Provide runtime symbol source

[Achim Huegen]

I have some problems while trying to provide the init-params of the 
HivemindFilter servlet as symbols to the hivemind registry.
I don't want to use SystemPropertiesSymbolSource.

My plan was to add a custom implementation of ModuleDescriptorProvider
and add an instance to RegistryBuilder via addModuleDescriptorProvider.
That provider should return a custom implementation of ModuleDescriptor, 
which finally returns a contribution to ApplicationDefaults in
getContributions.

Then I learned that all the descriptor classes (ContributionDescriptor,
ImplementationDescriptor) are quite xml centric. I (naively) hoped to be 
able to use instances of FactoryDefault or SymbolSourceContribution 
directly. But the descriptors work with hierarchic elements and 
attributes, the data is in a rather "raw" and untyped format.

So, is there a way to provide already constructed 
instances/services/contributions to the RegistryBuilder?

Is there another way to solve this problem without ModuleDescriptors?
Thanks
Achim Huegen



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