In the abstract sense instead of pulling from queues round-robin you can assign "tokens" to each queue round robin. When the number of tokens a queue has is equ

In the abstract sense instead of pulling from queues round-robin you can assign "tokens" to each queue round robin. When the number of tokens a queue has is equal to the cost of the request reset the tokens and pull that request. This can also be used to handle priority. Maybe paying customers or customers on the enterprise plan get 2 tokens per round or their requests only have half of the cost.