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From Thomas Watson <tjwat...@us.ibm.com>
Subject Re: SpringSource Bundle Repository
Date Tue, 06 May 2008 14:04:41 GMT
Glyn Normington <glyn.normington@gmail.com> wrote on 05/06/2008 08:04:28
> The Platform rewrites the manifests of the bundles of an application
> (i.e. a PAR file) to use mandatory matching attributes to form a
> scope. For example the following bundle of an application called
> "MyApp" version 1.0:
> Manifest-Version: 1.0
> Bundle-Name: MyBundle
> Bundle-ManifestVersion: 2
> Bundle-SymbolicName: MyBundle
> Export-Package: my.package.p
> Bundle-Version: 1
> is scoped to:
> Manifest-Version: 1.0
> Bundle-Name: MyBundle
> Platform-Scope: MyApp-1
> Bundle-ManifestVersion: 2
> Bundle-SymbolicName: MyApp-1-MyBundle
> Export-Package:
> my.package.p;platform_scope="MyApp-1";mandatory:="platform_scope"
> Bundle-Version: 1

Is Platform-Scope simply syntactic sugar for a matching attributes and
mandatory directives?  Does Import-Bundle allow for matching attributes
so you can get access to packages with mandatory directives?  What
about Import-Library, how does this all map to the transitive bundles
included in a library?

> import-library is converted into package imports during manifest
> rewriting, so you get the clean semantics of import-package with none
> of the semantic rough edges of require-bundle.

What happens when you use Import-Bundle on more than one bundle that
exports the same package?  This would be the typical "split" package
case with Require-Bundle.  I assume the first one listed wins since
the framework does not allow a bundle to import the same package more
than once with Import-Package.

What about if you use Import-Bundle on another bundle that uses
Require-Bundle with visibility:=reexport?  Do you also import
all the packages exported by the Required Bundle?

I am also interested in some implementation details on how you
do the manifest rewriting (perhaps this can be taken off line
but I will ask here to start).  I assume you are using the Equinox
adaptor hooks to transform the bundle manifests on bundle installation.
I am wandering what you do for cases where Import-Bundle refers to
a bundle that is not yet installed.  Do you rewrite the manifest again
once the imported bundle is installed?  I am asking because the Equinox
AspectJ incubator project does similar things and they had to work
through some issues to make sure the updates happened reliably.

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