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https://issues.apache.org/jira/browse/FELIX-4493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard S. Hall updated FELIX-4493:
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Fix Version/s: resolver-1.2.0
> Allow ResolveContext to supply on demand resources
> --------------------------------------------------
>
> Key: FELIX-4493
> URL: https://issues.apache.org/jira/browse/FELIX-4493
> Project: Felix
> Issue Type: Improvement
> Components: Resolver
> Affects Versions: resolver-1.0.0
> Reporter: Thomas Watson
> Fix For: resolver-1.2.0
>
> Attachments: org.apache.felix.resolver.patch
>
>
> We have been discussing two approaches to using the resolver
> 1) Big bang resolve. This is where the client wants to attempt to resolve
> all currently unresolved resources in one go. Here the ResolveContext could
> return all the unresolved resources as optional resources. This makes
> fragment resolution more simple because the resolver is supplied the complete
> set of unresolved resources from the start. But it still has a drawback of
> not allowing an already resolved fragment to be attached to another host
> since there is no mechanism to pull in the already resolved fragment when
> resolving another potential host.
> 2) Single root resolve. Here the client wants to attempt to resolve each
> "root" resource individually. As we are populating the "root" resource
> additional resources get pulled in as they supply candidates for the
> requirements that need to be resolved. This approach also suffers from a
> similar fragment issue since fragments will not get automatically pulled into
> a resolve operation unless they are either the root resource or they provide
> a candidate capability needed to resolve some other requirement.
> It would be useful if the ResolveContext could provide additional "on demand"
> resources that get pulled in as other resources are getting automatically
> pulled into the populate candidate phase.
> I suggest we add a felix specific ResolveContext interface that can be
> optionally implemented in order to provide a method
> getOndemandResources(Resource host). This method would get called by the
> resolver as it pulls in resources during the populate candidates phase.
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