IRC log of #zope3-dev for Friday, 2009-02-20

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goschtlHi is it possible to get a custom principal instead the default one in principalfolder.Principal?12:59
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imgreyhi #zope3-dev13:46
imgreysay I want object to save itself in zodb when garbage collector tries to collect it.13:46
imgreyis it possible ?13:47
zagyimgrey: I don't know but I think you're doing something which you should not13:58
imgreyzagy, like overloading __del__ method ?13:58
zagyimgrey: read about __del__ and gc first  (see the gc module)13:59
zagyin short: you don't want to use __dell__ at all14:00
imgreyzagy, I know that it is not a very good idea to use __del__14:00
zagywhy don't you just put your objects to the zodb?14:00
imgreybut maybe I can use gc to check references and then store object in db at some point in time14:01
imgreyzagy, I want object to store itself in db14:01
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zagyyou object is certainly referenced by another object isn't it?14:02
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imgreyzagy, yes14:40
imgreywith weak refference14:40
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mgedmincan you persist weakrefs?14:43
mgedminwait, zodb has some kind of PersistentWeakReference, no?14:43
imgreyseems yes14:43
mgedminimgrey: what problem are you trying to solve with these unconventional techiques?14:43
imgreyI'm using twisted. reactor serves user requests. At ant point in time object may be created or requested. I want objects to be stored in memory and drop them to db only when they're not necessary anymore14:45
imgreyin order to decrease the load14:45
mgedmindo you use threads?14:45
imgreyand because only one connection at a time is possible to zodb. as data is a tree14:46
imgreyand this tree may not be modified my multiple processes14:46
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imgreymgedmin, yes14:49
imgreysorry14:49
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imgreycannot understand how to automate storing objects to db if __del__ is prohibited14:51
zagyimgrey: objects are automatically stored whenever you reference them from an object which is already in the database14:52
imgreyzagy, what reference I shall use strong or weak ?14:53
zagystrong14:53
zagyobjects are automatically removed from memory a times14:54
zagys/a times/at times/14:54
mgedminimgrey: different threads have separate ZODB caches, you cannot access the same object from different threads if you do not store it14:54
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