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Golang workers/channels example
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package main | |
import ( | |
"fmt" | |
"math/rand" | |
"os" | |
"os/signal" | |
"time" | |
) | |
type worker struct { | |
num int | |
quit chan struct{} | |
work chan int | |
} | |
func main() { | |
workCh := make(chan int, 20) | |
quitCh := make(chan struct{}, 5) | |
resultCh := make(chan string) | |
for i := 0; i < 5; i++ { | |
w := worker{ | |
num: i, | |
work: workCh, | |
quit: quitCh, | |
} | |
go w.process(resultCh) | |
} | |
go func() { | |
for results := range resultCh { | |
fmt.Println(results) | |
} | |
}() | |
for j := 0; j < 20; j++ { | |
max := 4000 | |
min := 100 | |
workCh <- rand.Intn(max-min) + min | |
} | |
c := make(chan os.Signal, 1) | |
signal.Notify(c, os.Interrupt) | |
<-c | |
// Received first interrupt, perform graceful shutdown | |
fmt.Println("Gracefully shutting down") | |
// do nice graceful shutdown... | |
for i := 0; i < 5; i++ { | |
quitCh <- struct{}{} | |
} | |
<-c | |
// Received second interrupt, quit | |
fmt.Println("Received kill, quiting now") | |
close(resultCh) | |
} | |
func (w worker) process(result chan<- string) { | |
fmt.Printf("[%d] Starting worker\n", w.num) | |
for { | |
select { | |
case dur := <-w.work: | |
// Doing some work | |
time.Sleep(time.Duration(dur) * time.Millisecond) | |
result <- fmt.Sprintf("[%d] Finished my work", w.num) | |
case <-w.quit: | |
fmt.Printf("[%d] shutting down worker\n", w.num) | |
return | |
} | |
} | |
} |
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