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From "Carsten Ziegeler (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SLING-8478) Adding method to match Requirements and Capabilities
Date Fri, 07 Jun 2019 16:18:00 GMT
Carsten Ziegeler created SLING-8478:
---------------------------------------

             Summary: Adding method to match Requirements and Capabilities
                 Key: SLING-8478
                 URL: https://issues.apache.org/jira/browse/SLING-8478
             Project: Sling
          Issue Type: Improvement
          Components: Feature Model
            Reporter: Carsten Ziegeler
            Assignee: Carsten Ziegeler
             Fix For: Feature Model 1.0.4, Feature Model IO 1.0.4


a feature can have requirements and capabilities, we use the OSGi interfaces for this. However,
there is currently no easy way to match requirements and capabilities as these interfaces
do not provide a method for it.

For example, if you want to know whether a requirement is met by the available capabilities,
that's not possible. While the OSGi specs provide a resolver that approach is way too heavy
and not really suited for simple use cases. The resolver is used by the framework for bundle
wiring.

Therefore I propose we add a simple interface like
MatchingRequirement extends Requirement {
   boolean match(Capability cap);
}

and this allows to match requirements and capabilities. As we're using Apache Felix utils
for our reqs/caps, this method is already available there, so we don't have to implement this
ourselves. Its just making it available 



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