[hibernate-dev] EMF / EM properties

[Steve Ebersole]

On Mon, 2010-01-25 at 10:12 +0100, Emmanuel Bernard wrote:

> This approach probably works fine for EM but EMF's settings have to be read at configuration time as they influence each other in a non trivial way. They are basically part of the state machine used to retrieve the list of mappings (ann or xml), some of the key configurations (JTA vs non JTA which influences how the datasource is provided etc). We would need to read these setting at least two times:
>  - once at Configuration time
>  - once at SF creation time

Ok, I am seeing this now... and it is causing me some problems (or at
least questions about) reporting back EMF properties.  It's very similar
to the way SessionFactory is built.  Most of the properties are actually
"consumed" during SettingsFactory processing.  So the SessionFactory has
access to both the Settings (consumed properties) and the raw Properties
object from Configuration.  In the first case it would need to know how
to extract off all the relevant configuration parameters; in the latter
case it would need to know which to exclude (this Properties holds
*everything*, even System properties generally).

The problem with the "unroll Settings" approach is that we'd have to go
pretty far down to get them all.  

-- 
Steve Ebersole <steve at hibernate.org>
Hibernate.org