[Zope3-dev] Re: Leak in zope.component?

[Christian Zagrodnick]

On 2007-08-22 16:12:42 +0200, Jim Fulton <jim at zope.com> said:

> 
> On Aug 22, 2007, at 8:16 AM, Christian Zagrodnick wrote:
> 
>> Hi,
>> 
>> I'm doing things wich z3c.zalchemy and trying to find out why my  
>> database connections are kept open  even after unregistering  
>> everything.
>> 
>> Given the following very simple test:
>> 
>>>>> import sys
>>>>> import zope.component
>>>>> import zope.interface
>>>>> class IUtil(zope.interface.Interface):
>> ...     pass
>> 
>>>>> gsm = zope.component.getGlobalSiteManager()
>>>>> utility = object()
>>>>> sys.getrefcount(utility)
>> 2
>>>>> gsm.registerUtility(utility, IUtil)
>>>>> sys.getrefcount(utility)
>> 6
>> 
>>>>> gsm.unregisterUtility(utility, IUtil)
>> True
>>>>> sys.getrefcount(utility)  # this fails
>> 2
>> 
>> ----------------------------------------------------------------------
>> File "/Users/zagy/development/z3c.zalchemy/src/z3c/zalchemy/tests/ 
>> dispose.txt", line 17, in dispose.txt
>> Failed example:
>>    sys.getrefcount(utility)  # this fails
>> Expected:
>>    2
>> Got:
>>    4
>> 
>> 
>> 
>> So there are now two more references than before register/ unregister. 
>> Am I missing something? Or is it leaking somewhere?
> 
> Here's what I get with the trunk of zope.component:
> 
> jim at ds9:~/p/zope/component/trunk$ bin/py
> 
>  >>> import sys, zope.component, zope.interface
>  >>> class IUtil(zope.interface.Interface): pass
> ...
>  >>> gsm = zope.component.getGlobalSiteManager()
>  >>> utility = object(); sys.getrefcount(utility)
> 2
>  >>> gsm.registerUtility(utility, IUtil); sys.getrefcount(utility)
> 5
>  >>> gsm.unregisterUtility(utility, IUtil); sys.getrefcount(utility)
> True
> 2
> 
> So I can't reproduce what you are seeing.
> 
> Try adding:
> 
>     >>> import gc; gc.collect()
> 
> before your last getrefcount call.

That doesn't change a thing. Could it be the testrunner having an eye 
on registrations?

-- 
Christian Zagrodnick

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