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https://issues.apache.org/jira/browse/FELIX-3377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13225019#comment-13225019
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Felix Meschberger commented on FELIX-3377:
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Thanks a lot for providing the patch.
I have applied it slightly modified in Rev. 1298275:
- Added some more JavaDoc to ExtComponentContext
- Have ExtComponentContext extend ComponentContext
- Internally tread property overwrites like supplied CM configuration
This allows for properly transient property modification instead
of overwriting the actual descriptor properties which would cause
the properties for all instances created from the same descriptor
to be subsequently modified.
Does this sound correct ?
> Allow a component to update its own service properties
> ------------------------------------------------------
>
> 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
> Attachments: FELIX-3377-2.diff, FELIX-3377.diff
>
>
> 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.
> This idea was originally suggested by Erin Schnabel in OSGI bug 2250.
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