Cron Scheduling

Comparable to: node-cron, APScheduler, crontab

Key Concepts

Use the concepts below when they fit the task. Not every scheduled job needs all of them.

• Cron expressions use a 7-field format: second minute hour day month weekday year
• The cron parser also accepts 5-field (no seconds) and 6-field (no year) expressions, but 7-field is the standard.
• iii-cron evaluates expressions and fires triggers on schedule
• Handlers should be fast — enqueue heavy work to a queue instead of blocking the cron handler
• Each cron trigger binds one expression to one function
• Overlapping schedules are fine; each trigger fires independently

Architecture

iii-cron timer tick
  → registerTrigger type:'cron' expression match