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https://issues.apache.org/jira/browse/SLING-3279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13845366#comment-13845366
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Felix Meschberger commented on SLING-3279:
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I am ok with using Oak observation instead of JCR observation.
But I am really concerned with duplicating OSGi EventAdmin tasks like getting
EventHandler services and analyzing their setup in a spec. compliant way.
If we would want to go down the route of not using the EventAdmin threading
functionality any longer we can use synchronous events which are just send to
the recipients immediately leveraging EventAdmin's listener selection but not
EventAdmin thread pools.
> Leverage improved observation support from Oak
> ----------------------------------------------
>
> Key: SLING-3279
> URL: https://issues.apache.org/jira/browse/SLING-3279
> Project: Sling
> Issue Type: Improvement
> Components: JCR
> Reporter: Michael Dürig
>
> OAK-1120 introduces better support for observation, which could be used by
> Sling. For example JcrResourceListener could be rewritten leveraging Oak's
> Observer. Since Oak observers already run on background threads further
> decoupling (like it is currently done) is not necessary. This makes it
> unnecessary to queue potentially a lot of events in Sling. Since neither Oak
> there does queue events (they are generated by need) this will probably
> greatly improve scalability in the face of many events.
> Furthermore OSGi filters could be passed down and translated to Oak such that
> filtering is done much closer to the source of the events.
> Finally instead of using a centralised event dispatcher (like
> JcrResourceListener currently is) it would be better to install a dedicated
> Observer for each OSGi event listener since dispatching is already handled by
> Oak and thread pooling (i.e. assigning threads for dispatching call backs to
> observers) can be controlled through Sling's thread pool support (*). This
> has the further advantage of making individual stats available for the
> listeners through JMX.
> (*) Register an OakExecutor backed by e.g. a Sling thread pool and it will be
> picked up by Oak.
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