[Zope] Re: UnpickleableError: Cannot pickle<type'thread.lock'>objects

[Dylan Jay]

"Dylan Jay" <gmane at dylanjay.com> wrote in message 
news:d8ogk5$27c$1 at sea.gmane.org...
>I think I've tracked it down to a RamCacheManager inside a volitile 
>variable. But I thought volitile variables we'ren't stored? Am I doing 
>something strange with my heirachy that is abusing the ZODB? The heirachy 
>is
> object.<Map>[Cacheable] And the Cacheable has _v_ZCacheable_cache = 
> RamCacheManager. I believe the RamCacheManager has locks in it.

I think I've tracked down the problem. Cacheable did not inherit from 
Persistent. I was infact using a super class of Cacheable called 
NamedCacheable which inherited Acquisition.Implicit which I'd thought was 
enough (a long time ago when I wrote it).

Just for the record, how I tracked this down was by using dumps. In pdb I 
did

from pickle import dumps
pp state['attributename']

until I found the parts of the state that raised errors.

>
>
>> "Dieter Maurer" <dieter at handshake.de> wrote in message 
>> news:17071.4574.893818.528219 at gargle.gargle.HOWL...
>>> Dylan Jay wrote at 2005-6-14 17:45 +1000:
>>>> ...
>>>>356, in _commit_objects
>>>>    jar.commit(o, self)
>>>>  File "C:\Program 
>>>> Files\Zope-2.7.5-final\lib\python\ZODB\Connection.py",
>>>>line 4
>>>>52, in commit
>>>>    dump(state)
>>>>UnpickleableError: Cannot pickle <type 'thread.lock'> objects
>>>
>>> I would catch the error and enter a debugger to analyse the "o" above.
>>>
>>> With "pdb" (the Python Debugger, part of Python),
>>> this could look like:
>>>
>>>     try: dump(state)
>>>     except: import pdb; pdb.set_trace()
>>
>> Good suggestion (I did try to get debugging working in WingIDE and Boa 
>> but your way worked best in the end).
>> Unfortunatly I'm still none the wiser.
>> I know which object it is and I've looked at its state (below). I've 
>> looked at the OOBTree and made sure it contains nothing that has a lock 
>> in it. I can look at sys.exc_info[1].args which is a lock object but what 
>> I really need to do is work out where this lock object is and why its 
>> entangled with my transaction. Any suggestions?
>>
>> {'__ac_local_roles__': {'djay': ['Owner']},
>> '_cacheables': {'constructReviewer': <NamedCacheable instance at 
>> 0409A8D0>,
>>                 'findNeighbors': <NamedCacheable instance at 0409A8C0>},
>> '_hasBeenTrained': 0,
>> 'filterByMovies': 0,
>> 'filterByPeople': 0,
>> 'filterByVotes': 0,
>> 'hashMoviesToUse': None,
>> 'hashPeopleToUse': None,
>> 'hoods': <OOBTree object at 0x041B5368>,
>> 'id': 'predictor',
>> 'keepInMemory': 0,
>> 'moviesToUse': None,
>> 'neighborhoodSize': 30,
>> 'overlapPenalty': 50,
>> 'peopleToUse': None,
>> 'reviewers': None,
>> 'title': '',
>> 'votesToUse': None}
>>
>>
>>
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>
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