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From "Felix Meschberger (JIRA)" <j...@apache.org>
Subject [jira] Created: (FELIX-1413) Newly registered services must not immediately bound for static references
Date Tue, 28 Jul 2009 07:21:14 GMT
Newly registered services must not immediately bound for static references
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                 Key: FELIX-1413
                 URL: https://issues.apache.org/jira/browse/FELIX-1413
             Project: Felix
          Issue Type: Bug
          Components: Declarative Services (SCR), Specification compliance
    Affects Versions: scr-1.0.8
            Reporter: Felix Meschberger
            Assignee: Felix Meschberger
             Fix For: scr-1.2.0


Consider a static component references with mulitplie cardinality, that is 0..n or 1..n.

If the component is satisified and active, all services existing at the time of activation
are bound. If now a service is registered matching the component's reference this newly registered
service must not be bound to the component.

Only if the component is reactivated for another reason (e.g. reconfiguration or removal of
a statically bound service) may the newly registered service be bound. This is comparable
to optional package imports: such imports are only wired to newly installed bundles when the
importing bundle is explicitly rewired.

In other words here is what may happen :

   (1) Component C is enabled, satisfied and activated. All services bound. C has static,
multiple reference to Service type TS
   (2) Service S of type TS is registered
   (3) The service is *not* bound
   (4) Component C is deactivated (e.g. for reconfiguration)
   (5) Component C is still satisifed and activated. Now Service S is bound
   
In current versions (1.0.8 and earlier) scr is immediately reactivating the component to bind
the new Service S in step 3; which is wrong.

See also the discussion on the OSGi dev list "Questions on DS Spec" [1] for full details.

[1] http://www.mail-archive.com/osgi-dev@mail.osgi.org/msg00883.html

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