It's a leftover from the days when GWC first needed GeoServer's WMS to
be ready to serve a getcapabilities document before GWC could initialize.
In theory it is still useful if you wanted to use GWC integrated in
GeoServer and connect to another instance running in the same servlet
container. I don't think very many people need that, and it was very
painful to write in the first place, so I'd be happy to get rid of it.
Are you trying to fix 2.1 or 2.0.x as well? Standalone GWC still needs
the code for as long as people use the getcapabilities configuration, I
(or Gabriel) would have to look into whether it can be toggled with a
flag. In the long run I want to get rid of that kind of dynamic
configuration anyway.
-Arne
On 10/4/10 6:50 PM, Justin Deoliveira wrote:
Hi all,
Currently the gwc module does its configuration in a separate thread.
This is problematic for dbconfig because during that configuration gwc
must access the catalog. The way session management is set up
currently is that it is thread local based. So this leads to issues.
Describing the issue a bit more... the way the hibernate dao is setup
is that its proxy will allow methods to be called on the catalog and
create a session on demand... howver that session is closed after the
method called. Which prevents any sort of lazy initialization. So what
we do on startup is create a thread local session and keep it around
until geoserver startup is complete. And so if gwc did its config in
the main startup thread there would be no issue... but since it does
not ... kaboom.
So... thoughts on this issue? It would be easy enough to patch the gwc
TileLayerDispatcher to load in the current thread... but i don't know
enough about gwc to know if that is a good idea.
-Justin
--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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