Created
October 19, 2021 15:11
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Go worker pattern
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package main | |
import ( | |
"fmt" | |
"sync" | |
"time" | |
) | |
func worker(wg *sync.WaitGroup, requestChannel <-chan string, responseChannel chan<- int, id int) { | |
defer wg.Done() | |
fmt.Printf("Worker %d starting\n", id) | |
time.Sleep(time.Second) | |
for request := range requestChannel { | |
time.Sleep(time.Second) | |
fmt.Println(request) | |
responseChannel <- id * 2 | |
} | |
} | |
func monitorWorker(wg *sync.WaitGroup, requestChannel chan string, responseChannel chan int) { | |
//close(requestChannel) | |
//wg.Wait() | |
//close(responseChannel) | |
} | |
func printWorker(responseChannel chan int, done chan<- bool) { | |
time.Sleep(time.Second) | |
for i := range responseChannel { | |
fmt.Println(i) | |
} | |
//close(responseChannel) | |
done <- true | |
} | |
func main() { | |
wg := new(sync.WaitGroup) | |
requestChannel := make(chan string) | |
responseChannel := make(chan int, 3) | |
requests := []string{"r1", "r2", "r3"} | |
for i := 1; i <= 2; i++ { | |
wg.Add(1) | |
i := i | |
go worker(wg, requestChannel, responseChannel, i) | |
} | |
for _, request := range requests { | |
requestChannel <- request | |
} | |
//go monitorWorker(wg, requestChannel, responseChannel) | |
close(requestChannel) | |
wg.Wait() | |
close(responseChannel) | |
fmt.Println("results") | |
done := make(chan bool, 1) | |
go printWorker(responseChannel, done) | |
<-done | |
} |
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