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import ( "sync")
type Job struct { Run func() error OnFail func(error)}
type Queue struct { jobs chan Job workers int wg sync.WaitGroup}
func NewQueue(queueSize, numWorkers int) *Queue { return &Queue{ jobs: make(chan Job, queueSize), workers: numWorkers, }}
func (q *Queue) Enqueue(job Job) bool { select { case q.jobs <- job: return true default: return false }}
func (q *Queue) Start() { for range q.workers { q.wg.Add(1) go q.worker() }}
func (q *Queue) worker() { defer q.wg.Done() for job := range q.jobs { if err := job.Run(); err != nil { if job.OnFail != nil { job.OnFail(err) } } }}
func (q *Queue) Stop() { close(q.jobs) q.wg.Wait()}