Yeah, as he explained that is complicated by the fact that
GeoServerDataDirectory and GeoServerResourceLoader are also resource
store, but never "the" resource store (in fact, they depend upon it).
Solution #1
Use of a Spring "alias". An alias as higher priority than a normal name.
However that only gives two levels of priority, once you have more than
one alias you end up with the same issue. This may be sufficient for us
though, assuming that we'd never need more than one custom ResourceStore
in our context.
Solution #2
The pattern we used for geofence/geofence-server: using
PropertyConfigurers we have full flexibility over priority. It would go
something like this. In main applicationContext:
<bean id="resourcestore-configurer"
class="org.geoserver.config.GeoServerPropertyConfigurer">
|*<property name="order" value="5"/>*
<property name="properties">
<props>
<prop key="theResourceStore">dataDirectoryResourceStore</prop>
</props>
</property>
</bean>
<bean id="resourceStore"
class="org.geoserver.platform.resource.ResourceStoreProxy">
<property name="delegate" ref="$theResourceStore"/>
</bean>
Then in the jdbcstore applicationContext:
<bean id="resourcestore-configurer"
class="org.geoserver.config.GeoServerPropertyConfigurer">
*<property name="order" value="4"/>*
<property name="properties">
<props>
<prop key="theResourceStore">jdbcResourceStore</prop>
</props>
</property>
</bean>
Quite an elegant solution, if you ask me.
Kind Regards
Niels
On 16-02-16 09:27, Andrea Aime wrote:
On Tue, Feb 16, 2016 at 2:31 AM, Jody Garnett <[email protected]
<mailto:[email protected]>> wrote:
Anyone have any thoughts? Is there something more basic I'm
missing?
The auto migration from file to jdbc makes this more complicated
then strictly necessary. If not for this feature we could make a
war that only had the JDBCResourceStore implementation.
Does spring have a priority we could use to control extensions? Or
we could bust out a -D command line option (to tell the proxy what
to use? - with the default being the file based implementation).
I'm not aware of a bean priority that can be use for override in Spring.
The existing approach in all GeoServer for this cases is to have a
default implementation created programmatically unless
a different one can be found using a scan of the application context.
See how the ResourceAccessManager is looked up in SecureCatalogImpl,
or check how the catalog facade is setup with jdbc config
(the two approaches are different, both vaild).
Cheers
Andrea
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