class Oadr20bVENEiEventService {

	public List<String> findMissingEventID(VtnSessionConfiguration vtnConfiguration, List<String> retrievedIdList) {
		Map<String, OadrEvent> map = oadrEvents.get(vtnConfiguration.getVtnId());
		if (map != null) {
			List<String> keys = new ArrayList<>(map.keySet());
			keys.removeAll(retrievedIdList);
			return keys;
		}
		return Collections.emptyList();
	}

}