Package org.apache.felix.scr.impl

Class AbstractExtender

  • All Implemented Interfaces:
    java.util.EventListener, org.osgi.framework.BundleActivator, org.osgi.framework.BundleListener, org.osgi.framework.SynchronousBundleListener, org.osgi.util.tracker.BundleTrackerCustomizer<org.osgi.framework.Bundle>
    Direct Known Subclasses:
    Activator
    public abstract class AbstractExtender
extends java.lang.Object
implements org.osgi.framework.BundleActivator, org.osgi.util.tracker.BundleTrackerCustomizer<org.osgi.framework.Bundle>, org.osgi.framework.SynchronousBundleListener
    Base class to write bundle extenders. This extender tracks started bundles (or starting if they have a lazy activation policy) and will create an extension for each of them to manage it. The extender will handle all concurrency and synchronization issues. The extender guarantee that all extensions will be stopped synchronously with the STOPPING event of a given bundle and that all extensions will be stopped before the extender bundle is stopped.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private org.osgi.framework.BundleContext context  
      private java.util.concurrent.ConcurrentMap<org.osgi.framework.Bundle,​java.util.concurrent.FutureTask<java.lang.Void>> destroying  
      private java.util.concurrent.ConcurrentMap<org.osgi.framework.Bundle,​Activator.ScrExtension> extensions  
      private boolean stopped  
      private boolean stopping  
      private org.osgi.util.tracker.BundleTracker<org.osgi.framework.Bundle> tracker  

    • Method Summary

      All Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      org.osgi.framework.Bundle addingBundle​(org.osgi.framework.Bundle bundle, org.osgi.framework.BundleEvent event)  
      void bundleChanged​(org.osgi.framework.BundleEvent event)  
      protected java.util.Collection<org.osgi.framework.Bundle> chooseBundlesToDestroy​(java.util.Set<org.osgi.framework.Bundle> bundles)  
      protected java.util.concurrent.ExecutorService createExecutor()
      Create the executor used to start extensions asynchronously.
      private void createExtension​(org.osgi.framework.Bundle bundle)  
      protected abstract void debug​(org.osgi.framework.Bundle bundle, java.lang.String msg)  
      private void destroyExtension​(org.osgi.framework.Bundle bundle)  
      protected abstract Activator.ScrExtension doCreateExtension​(org.osgi.framework.Bundle bundle)
      Create the extension for the given bundle, or null if the bundle is not to be extended.
      protected void doStart()  
      protected void doStop()  
      org.osgi.framework.BundleContext getBundleContext()  
      boolean isStopping()  
      void modifiedBundle​(org.osgi.framework.Bundle bundle, org.osgi.framework.BundleEvent event, org.osgi.framework.Bundle object)  
      void removedBundle​(org.osgi.framework.Bundle bundle, org.osgi.framework.BundleEvent event, org.osgi.framework.Bundle object)  
      void start​(org.osgi.framework.BundleContext context)  
      protected void startTracking()  
      void stop​(org.osgi.framework.BundleContext context)  
      protected void stopTracking()  
      protected abstract void warn​(org.osgi.framework.Bundle bundle, java.lang.String msg, java.lang.Throwable t)  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • extensions

        private final java.util.concurrent.ConcurrentMap<org.osgi.framework.Bundle,​Activator.ScrExtension> extensions

      • destroying

        private final java.util.concurrent.ConcurrentMap<org.osgi.framework.Bundle,​java.util.concurrent.FutureTask<java.lang.Void>> destroying

      • stopping

        private volatile boolean stopping

      • stopped

        private volatile boolean stopped

      • context

        private org.osgi.framework.BundleContext context

      • tracker

        private org.osgi.util.tracker.BundleTracker<org.osgi.framework.Bundle> tracker

    • Constructor Detail

      • AbstractExtender

        public AbstractExtender()

    • Method Detail

      • getBundleContext

        public org.osgi.framework.BundleContext getBundleContext()

      • isStopping

        public boolean isStopping()

      • start

        public void start​(org.osgi.framework.BundleContext context)
           throws java.lang.Exception
        Specified by:
        start in interface org.osgi.framework.BundleActivator
        Throws:
        java.lang.Exception

      • stop

        public void stop​(org.osgi.framework.BundleContext context)
          throws java.lang.Exception
        Specified by:
        stop in interface org.osgi.framework.BundleActivator
        Throws:
        java.lang.Exception

      • doStart

        protected void doStart()
                throws java.lang.Exception
        Throws:
        java.lang.Exception

      • doStop

        protected void doStop()
               throws java.lang.Exception
        Throws:
        java.lang.Exception

      • startTracking

        protected void startTracking()

      • stopTracking

        protected void stopTracking()

      • createExecutor

        protected java.util.concurrent.ExecutorService createExecutor()
        Create the executor used to start extensions asynchronously.
        Returns:
        an

      • chooseBundlesToDestroy

        protected java.util.Collection<org.osgi.framework.Bundle> chooseBundlesToDestroy​(java.util.Set<org.osgi.framework.Bundle> bundles)

      • bundleChanged

        public void bundleChanged​(org.osgi.framework.BundleEvent event)
        Specified by:
        bundleChanged in interface org.osgi.framework.BundleListener

      • addingBundle

        public org.osgi.framework.Bundle addingBundle​(org.osgi.framework.Bundle bundle,
                                              org.osgi.framework.BundleEvent event)
        Specified by:
        addingBundle in interface org.osgi.util.tracker.BundleTrackerCustomizer<org.osgi.framework.Bundle>

      • modifiedBundle

        public void modifiedBundle​(org.osgi.framework.Bundle bundle,
                           org.osgi.framework.BundleEvent event,
                           org.osgi.framework.Bundle object)
        Specified by:
        modifiedBundle in interface org.osgi.util.tracker.BundleTrackerCustomizer<org.osgi.framework.Bundle>

      • removedBundle

        public void removedBundle​(org.osgi.framework.Bundle bundle,
                          org.osgi.framework.BundleEvent event,
                          org.osgi.framework.Bundle object)
        Specified by:
        removedBundle in interface org.osgi.util.tracker.BundleTrackerCustomizer<org.osgi.framework.Bundle>

      • createExtension

        private void createExtension​(org.osgi.framework.Bundle bundle)

      • destroyExtension

        private void destroyExtension​(org.osgi.framework.Bundle bundle)

      • doCreateExtension

        protected abstract Activator.ScrExtension doCreateExtension​(org.osgi.framework.Bundle bundle)
                                                     throws java.lang.Exception
        Create the extension for the given bundle, or null if the bundle is not to be extended.
        Parameters:
        bundle - the bundle to extend
        Returns:
        The extension
        Throws:
        java.lang.Exception - If something goes wrong

      • debug

        protected abstract void debug​(org.osgi.framework.Bundle bundle,
                              java.lang.String msg)

      • warn

        protected abstract void warn​(org.osgi.framework.Bundle bundle,
                             java.lang.String msg,
                             java.lang.Throwable t)