【Golang进阶】定时器

Ticker

1. 用时间阻塞主程序，从而控制ticker

func main()  {
   // 初始化ticker，每秒执行一次
	var ticker = time.NewTicker(1 * time.Second)
    
	go func() {
		for t := range ticker.C {
			fmt.Println("tick at", t)
		}
	}()
   // 阻塞主程序防退出
	time.Sleep(time.Second * 5)
	// 主动终止
	ticker.Stop()
}

输出结果

ticker1 at 2019-05-21 14:57:56.562591 +0800 CST m=+1.005065934
ticker1 at 2019-05-21 14:57:57.562549 +0800 CST m=+2.005016651
ticker1 at 2019-05-21 14:57:58.558122 +0800 CST m=+3.000583914
ticker1 at 2019-05-21 14:57:59.563205 +0800 CST m=+4.005660201
ticker1 at 2019-05-21 14:58:00.562585 +0800 CST m=+5.005033303

2. 用channel来精准控制次数

func main()  {
	var ticker2 = time.NewTicker(100 * time.Millisecond)
  
	// 创建buffer为2的channel
	c := make(chan int, 2)
	go func() {
		for t := range ticker2.C{
			// 往channel写数据，写满buffer后终止程序
			c <- 1
			fmt.Println("ticker2 at ", t)
		}
	}()

	time.Sleep(time.Second * 500)
	fmt.Println("ticker stopped")
}

输出结果

ticker2 at 2019-05-21 14:57:55.65885 +0800 CST m=+0.101330668
ticker2 at 2019-05-21 14:57:55.758399 +0800 CST m=+0.200878747