[jira] Commented: (FELIX-29) Implement bundle fragments

["Richard S. Hall (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FELIX-29?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601435#action_12601435 ] 

Richard S. Hall commented on FELIX-29:
--------------------------------------

I have committed a very preliminary step toward fragment support. The new patch allows fragments to be used to extend the bundle class path of the host bundle with content from the fragment. Nothing else is supported at this point (i.e., fragments cannot import, require, export, nor contain native code). Further, fragments are not yet hooked into the update/refresh mechanisms of Package Admin, so don't try to dynamically update and refresh them.

Currently, a fragment content is searched after the host bundle class path according to the fragment's bundle class path. It is also possible for the host bundle to reference fragment content on its own bundle class path to interpose fragment content with its own.

My priorities are:

1. Get update/refresh working.
2. Get native code working.
3. Get import/require working.
4. Get export working.

At first blush, it appears that (4) will be the trickiest since it breaks some assumptions in our resolving algorithm. I think the others should be reasonably straightforward, but the devil is in the details. It might be the case that between steps (3) and (4) some major refactoring will be done to clean things up quite a bit, but if we can get 1-3 working well, then that should be a good start.

> Implement bundle fragments
> --------------------------
>
>                 Key: FELIX-29
>                 URL: https://issues.apache.org/jira/browse/FELIX-29
>             Project: Felix
>          Issue Type: New Feature
>          Components: Framework, Specification compliance
>            Reporter: Richard S. Hall
>            Assignee: Richard S. Hall
>
> This issue is described in section 3.14 of the OSGi R4 specification. The main jist is that a logical bundles can now be defined in more than one physical bundle. This means that fragment bundles logically merge with their host bundle at run time. This issue impacts the resolver algorithm and will likely have some impacts on the run-time class loading search order.

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