I have put an enhancement proposal at
http://www.zope.org/Wikis/ZODB/VolatileAttributeLifetimeGarantee
It allows applications to declare that they need for
some (so called sticky) objects a garanteed lifetime for their
volatile attributes that extends until at least the next
transaction boundary.
This extension makes safe the use of volatile attributes for
the following cases:
* the storage of database connections in "Shared.DC.ZRDB.Connection"
* the former use of "_v_skindata" in "Products.CMFCore.Skinnable"
(now replaced by a much more complex, less efficient and not
completely correct solution)
* the use of "_v_is_cp" in "Archetypes.BaseObject"
(and other use of volatile attributes for control purposes).
This statement implies that the current use is unsafe.
Feedback is welcome -- either in the Wiki or here.
--
Dieter
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