[Zope3-dev] Re: using utilities/sites from threads in zope3

[Jim Fulton]

What Tres said. :)

Jim

On Jun 29, 2007, at 8:54 AM, Tres Seaver wrote:

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> Tim Stebbing wrote:
>> G'day,
>>
>> I've recently ran into a bit of a problem attempting to use  
>> threads in
>> zope 3.2.1, hooks.getSite() returns None, and any attempt to get a
>> utility results in a component lookup error within my threads.
>>
>> I've attempted to pass a site into a thread and set it with
>> hooks.setSite() but this is apparently not the way to go, I get the
>> feeling that a thread that needs access to things form the database
>> probably needs its own connection, context etc.
>
> Your worker thread almost certainly needs its own database
> connection(s):  applicaiton code typically relies on the isolation
> provided by connection-per-thread, which means that it is not  
> "safe" in
> general to share persistent objects between threads.
>
> Assuming that you do grab a connection and get its root object, you
> should then be able to traverse to your friendly local site manager,
> calling 'setSite' at *each* parent site manager you pass along the  
> way.
>
>> I'm aware of ITask's but unsure if developers are supposed to use  
>> them
>> for their own purposes? Do these handle setting up of contexts like
>> db, site, global utils etc? I've googled around a fair bit and been
>> over all the z3 doco, it would be great if there was a simple  
>> howto on
>> setting up a thread that would have the usual access to various
>> components.
>
>
> Tres.
> - --
> ===================================================================
> Tres Seaver          +1 540-429-0999          tseaver at palladion.com
> Palladion Software   "Excellence by Design"    http://palladion.com
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