大家看看这个模型可以用在解决哪类问题上?* H$ Z8 u# d9 N7 H, ~! Y1 l
Items serviced according to a priority are subject to "aging in queue" (i.e., other items entering at higher priority may "hog" the server). A typical protocol to address this problem is to have items gain priority by periodically checking aggregate time on queue.