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

[Jim Fulton]

On Aug 23, 2007, at 1:53 AM, Christian Zagrodnick wrote:

> 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?

I don't know what you mean.  I ran my example interactively.  What  
happens when you run my example interactively?

Jim

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