[ZODB-Dev] Decouple persistence, database, and cache

[Dmitry Vasiliev]

Jim Fulton wrote:
> I've created a proposal:
> 
>   http://www.zope.org/Wikis/ZODB/DecouplePersistenceDatabaseAndCache
> 
> for simplifying and decoupling the persistence and cache architectures.
> I've been thinking about this for quite some time.  In fact, the ability 
> to subclass
> weakref.ref objects that appeared in Python 2.4 anticipates this. :)

I like the proposal but I don't understand some details:

  - Why do you want to use '__setitem__' method instead of for example 
'notify'? Is it only for "make this go fast"?
  - Why are such values selected for the state constants (persistent.GhostState 
= None, persistent.ChangedState = True, persistent.SavedState = False, 
persistent.ReadState = False)?

-- 
Dmitry Vasiliev (dima at hlabs.spb.ru)
     http://hlabs.spb.ru