Application qos involving priority and bandwidth

Application qos involving priority and bandwidth

Our manager wants us to do applicaiton qos which is quite different from
the well-known system qos. We have many services of three types, they have
priorites, the manager wants to suspend low priority services requests
when there are not enough bandwidth for high priority services. But if the
high priority services requests decrease, the bandwidth for low priority
services should increase and low priority service requests are allowed
again.
There should be an algorithm involving priority and bandwidth. I don't
know how to design the algorithm, is there any example on the internet?
Somebody can give suggestion?
Thanks.
UPDATE All these services are within a same process. We are setting the
maximum bandwidth for the three types of services via ports of services
via TC (TC is the linux qos tool whose name means traffic control).