// internal method called on background thread private void handleAlert(Alert alert, SimpleAlertProcessingResult result, Long creatorId) { Identity<Long> regarding = alert.getRegardingIdentity(); Set<Identity<Long>> alerted = new LinkedHashSet<Identity<Long>>(); if (regarding instanceof Event) { handleEventAlert(alert, (Event) regarding, alerted, creatorId); } result.setAlertedUsers(alerted); }