private Map<Long, List<BundleScriptEngineResolver>> resolvers = new ConcurrentHashMap<Long, List<BundleScriptEngineResolver>>();
public Extender(BundleContext context) {
Extender.context = context;
this.engineServiceTracker = new ServiceTracker(context, ProcessEngine.class.getName(), this);
this.bundleTracker = new BundleTracker(context, Bundle.RESOLVED | Bundle.STARTING | Bundle.ACTIVE, this);
}