Allow a component to update its own service properties
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Key: FELIX-3377
URL: https://issues.apache.org/jira/browse/FELIX-3377
Project: Felix
Issue Type: Improvement
Components: Declarative Services (SCR)
Affects Versions: scr-1.6.0
Reporter: David Jencks
If you just register a service in code, you can give the ServiceRegistration to
the service and it can update its service properties to reflect what it can
discover about its environment. This proposes that services registered through
DS should be able to do this too, by calling an updateProperties(Dictionary)
method on the ComponentContext. (Since we'd need a spec update to add the
method to ComponentContext, I added a new interface that ComponentContextImpl
implements).
Right now a service could get Config Admin and modify the properties there, but
then (a) the update method is called even though the component itself initiated
the changes and (b) the new property values are persisted which is presumably
not desired.
According to the spec config admin properties override default property values
specified in the component xml. I think that in order to reduce confusion,
once a property has been set through config admin it should not be possible to
update it through this update method. This also makes implementing this idea
easy.
IIUC this idea does not make sense for component factories.
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