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https://issues.apache.org/jira/browse/FELIX-4831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14367577#comment-14367577
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David Jencks commented on FELIX-4831:
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Please look at bnd, it is totally implausible to implement this stuff anywhere
else. Looking at master, it already has very elegant @ProvideCapability and
@RequireCapability annotations. I still don't think annotations are an
appropriate solution for this kind of problem. For instance, an extender is
typically going to export some services and therefore there should be a bnd
plugin for it that identifies those services from the existing information that
the extender uses to identify what its' going to export and add
provide-capability headers for the exported services. This bnd plugin can also
add the extender requirement at the same time. Making someone use annotations
that basically duplicate what the extender is looking for is too hard for the
user.
> Simplify the declaration of capabilities
> ----------------------------------------
>
> Key: FELIX-4831
> URL: https://issues.apache.org/jira/browse/FELIX-4831
> Project: Felix
> Issue Type: Improvement
> Components: Maven Bundle Plugin
> Affects Versions: maven-bundle-plugin-2.5.3
> Reporter: Florian Brunner
>
> Declaring capabilities is currently rather cryptic. It requires a specific
> syntax, which I believe is hard to remember for non-OSGi experts.
> E.g. to provide a CDI extension using PAX-CDI you would need something like
> this:
> <Provide-Capability>
> org.ops4j.pax.cdi.extension;
> extension=my-extension
> </Provide-Capability>
> To require the CDI extension you would need something like this:
> <instructions>
> <Require-Capability>
> osgi.extender; filter:="(osgi.extender=pax.cdi)",
> org.ops4j.pax.cdi.extension; filter:="(extension=my-extension)"
> </Require-Capability>
> </instructions>
> The proposed solutions consists of 3 parts:
> - a new property for the bundle goal of the Maven Bundle Plugin:
> instructionsFile
> This property defines a properties file containing additional BND
> instructions to take into consideration when executing the goal
> - a annotation library, which provides annotations for declaring BND
> instructions
> - a custom annotation processor, which generates the instructionsFile from
> the annotations
> This approach would:
> - guide the developer what to specify
> - doesn't require the developer to know the exact syntax
> - helps avoiding typos
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