queuing system that allows you to dequeue multiple items at once

I'm wondering if there is a queuing system that allows one to dequeue multiple items at once. A quick google search turned up oracle's Advanced Queuing, but the use case doesn't warrant anything as 开发者_运维问答crazy as getting oracle licenses. I'm pretty convinced there is no such system that is open source or at least not oracle expensive, but I thought i'd ask just in case. The goal behind this is to implement reliable batching of queued items, so if anyone has a suggestion on how to do it without writing your own application level implementation, that would be welcome.