[jira] [Created] (ARIES-1365) ServiceState attribute notifications slow down startup/shutdown time considerably

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

Joel Richard created ARIES-1365:
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             Summary: ServiceState attribute notifications slow down startup/shutdown time considerably
                 Key: ARIES-1365
                 URL: https://issues.apache.org/jira/browse/ARIES-1365
             Project: Aries
          Issue Type: Bug
          Components: JMX
    Affects Versions: jmx-core-1.1.3
         Environment: org.apache.felix.framework 5.0.1
            Reporter: Joel Richard


Around 20% of the startup time of our Felix OSGI container is spent creating attribute notifications for changed services in ServiceState#getAttributeChangeNotification. This is so slow because for each notification it calls bundleContext.getAllServiceReferences to get all service ids.

Here a few suggestions how this could be improved:
- The ServiceState could maintain its own list of service ids which is updated according to the service events
- The ServiceState could implement the NotificationEmitter directly and be aware when there are any listeners (in our case, there are mostly none).
- Make it possible to disable the attribute change notifications with configuration property.



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