// each working jobs from the queue Queue // at the specified Interval using the WorkMap. type WorkerPool struct { WorkMap WorkMap Interval time.Duration Queue string c *Client workers []*Worker mu sync.Mutex done bool }
a Job. // If an error is returned, the job // is reenqueued with exponential backoff. type WorkFunc func(j *Job) error // WorkMap is a map of Job names to WorkFuncs // that are used to perform Jobs of a // given type. type WorkMap map[string]WorkFunc
in the WorkerPool. func (w *WorkerPool) Start() { w.mu.Lock() defer w.mu.Unlock() for i := range w.workers { w.workers[i] = NewWorker(w.c, w.WorkMap) w.workers[i].Interval = w.Interval w.workers[i].Queue = w.Queue go w.workers[i].Work() } }
pulls jobs off the specified Queue. If no Job // is found, the Worker will sleep for Interval seconds. type Worker struct { // Interval is the amount of time that this Worker should sleep before trying // to find another Job. Interval time.Duration // Queue is the name of the queue to pull Jobs off of. The default value, "", // is usable and is the default for both que-go and the ruby que library. Queue string c *Client m WorkMap mu sync.Mutex done bool ch chan struct{} }
Queue at its Interval. This function only // returns after Shutdown() is called, so it should be run in its own goroutine. func (w *Worker) Work() { for { select { case <-w.ch: log.Println("worker done") return case <-time.After(w.Interval): for { if didWork := w.WorkOne(); !didWork { break // didn't do any work, go back to sleep } } } } }
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