I have to admit I haven't read thru all of this thread, so my answer
might be to something else... But here we go:
I think we actually do something very similar to this in our system,
we automatically detach any instances of jpa-enitities (replacing them
with a surrogate with only the class and id) and then get them again
from the db-cache if the page is reconstructed again. So far it works
like a charm and the programming model is very convinient. Just dump
whatever entity you like as member of a component and it is
automatically detached and then loaded back when needed.
I implemented this by hooking in to serialization, just checking each
object in ObjectOutputStream.replaceObject and
ObjectInputStream.resolveObject. Also had to use my own PageMapEntries
to get a suitable hook. Might work as an idea for your implementation
perhaps?
// Daniel
jalbum.net
On 2008-06-04, at 19:03, Eelco Hillenius wrote:
On Wed, Jun 4, 2008 at 9:43 AM, Igor Vaynberg
<[EMAIL PROTECTED]> wrote:
you still have ondetach()...but for convinience we can automatically
detach any imodel fields, i actually wanted to do this for a while...
I tried to write this two days ago, but wasn't able to pull it off...
I wrote an instantiation listener that introspected on the fields of
components and replaced IModel members with a proxy. These proxies
would register themselves with the request cycle for cleaning up
whenever the getObject was called, and the request cycle then would go
through the list of registered models and detach them at the end of
the request. The problem I ran into however is that these members can
be final, assigned at a later stage (typically are actually) and such.
But if there is some way to automatically detach model members, we
could get rid of the model member in component and instead just let
components have models by default where it actually always makes
sense, such as form components.
Anyway, that's something for 1.5. If it is fixable, I think that would
be the way out of the generics controversy :-)
Eelco
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