[jira] [Created] (FELIX-4116) Ability to listen for component service dependencies, providings, configuration properties, ...

["Pierre Bourret (JIRA)" <ji...@apache.org>]

Pierre Bourret created FELIX-4116:
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             Summary: Ability to listen for component service dependencies, providings, configuration properties, ...
                 Key: FELIX-4116
                 URL: https://issues.apache.org/jira/browse/FELIX-4116
             Project: Felix
          Issue Type: New Feature
          Components: iPOJO
         Environment: N/A
            Reporter: Pierre Bourret


iPOJO offers the ability to be notified when a service arrives/is modified/leaves a dependency. However this notifications happens _inside_ the component, via dependency callbacks (@Bind, @Unbind, @Modified).

What would be cool is to listen to this events _externally_, with listeners on the DependencyModel.
Is is possible right now to do this with a hack of the DependencyCallbacks (lots of reflection, ugly code).
So what just lacks is the API to register/unregister listeners + the listener interface.

Same thing for service providings : we should be able to be notified when a component start/stop to provide a service. It is possible to listen to all services with the good "instance.name", but this is not really elegant, and there might be issues with isolated ServiceContext (composite). Registering a listener on the ProvidedService seems a better approach IMO.

Same point for configuration, like the @Updated callback, but external.

For sure there are lots of other component things to listen to... ;)

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