Timer based

• Cron to put into message queue after expiration

  • Flowchart

  • Cons

Cron to put into message queue after expiration

Flowchart

• Task producers set timer to send tasks to queue after certain time (30minutes).

• The most popular timer implementation is based on Cron job.

  • Cron and crontab: https://www.hostgator.com/help/article/what-are-cron-jobs

Flowchart

Cons

• Could not support high concurrent volume because most timer middleware don't support it.