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Use Cases

Order Auto-Cancel​

Unpaid after 15 minutes, auto close and release inventory.

// Order created → schedule auto-cancel
q.Add(ctx, &seqdelay.Task{
    ID:    "cancel-" + orderID,
    Topic: "order-auto-cancel",
    Delay: 15 * time.Minute,
    TTR:   30 * time.Second,
})

// User pays → cancel the task
q.Cancel(ctx, "order-auto-cancel", "cancel-" + orderID)

Payment Callback Retry​

Alipay/WeChat async notification with progressive intervals.

intervals := []time.Duration{0, 2*time.Minute, 10*time.Minute, 1*time.Hour, 6*time.Hour}

q.OnExpire("payment-notify", func(ctx context.Context, task *seqdelay.Task) error {
    err := sendNotification(task.Body)
    if err != nil {
        return err // TTR will handle retry with next interval
    }
    return nil
})

Membership Reminder​

Send SMS 15 days and 3 days before expiration.

q.Add(ctx, &seqdelay.Task{
    ID: "remind-15d-" + userID, Topic: "membership-remind",
    Delay: expiresAt.Add(-15 * 24 * time.Hour).Sub(time.Now()),
})

q.Add(ctx, &seqdelay.Task{
    ID: "remind-3d-" + userID, Topic: "membership-remind",
    Delay: expiresAt.Add(-3 * 24 * time.Hour).Sub(time.Now()),
})

More Scenarios​

  • Coupon expiration — notify before expiry, then invalidate
  • Scheduled push — marketing messages at a specific future time
  • Rate limit cooldown — unlock account after temporary ban expires
  • Auto-review — default positive review after 5 days without user action