In order to do that you would have to track capabilities by using the system.bundle context in order to see capabilities being provided by the individual bundles within the scoped subsystems being installed by using something like a BundleTracker. Then you would have to figure out which subsystem the bundle belonged to and determine which capabilities that subsystem exports with its own sharing policy headers (Provide-Capability, Export-Capability etc). I'm not sure this makes any sense with your scenario.
For the extender pattern is far better to act upon the individual bundles within the subsystem by looking at their capabilities/requirements (or some other meta-data like DS component XML) and using their BundleContext to get a properly scoped view of the world according to the subsystem they are installed in. For example, this is how a single blueprint or DS implementation can work across all bundles contained in various scoped subsystems. They track bundles using the system.bundle context, but they consume/register services on behalf of the extendee bundle by using the extendee bundle's context.
Tom
----- Original message -----
From: Cristiano Gavião <cvgav...@gmail.com>
Sent by: osgi-dev-boun...@mail.osgi.org
To: osgi-dev@mail.osgi.org
Cc:
Subject: Re: [osgi-dev] How to get the custom capabilities provided by a scoped subsystem ?
Date: Wed, May 17, 2017 7:58 AM
Hummm... :-\
I was about to create a kind of extender provider tracking on the subsystem capabilities... will need to rethink it then...
thanks BJ.
On 16/05/2017 22:09, BJ Hargrave wrote:I doubt it. The region bundles don't provide or require the capabilities themselves.You will probably need to use the subsystem service to get the subsystem manifest and parse the headers yourself.--
BJ Hargrave
Senior Technical Staff Member, IBM // office: +1 386 848 1781
OSGi Fellow and CTO of the OSGi Alliance // mobile: +1 386 848 3788
hargr...@us.ibm.com----- Original message -----
From: Cristiano Gavião <cvgav...@gmail.com>
Sent by: osgi-dev-boun...@mail.osgi.org
To: OSGi Developer Mail List <osgi-dev@mail.osgi.org>
Cc:
Subject: [osgi-dev] How to get the custom capabilities provided by a scoped subsystem ?
Date: Tue, May 16, 2017 4:46 PM
Hello OSGi experts,
In a subsystem manifest we can declare provided capabilities using the
header "Provide-Capability:".
I'm trying to get them using the bundle context from the subsystem
service (injected by DS):
> List<Capability> caps = pScopeSubsystem.getBundleContext()
> .getBundle().adapt(BundleRevision.class)
> .getCapabilities(null);
> for (Capability capability : caps) {
> System.out.println("Cap: " + capability.toString());
> }
Also tried BundleWiring:
> BundleWiring bw = pKernelSubsystem.getBundleContext().getBundle()
> .adapt(BundleWiring.class);
> List<BundleCapability> capabilities = bw.getCapabilities(null);
But the only capabilities that I was able to get are those:
> Cap: osgi.wiring.bundle; bundle-version:Version="1.0.0";
> osgi.wiring.bundle="org.osgi.service.subsystem.region.context.1"
> Cap: osgi.wiring.host; bundle-version:Version="1.0.0";
> osgi.wiring.host="org.osgi.service.subsystem.region.context.1"
> Cap: osgi.identity;
> osgi.identity="org.osgi.service.subsystem.region.context.1";
> type="osgi.bundle"; version:Version="1.0.0"
So, what is the way to get the custom capabilities declared for a scope
subsystem?
many thanks,
Cristiano
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