RE: OSGi (Blueprint) fragment and host bundle notification

[Timothy Ward]

Hi,

>From the original question I would say "No, there is no way for a host bundle 
>to receive a notification when a fragment attaches". Fragments only attach at 
>resolution time, therefore the host bundle can never see the attachment 
>because it is, by definition, not resolved yet!

What you can do is the following at startup (On OSGi 4.3):

  public void start(BundleContext ctx) throws BundleException {
    
    Bundle hostBundle = ctx.getBundle();
    
    BundleWiring wiring = hostBundle.adapt(BundleWiring.class);
    
    Collection<BundleWire> fragmentWires = wiring.
               getProvidedWires(BundleRevision.HOST_NAMESPACE);
    
    for(BundleWire wire : fragmentWires) {
      Bundle fragment = wire.getRequirerWiring().getBundle();
      //Do some stuff with this fragment
    }
  }

This will allow you to find out which fragments were wired to your bundle when 
it resolved.

Regards,

Tim

From: mnutt...@apache.org
Date: Wed, 7 Sep 2011 08:54:57 +0100
Subject: Re: OSGi (Blueprint) fragment and host bundle notification
To: user@aries.apache.org

Hi Matt, A web search for "osgi bundle tracker fragment" yields this article: 
http://java.dzone.com/articles/osgi-junit-test-extender-using. This uses a 
BundleTrackerCustomizer, 




bundleTracker = new BundleTracker(context, Bundle.RESOLVED, testExtender);

bundleTracker.open();


Which then tests to see if it's been given a fragment:
String fragment = 
bundle.getHeaders().get(org.osgi.framework.Constants.FRAGMENT_HOST) + "";


> Thanks in advance!
You're welcome!
Regards, Mark

On 6 September 2011 23:14, Matt Madhavan <mattmadha...@gmail.com> wrote:


Hello,I would like to know when a new BluePrint fragment attaches it self to a 
host bundle will the host bundle be notified? I would like to do some work 
inside of the host bundle anytime a fragment attaches itself to a host.



Any ideas?
Thanks in advance!Matt Madhavan