initial import

best-practices/context-loop/main.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"context"
+	"log"
+	"time"
+)
+
+func loop(ctx context.Context) <-chan string {
+	c := make(chan string)
+	go func() {
+		for {
+			select {
+			case <-ctx.Done():
+				close(c)
+				return
+			default:
+				c <- "Hello World!"
+			}
+			time.Sleep(1 * time.Second)
+		}
+	}()
+	return c
+}
+
+func main() {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	for s := range loop(ctx) {
+		log.Println(s)
+	}
+
+	log.Println("nächste Variante")
+
+	ctx, cancel = context.WithCancel(context.Background())
+	time.AfterFunc(5*time.Second, cancel)
+	for s := range loop(ctx) {
+		log.Println(s)
+	}
+
+}