[jira] [Created] (CAMEL-8647) Make Camel OSGI Extender Subsystem-Aware

["Manuel Holzleitner (JIRA)" <ji...@apache.org>]

Manuel Holzleitner created CAMEL-8647:
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             Summary: Make Camel OSGI Extender Subsystem-Aware
                 Key: CAMEL-8647
                 URL: https://issues.apache.org/jira/browse/CAMEL-8647
             Project: Camel
          Issue Type: Improvement
          Components: camel-core
            Reporter: Manuel Holzleitner


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] http://mail-archives.apache.org/mod_mbox/aries-user/201503.mbox/%3CCADE24oihG71CdC=pZ-zNO9rEUXNOQ4ZH4Qw4FGseoR4zxqcTuQ@mail.gmail.com%3E



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