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service.ranking and ServiceTracker [message #97162]

Wed, 12 September 2007 03:58

Eclipse User

I register 2 services into the OSGi runtime.
These services implement the interface IFoo.

I set the service.ranking of one of the services to be higher
than its counterpart.

Service #1: service.ranking=200
Service #2: service.ranking=1

When I start a ServiceTracker, will addingService(..) be called with Service #2 first ? This is not mentioned in the compendium spec. Thanks.

Regards,

Gavin Bong

Re: service.ranking and ServiceTracker [message #97192 is a reply to message #97162]

Wed, 12 September 2007 05:54

Eclipse User

I just read the javadoc. The service.ranking property is only useful to the method BundleContext.getServiceReference(..). So to answer my own question above: NO.

Re: service.ranking and ServiceTracker [message #97755 is a reply to message #97192]

Wed, 19 September 2007 17:17

Eclipse User

Gavin Bong wrote:
> I just read the javadoc. The service.ranking property is only useful to the method BundleContext.getServiceReference(..). So to answer my own question above: NO.

The ServiceTracker.getService() should still return the highest ranking
service available. But the addingService(..) is called in the order in
which the services are actually registered. This is because the service
registration events are synchronous and cannot really be queued up
correctly to get a proper ranking order. This would cause all kinds of
timing issues.

HTH.

Tom

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