Daily Archives: 15.06.2019
Golang patterns. Worker pool
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func worker(id int, jobs <-chan int, results chan<- int) { for j := range jobs { fmt.Println("worker", id, "started job", j) time.Sleep(time.Second) fmt.Println("worker", id, "finished job", j) results <- j * 2 } } func main() { // In order to use our pool of workers we need to send // them work and collect their results. We make 2 // channels for this. jobs := make(chan int, 100) results := make(chan int, 100) // This starts up 3 workers, initially blocked // because there are no jobs yet. for w := 1; w <= 3; w++ { go worker(w, jobs, results) } // Here we send 5 `jobs` and then `close` that // channel to indicate that's all the work we have. for j := 1; j <= 5; j++ { jobs <- j } close(jobs) for a := 1; a <= 5; a++ { <-results } } |
Further reading: https://gobyexample.com/worker-pools