if (manager == null || cache == null) {
throw new StageException("helixmanager|HealthDataCache attribute value is null");
}
if (_alertsHolder == null) {
_statsHolder = new StatsHolder(manager, cache);
_alertsHolder = new AlertsHolder(manager, cache, _statsHolder);
} else {
_statsHolder.updateCache(cache);
_alertsHolder.updateCache(cache);
}