff generation request as
well as a cancellation request for any diff generation operations in
progress.

Best regards

-- 
Muharem Hrnjadovic <muharem@xxxxxxxxxx>
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