Why not set all queueId to -1 in notifyMessageArriving?

[qc-mq]

public void notifyMessageArriving(final String topic, final int queueId,
Long tagsCode, long msgStoreTime, byte[] filterBitMap, Map<String, String> properties) {
ConcurrentHashMap<String, Byte> cids = topicCidMap.get(topic);
if (cids == null) {
return;
}
for (Map.Entry<String, Byte> cid : cids.entrySet()) {
if (queueId >= 0) {
notifyMessageArriving(topic, -1, cid.getKey(), tagsCode, msgStoreTime, filterBitMap, properties);
}
notifyMessageArriving(topic, queueId, cid.getKey(), tagsCode, msgStoreTime, filterBitMap, properties);
}
}