channel的几种用法

channel/004/main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"fmt"
+	"math/rand"
+	"time"
+)
+
+// 现在有n个服务，每个服务都产生数据
+// 产生数据就做处理
+// 需要服务里有数据，就打印谁的
+
+// 有个可变长度的 chan of string 遍历
+func main() {
+	m1, m2, m3 := genMsg("service1"), genMsg("service2"), genMsg("service3")
+	m := merge(m1, m2, m3)
+	for {
+		fmt.Println(<-m)
+	}
+}
+
+func genMsg(name string) chan string {
+	c := make(chan string)
+	go func() {
+		i := 0
+		for {
+			time.Sleep(time.Duration(rand.Intn(2000)) * time.Millisecond)
+			c <- fmt.Sprintf("the service name is %v,the message is %v", name, i)
+			i++
+		}
+	}()
+	return c
+}
+
+func merge(chs ...chan string) chan string {
+	c := make(chan string)
+	for _, ch := range chs {
+		//copy := ch
+		go func(a chan string) {
+			for {
+				c <- <-a
+			}
+		}(ch)
+	}
+	return c
+}