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From "Manuel Holzleitner (JIRA)" <>
Subject [jira] [Commented] (CAMEL-8647) Make Camel OSGI Extender Subsystem-Aware
Date Tue, 19 May 2015 14:28:00 GMT


Manuel Holzleitner commented on CAMEL-8647:

Hi Claus, could you check again?

 I think this issue was unrelated to the subsystem changes and somewhere down the road in
the depending features in cxf-jaxrs and spring-context. For me at least, it seems that this
 issue has been resolved behind the scenes:

.../apache-karaf-2.4.2/bin> ./karaf
        __ __                  ____      
       / //_/____ __________ _/ __/      
      / ,<  / __ `/ ___/ __ `/ /_        
     / /| |/ /_/ / /  / /_/ / __/        
    /_/ |_|\__,_/_/   \__,_/_/         

  Apache Karaf (2.4.2)

Hit '<tab>' for a list of available commands
and '[cmd] --help' for help on a specific command.
Hit '<ctrl-d>' or type 'osgi:shutdown' or 'logout' to shutdown Karaf.

karaf@root> features:install camel
Error executing command: No feature matching camel/0.0.0
karaf@root> features:chooseurl camel 2.16-SNAPSHOT
Adding feature url mvn:org.apache.camel.karaf/apache-camel/2.16-SNAPSHOT/xml/features
karaf@root> features:install camel
karaf@root> features:install camel-cxf

> Make Camel OSGI Extender Subsystem-Aware
> ----------------------------------------
>                 Key: CAMEL-8647
>                 URL:
>             Project: Camel
>          Issue Type: Improvement
>          Components: camel-core, osgi
>            Reporter: Manuel Holzleitner
>            Assignee: Christian Schneider
>             Fix For: 2.16.0
> I would like to propose a change to the camel-core extender for components, type converters,
etc. to allow to use camel-core with subsystem-aware OSGI-containers to separate components
and it’s dependencies into subsystems. This would allow to isolate applications and camel
components (incl. it’s libraries) from each other. I.e. you could run HTTP-related components
that rely on (otherwise conflicting) HTTP client libs in different versions next to each other.
> Currently, the BundleTracker in the camel-core extender is initialized on its own BundleContext
and therefore does not receive any events from started camel component bundles that reside
in subsystems. I discussed a solution to make the camel extender subsystem-aware in the Aries
mailinglist [1], who already conducted this change in the blueprint implementation. 
> This approach from the upcoming R6 DS 1.3 spec was proposed by David Jencks as a solution:
>   - use the system bundle (bundle 0) to look for events of interest, so you see them
for all bundles
>   - have the extender register an extender capability
>   - have bundles that need extension register a matching extender requirement
>   - the extender should only extend bundles with no extender requirement or ones with
extender requirements wired to their own extender capability.
> I implemented this approach accordingly for camel and tested it in combination with the
Aries subsystem module. Any feedback to this would be very much appreciated.
> [1]

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