public Message poll() {
if (isEmpty()) return null;
Message m = realtimeQueue.poll();
if (m == null) {
m = priorityQueue.poll();
}
if (m == null) {
m = orderedQueue.poll();
}
if (m == null) {
m = basicQueue.poll();
}
if (size > 0) size--;
return m;
}
public void add(Message message) {
if (message == null) throw new NullPointerException("Message must not be null");
if (size == max) throw new QueueFullException("Queue reached max size: " + max);
boolean increment = true;
if (message instanceof RealtimeMessage) {
increment = !realtimeQueue.addRemoves(message);
} else if (message instanceof PriorityMessage) {
priorityQueue.add(message);
} else if (message instanceof OrderedMessage) {
orderedQueue.add(message);
} else {
basicQueue.add(message);
}
if (increment) size++;
total++;
}