Konrad Windszus created SLING-4806:
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Summary: Only invalidate those DynamicClassLoaderManagers which
are becoming invalid
Key: SLING-4806
URL: https://issues.apache.org/jira/browse/SLING-4806
Project: Sling
Issue Type: Improvement
Components: Commons
Affects Versions: Commons ClassLoader 1.3.2
Reporter: Konrad Windszus
Currently all {{DynamicClassLoaderManagers}} become invalid if
# a new bundle has been started which provides packages which have been
previously unresolvable by any of the {{DynamicClassLoader}}s or if
# a bundle is no longer active which used to provide at least one class being
loaded through one of the {{DynamicClassLoader}}s.
In that case the {{DynamicClassLoaderManagerFactory}} is first unregistered and
then reregistered
(https://github.com/apache/sling/blob/trunk/bundles/commons/classloader/src/main/java/org/apache/sling/commons/classloader/impl/Activator.java#L134)
The whole refresh logic is IMHO only necessary because the JRE caches all
classes being requested through a classloader.
The invalidation could be improved by only reregistering those
{{DynamicClassLoaderManagers}} which have been used to
# load a class which was not available in the past but may be now available
(due to a new bundle)
# load a class which was provided through a bundle which is now no longer being
available
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