package asynq import ( "log" "time" "github.com/hibiken/asynq/internal/rdb" ) type scheduler struct { rdb *rdb.RDB // channel to communicate back to the long running "scheduler" goroutine. done chan struct{} // poll interval on average avgInterval time.Duration } func newScheduler(r *rdb.RDB, avgInterval time.Duration) *scheduler { return &scheduler{ rdb: r, done: make(chan struct{}), avgInterval: avgInterval, } } func (s *scheduler) terminate() { log.Println("[INFO] Scheduler shutting down...") // Signal the scheduler goroutine to stop polling. s.done <- struct{}{} } // start starts the "scheduler" goroutine. func (s *scheduler) start() { go func() { for { select { case <-s.done: log.Println("[INFO] Scheduler done.") return case <-time.After(s.avgInterval): s.exec() } } }() } func (s *scheduler) exec() { if err := s.rdb.CheckAndEnqueue(); err != nil { log.Printf("[ERROR] could not forward scheduled tasks: %v\n", err) } }