Enqueuer.pollAsync(Queue) can read (poll) the queue.Enqueuer application to exact-date scheduling.Queue.offer(Object), and possibly schedules Enqueuer.pollAsync(Queue) execution.Enqueuer instances i.e.CompletableFuture.completedFuture(Object) (immediate completion)return goTo(...).Enqueuer that polls and executes async tasks AsyncRunnable one by oneTaskEnqueuer.