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https://issues.apache.org/jira/browse/FELIX-5045?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on FELIX-5045 started by Pierre De Rop.
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> DM Optional callbacks may sometimes be invoked before start callback
> --------------------------------------------------------------------
>
> Key: FELIX-5045
> URL: https://issues.apache.org/jira/browse/FELIX-5045
> Project: Felix
> Issue Type: Bug
> Components: Dependency Manager
> Affects Versions: org.apache.felix.dependencymanager-r5
> Reporter: Pierre De Rop
> Assignee: Pierre De Rop
> Fix For: org.apache.felix.dependencymanager-r6
>
>
> We just found a corner case that triggers optional dependency callbacks
> before the component is invoked in its 'start' lifecycel callback. This is a
> bug, because in DM, optional dependency callbacks should be always invoked
> after the component's 'start' lifecycle callback.
> I'm describing now the use case: we have the following component players:
> - B: a simple service component.
> - BFactory: a service that has a 'create' method which registers in the OSGi
> registry a new B service instance.
> - A: a component that adds from A.init() lifecycle callback a required
> dependency (with a callback) on BFactory, as well as an optional dependency
> (with a callback) on B.
> - when A.bind(BFactory factory) is called, it then calls "factory.create()"
> method which triggers the registration of the B Service. At this point,
> A.bind(B b) is then invoked, but the A.start() lifecycle callback has not yet
> been called. This is because we are currently transiting from
> INSTANTIATED_AND_WAITING_FOR_REQUIRED -> TRACKING_OPTIONAL; so the current
> state is TRACKING_OPTIONAL, and we are calling the
> invokeAddRequiredInstanceBoundDependencies()
> method, which calls A.bind(BFactory) method, which synchronously registers a
> B service instance; so this ends up calling the handleAdded method, which
> invoke A.bind(B b) method, but at this point we have not yet called the
> A.start() callback.
> - then "A.start()" is called.
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