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

[Dylan Jay]

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.



> "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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