public void purge() {
CacheEntry queueEntry = expirationQueue.peek();
while ((queueEntry != null) && queueEntry.isExpired()) {
super.remove(queueEntry.getKey());
expirationQueue.remove();
queueEntry = expirationQueue.peek();
}
}
@Override
public void clear() {
super.clear();
expirationQueue.clear();
}