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https://issues.apache.org/jira/browse/FELIX-3377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269138#comment-13269138
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David Jencks commented on FELIX-3377:
-------------------------------------
I prefer returning the activate/whatever method result in a method object, but
I think that we need to distinguish between a method whose return type is
Dictionary but returns null (I think this means that the service properties
should be reset to the base properties + config admin properties) and a method
whose return type is void (meaning don't do anything to service properties).
Also, I can't see any reason the bind/unbind and updated methods (and
deactivate) shouldn't be able to affect the service properties in the same way.
I'll work on a new patch soon unless you beat me to it :-)
> 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-3377-3.diff, FELIX-3377-4.diff,
> FELIX-3377-returnDictionary.patch, 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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