[jira] [Created] (KARAF-1957) Allow to mark features as 'aggregate' features

["Raul Kripalani (JIRA)" <ji...@apache.org>]

Raul Kripalani created KARAF-1957:
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             Summary: Allow to mark features as 'aggregate' features
                 Key: KARAF-1957
                 URL: https://issues.apache.org/jira/browse/KARAF-1957
             Project: Karaf
          Issue Type: New Feature
          Components: karaf-feature
    Affects Versions: 2.3.0, 2.2.9
            Reporter: Raul Kripalani


When creating features descriptors, one would typically cross-reference features in two cases:

* to express dependency => when feature A depends on feature B and feature C
* to express aggregation => when you want to provide a single 'entry point' to install the entire application, i.e. feature A is a conglomerate of feature B and feature C

If you're after the second use case, Karaf has a shortcoming: uninstalling feature A won't automatically uninstall feature B and C.

This makes a lot of sense, so I wouldn't change this behaviour. However, it would be nice to be able to mark a feature as an aggregate, so Karaf will know in what cases it makes sense to uninstall referenced features.

A simplified example:

{code}
<feature name="A" aggregate="true">
  <feature>B</feature>
  <feature>C</feature>
</feature>
{code}

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