org.osgi.framework.hooks.service.EventListenerHook Java Examples

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Example #1
Source File: DelayedProbeInvokerFactory.java    From nexus-public with Eclipse Public License 1.0 5 votes vote down vote up 
/**
 * Workaround https://issues.apache.org/jira/browse/KARAF-4899 by
 * re-adding probe bundle to root region before any service lookup
 * (avoids spurious service lookup issues due to region filtering)
 */
private void installRegionWorkaround(final BundleContext context) {
  Map<String, ?> maxRanking = singletonMap(SERVICE_RANKING, Integer.MAX_VALUE);

  // add probe to root region on install
  context.registerService(EventHook.class,
      (event, contexts) -> {
        if (event.getType() == BundleEvent.INSTALLED) {
          fixProbeRegion(event.getBundle());
        }
      }, new Hashtable<>(maxRanking));

  // add probe to root region whenever a service it's listening to changes
  context.registerService(EventListenerHook.class,
      (event, listeners) -> {
        if (((String[]) event.getServiceReference().getProperty(Constants.OBJECTCLASS))[0].contains("pax.exam")) {
          listeners.keySet().stream().map(BundleContext::getBundle).forEach(this::fixProbeRegion);
        }
      }, new Hashtable<>(maxRanking));

  // add probe to root region whenever it's directly looking up a service
  context.registerService(FindHook.class,
      (findContext, name, filter, allServices, references) -> {
        if ((name != null && name.contains("pax.exam")) || (filter != null && filter.contains("pax.exam"))) {
          fixProbeRegion(findContext.getBundle());
        }
      }, new Hashtable<>(maxRanking));
}