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From "Robert Varga (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KARAF-5107) Allow hooking into the feature installation process
Date Wed, 26 Apr 2017 19:27:04 GMT
Robert Varga created KARAF-5107:

             Summary: Allow hooking into the feature installation process
                 Key: KARAF-5107
                 URL: https://issues.apache.org/jira/browse/KARAF-5107
             Project: Karaf
          Issue Type: New Feature
          Components: karaf-feature
    Affects Versions: 4.1.1
            Reporter: Robert Varga

Feature service should expose a way to hook into the feature:install process, so components
living inside container can understand when a bulk bundle operation starts, ends and reaches
a major milestone.

This ability is needed to optimize OpenDaylight startup/shutdown procedures, as exemplified
by https://bugs.opendaylight.org/show_bug.cgi?id=7925 and https://bugs.opendaylight.org/show_bug.cgi?id=7927.
In these cases we are scanning deployed bundles  for well-known file locations as the bundles
get resolved. These files are then used to compile the effective model of the run-time world
(which is an expensive operation).

Since there is no way to understand that an install transaction is going on, the model is
invalidated whenever a bundle is resolved and or stopped, leading to multiple compilations
(and oftentime failures, as all requirements are not yet met) during a single feature:install
invocation or framework shutdown.

This requires having callbacks invoked from Deployer.deploy() for:
1) just before any bundle operations are performed
2) once all bundles have been resolved, but not started
3) once the operation completes and before the next bundle movement starts

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