func newDelayingQueue(clock clock.Clock) DelayingInterface {
ret := &delayingType{
Interface: New(),
clock: clock,
heartbeat: clock.Tick(maxWait),
stopCh: make(chan struct{}),
waitingTimeByEntry: map[t]time.Time{},
waitingForAddCh: make(chan waitFor, 1000),
}
go ret.waitingLoop()
return ret
}
