public Map<Long, Set<Long>> getSessionExpiryMap() { Map<Long, Set<Long>> sessionExpiryMap; // combine local and global sessions, getting local first so upgrades // to global are caught if (localSessionTracker != null) { sessionExpiryMap = localSessionTracker.getSessionExpiryMap(); } else { sessionExpiryMap = new TreeMap<Long, Set<Long>>(); } sessionExpiryMap.putAll(globalSessionTracker.getSessionExpiryMap()); return sessionExpiryMap; } }