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Requesting to be started bundle list to virgo [message #1691994]

Sat, 11 April 2015 12:44

Eclipse User

Hello all,

I would like to know if there is a way to request the bundle list which will be started in the virgo startup phase in real time.

For example I've bundle a,b,c,d. After a is started, a wants to know which bundle will be started after it (so b,c,d at first call and then c,d and then nothing).

Is that possible ?

Thank you

Re: Requesting to be started bundle list to virgo [message #1692569 is a reply to message #1691994]

Thu, 16 April 2015 10:26

Eclipse User

Hi,

I don't want to let you down, but I'm not able to come up with a solution so far.
Are those bundles running in the user region?

May I ask why a bundle would like to know which other bundles haven't been started yet?

Regards,
florian

[Updated on: Thu, 16 April 2015 10:26] by Moderator

Re: Requesting to be started bundle list to virgo [message #1692578 is a reply to message #1692569]

Thu, 16 April 2015 11:37

Eclipse User

@Mathilde Maybe something as simple as a BundleListener?

@Florian I remember Glyn posting to this newsgroup that there was a service in Virgo that could be obtained via an OSGi registry lookup and which allowed client code to observe deployment events. Glyn was suggesting that service to a forum user who had an application which wanted to be aware of the successful deployment and activation of the whole plan/par content.

Re: Requesting to be started bundle list to virgo [message #1692989 is a reply to message #1692569]

Tue, 21 April 2015 02:30

Eclipse User

Hi,

to answer your question Florian :

Firs you need to know I have implemented some hibernate functionality which allow me to extend a JPA domain thanks OSGI bundle (https://github.com/echinopsii/net.echinopsii.3rdparty.hibernate-orm).

Let's say bundle A is owning the main JPA domain. I have bundles B and bundles C which are extending definition of this JPA domain (IE : bundle B and bundle C are adding new entities to JPA domain owned by A).

Currently to extend the JPA domain of bundle A, I need to stop the main JPA domain, extend the main JPA domain entities with bundle B or C entities and then restart the main JPA domain. This is not really sexy but I think this is the safier way to extend hibernate JPA domain with my current hibernate knowledge.

So with that solution we clearly have a main JPA domain inititialisation sequence where the JPA main domain may be not available until it is fully defined (ie : I need to wait all the bundle adding entities to this domain are started)...

That's why I was thinking that if bundle A is abble to know if bundle B and C are started it can say it's initialization sequence is done and the JPA main domain if fully usable ...

Cheers,

Mathilde

Re: Requesting to be started bundle list to virgo [message #1692990 is a reply to message #1692578]

Tue, 21 April 2015 02:31

Eclipse User

@GianMaria : thank you for the suggestion I will look into this. Smile

Re: Requesting to be started bundle list to virgo [message #1693000 is a reply to message #1692990]

Tue, 21 April 2015 03:43

Eclipse User

Mathilde,

I don't know Hibernate enough nor the github project you linked to give you advice about how to use Hibernate for your needs.

However, based on your comments regarding bundle A,B,C and I think you can solve this with a SynchronousBundleListener or a BundleTracker.

You could have a custom MANIFEST header, say "Extend-Domain:" and declare it in the MANIFEST.MF of B and C. You can than use a bundle listener or bundle tracker that is called by the framework OSGi every time a bundle is started. When invoked, the bundle tracker checks the bundle headers for the presence of the "Extend-Domain" header and if found acts accordingly:

String value = aBundle.getHeaders().get("Extend-Domain")

This is indeed what is normally referred to as the OSGi Extender pattern. http://toedter.com/2010/07/05/osgi-4-2-extender-pattern-and-bundletracker/

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