What is important to consider in a polling worker?

In a polling worker, it is important to consider several key points:

1. Polling interval — choose an optimal frequency to avoid overloading the system and missing events.

2. Error handling and retries — if a request to the data source fails, the worker should handle the error correctly and try again after some time.

3. Idempotency — so that repeated polling does not lead to duplicate processing of the same data.

4. Stopping and restarting — the worker should correctly terminate on a signal and be able to restart without data loss.

5. Logging and monitoring — to track the state and identify issues.

6. Resource management — control memory and CPU consumption so that polling does not negatively impact the system.

Example in Go (simplified):

func pollingWorker(ctx context.Context, interval time.Duration) {
    ticker := time.NewTicker(interval)
    defer ticker.Stop()

    for {
        select {
        case <-ctx.Done():
            return
        case <-ticker.C:
            err := pollAndProcess()
            if err != nil {
                log.Printf("polling error: %v", err)
                // can add backoff or retry
            }
        }
    }
}

This approach ensures stable and reliable operation of the polling worker.