> >Gemstone/J provides the ability to persist objects directly in the
> >application server via what we call the Persistent Cache
> Architecture(PCA).
>
> But I get this service for less money via WebLogic. It supports
> transparent, transactional, serialized persistence of entities
> and the object graphs they root.
Not quite.
You really DO get what you're paying for here. Persistence's PowerTier and
Gemstone/J have some *enormous* time-to-market and performance benefits over
WebLogic or IBM WebSphere. Both are effectively Object Database management
systems embedded inside an application server. Having transactional cache
on the middle tiers of your N-Tier system can speed things up tremendously
(and make life easier in general).
Of course, YMMV - they are lacking in some areas (web integration and legacy
integration), though this is changing quickly. And needless to say, it's a
lot easier to integrate web functionality than it is to integrate an ODBMS.
Everyone seems to be moving to the "cache in the middle" architcture:
Apple's WebObjects takes a similar (though non-EJB) approach with its
Enterprise Object Framework (EOF). Microsoft's COM+ will also be taking a
similar approach with thier IMDB (in-memory database). And even WebLogic
*is* supposedly integrating ObjectStore some day.
Stu Charlton
Distributed Systems Developer, Nuvation Labs
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