code: @Override
      public void notificationCreated(RuntimeUpdateManager updateManager, RuntimeUpdateNotification notification) {
  
          class MyCompletionListener implements CompletionListener<Boolean> {
              String notificationName;
  
              public MyCompletionListener(String name) {
                  notificationName = name;
              }
  
              @Override
              public void successfulCompletion(Future<Boolean> future, Boolean result) {
                  // The configuration update for which we were monitoring is now complete.
                  // Update our awareness to the update and perform any deferred actions.
                  configUpdateCompleted(notificationName);
              }
  
              @Override
              public void failedCompletion(Future<Boolean> future, Throwable t) {
                  // The configuration update failed, but we still want to resume functions.
                  // Update our awareness to the update and perform any deferred actions.
                  configUpdateCompleted(notificationName);
              }
          }
  
          if (deactivated)
              return;
  
          int prevCnt = configUpdateInProgress();
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
              Tr.debug(PersistentExecutorImpl.this, tc, "Notified of \"" + notification.getName() + "\" previous configUpdatesInProgress: " + prevCnt);
  
          FutureMonitor futureMonitor = _futureMonitor;
          if (futureMonitor != null) {
              MyCompletionListener newListener = new MyCompletionListener(notification.getName());
  
              futureMonitor.onCompletion(notification.getFuture(), newListener);
          }
      }
docs: This method is driven for various RuntimeUpdateNotification's. When we receive a
  notification we will bump our count of active configuration updates in progress. A non-zero count value
  signifies configuration update(s) are in progress.
  
  We monitor the completion of the Futures related to the notifications. When we
  are driven for their completion we decrement our configuration update in progress count.
  
  @see com.ibm.ws.runtime.update.RuntimeUpdateListener#notificationCreated(com.ibm.ws.runtime.update.RuntimeUpdateManager, com.ibm.ws.runtime.update.RuntimeUpdateNotification)