Hi everybody,
I found an issue with layer groups containing other layer groups.
Shortly it can happen (and for the Murphy law, it usually happens) that
when loading the catalog a layer group containing other layer groups is
loaded before the referenced ones and this doesn't allow the correct layer
group initialization.
To avoid I thought to introduce some form of late binding for internal
layer groups that cannot be found when needed.
Shortly, during the loading phase, when a referenced layergroup is not
found some kind of placeholder is registered instead of the real
layergroup. When the loading phase is finished, the catalog is inspected
and the placeholders are replaced by the (now loaded) layer groups.
The same infrastructure could be reused in the future for other type of
catalog objects referencing objects of the same type.
Do you like this approach?
The alternative would be to try to load layergroups in the correct order,
but this would require a two phase approach also (during the first phase we
need to build a tree of layergroup dependencies and on the second load
groups using the ordered tree). I think this would be more complex to
implement.
I already have a patch for the first approach, so let me know if it's ok
and I will create a pull request.
Mauro
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Dott. Mauro Bartolomeoli
@mauro_bart
Senior Software Engineer
GeoSolutions S.A.S.
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55054 Massarosa (LU)
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http://www.geo-solutions.it
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