@Override
 public void disabled() {
   super.disabled();
   if (generatedDescriptorsManager != null) {
     generatedDescriptorsManager.close();
   }
   generatedDescriptorsManager = null;
   pluginBundle = null;
 }
 public Set<String> getUnresolvedExternalModuleDependencies() {
   return generatedDescriptorsManager != null
       ? generatedDescriptorsManager.getUnresolvedExternalDependencies()
       : Collections.<String>emptySet();
 }