workers := make([]chan expiryOp, 0, n)
	es.workers.Store(&workers)
	es.ResizeWorkers(n)
	return es
}

func (es *expiryState) getWorkerCh(h uint64) chan<- expiryOp {
	w := es.workers.Load()
	if w == nil || len(*w) == 0 {
		return nil
	}
	workers := *w
	return workers[h%uint64(len(workers))]
}

func (es *expiryState) ResizeWorkers(n int) {
	if n == 0 {
		n = 100
	}