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https://issues.apache.org/jira/browse/FELIX-285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12497174
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Richard S. Hall commented on FELIX-285:
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One thing I was thinking about with respect to this patch was that issue (2)
listed above now changes the resolver so that it always performs an update if
one is possible, correct? Ultimately, this is a policy decision that does not
minimize the amount of work that OBR performs. In the old version of the
algorithm, the algorithm minimized the work that it performed and it took a
conscious decision to perform an update (unless dependencies could not be
satisfied with local resources). I am not sure which is the best approach in
this scenario.
> Make resolver more robust
> -------------------------
>
> Key: FELIX-285
> URL: https://issues.apache.org/jira/browse/FELIX-285
> Project: Felix
> Issue Type: Improvement
> Components: Bundle Repository (OBR)
> Affects Versions: 1.0.0
> Reporter: Bart Elen
> Assigned To: Richard S. Hall
> Fix For: 1.0.0
>
> Attachments: ResolverImpl.java
>
>
> There are two issues with the resolver of the current OBR implementation:
> 1) It does not try each possible composition
> Suppose we want to install bundle A, and A has a requirement which can be
> fulfilled by bundle B or C. B itself has a requirement which can be fulfilled
> by bundle X and bundle C has a requirement which can be fulfilled by bundle Y.
> A-B-X
> A-C-Y
> Suppose now that bundle X is not available (or can not be installed on the
> local platform)
> A-B-
> A-C-Y
> composition A-C-Y is now a correct composition, but the current
> implementation will notice that bundle B can not be resolved and will then
> stop. OBR will not always detect the correct composition.
> 2) Bundles are not always updated
> Suppose we want to install bundle A which has a requirement which can be
> fulfilled by bundle B.
> A-B
> An old version of bundle B is already locally installed on the platform but a
> newer version is available on the repository server. The current OBR
> implementation will detect that the requirement of A can be met by the
> locally installed old version of B and it will not check for a newer version
> on the repository server.
> I attached a fixed version of ResolverImpl.java in which the described issues
> are fixed.
> This is my first issue submit ever. Feedback to make it better is appreciated.
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