How to Implement the Fan-Out/Fan-In Pattern in Go
Implement Fan-Out/Fan-In in Go by spawning goroutines to process items from a shared channel and sending results to a results channel, then closing the results channel once all workers finish.
package main
import (
"fmt"
"sync"
)
func worker(id int, jobs <-chan int, results chan<- int, wg *sync.WaitGroup) {
defer wg.Done()
for j := range jobs {
results <- j * 2
}
}
func main() {
jobs := make(chan int, 100)
results := make(chan int, 100)
var wg sync.WaitGroup
for w := 1; w <= 3; w++ {
wg.Add(1)
go worker(w, jobs, results, &wg)
}
go func() {
for j := 1; j <= 10; j++ {
jobs <- j
}
close(jobs)
wg.Wait()
close(results)
}()
for r := range results {
fmt.Println(r)
}
}