[Twisted-Python] Adbapi issues

Gerrat Rickert grickert at coldstorage.com
Thu Aug 6 16:06:34 EDT 2009

>-----Original Message-----
>From: twisted-python-bounces at twistedmatrix.com [mailto:twisted-python-
>bounces at twistedmatrix.com] On Behalf Of exarkun at twistedmatrix.com
>Sent: Thursday, August 06, 2009 3:25 PM
>To: Twisted general discussion
>Subject: Re: [Twisted-Python] Adbapi issues
>On 06:57 pm, grickert at coldstorage.com wrote:
>>>Supporting arraysize in some form is probably a good idea. Another
>>>ticket is in order.
>>Ok, I filed ticket #3956
>>...along with a patch for adbapi.py, and test_adbapi.py.
>Great.  Thanks a lot! :)
>>My apologies in advance for the test patch :o)
>>I haven't written many tests, so I'm not exactly sure the best
>>(or perhaps even a good way) of testing some things.
>No worries.  I've given you some feedback on the ticket (I did that
>before I noticed this email).  Please feel free to ask if anything
>I wrote is unclear.

Wow, the feedback on the patch (attempt) had a much gentler tone than I
expected ;o)  Thanks.  I'll see what I can improve.

>>...my understanding is that it's relatively easy to kill a thread on a
>>Unix platform, but not as easy with Windows (which, unfortunately I
>>use almost exclusively).
>It's about equally easy on either platform.  However, it's also
>basically unreliable on both platforms.  What happens if the killed
>thread held a mutex, for example?
>>...maybe once *most* users are up to at least python version 2.6 (I'm
>>I wonder if the threadpool in adbapi could be replaced with
>>> From the multiprocessing package.  I would think it would be easier
>>just kill and restart dead connections then.
>Twisted actually has good support for running child processes already,
>so we don't have to wait for Python 2.6, if this is a direction that's
>Perhaps something based on Ampoule would make sense?  It could be an
>compatible replacement for twisted.enterprise.adbapi, but use child
>instead of threads, and add one new method for interrupting outstanding

I've never looked at Ampoule, but I like the idea and wouldn't mind 
investigating the API compatible replacement idea (...not promising 


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