大家看看这个模型可以用在解决哪类问题上? + F& y, ^: ]% }5 i) J1 ]7 h3 Q+ v0 |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.