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Go Tickers

Go Tickers are used when we want to some work at regular interval of time. Tickers can be stopped like timers using the Stop() method.

The NewTicker() method returns a new Ticker having a channel which send the time according to the duration argument. The duration must be larger than zero, if not, the ticker will panic.

The Tick() is a wrapper for NewTicker which provides access to the ticking channel. The Tick() method is useful for clients who don't want to shutdown the Ticker.

Go Tickers Example

package main
import "time"
import "fmt"
func main() {
	tickerValue := time.NewTicker(time.Millisecond * 100)
	go func() {
		for t := range tickerValue.C {
			fmt.Println("Tick at", t)
		}
	}()
	time.Sleep(time.Millisecond * 500)
	tickerValue.Stop()
	fmt.Println("Ticker stopped")
}

Output:

Tick at 2017-10-07 17:26:35.946279716 +0530 IST m=+0.101345812
Tick at 2017-10-07 17:26:36.046371811 +0530 IST m=+0.201437907
Tick at 2017-10-07 17:26:36.146417657 +0530 IST m=+0.301483753
Tick at 2017-10-07 17:26:36.24851386 +0530 IST m=+0.403579956
Tick at 2017-10-07 17:26:36.346476978 +0530 IST m=+0.501543074
Ticker stopped

Go Ticker Example 2

package main
import (
	"log"
	"time"
)
func haveFun(s string) {
	log.Printf("\tA: Let's have fun: %v", s)
}
func doPolling() {
	for _ = range time.Tick(2 * time.Second) {
		haveFun("\t B : Okay!")
	}
}
func main() {
	go doPolling()
	select {} //The select statement lets a goroutine wait on multiple communication operations.
}

Output:

2017/10/07 18:15:15 	A: Let's have fun: 	 B : Okay!
2017/10/07 18:15:17 	A: Let's have fun: 	 B : Okay!
2017/10/07 18:15:19 	A: Let's have fun: 	 B : Okay!
2017/10/07 18:15:21 	A: Let's have fun: 	 B : Okay!
2017/10/07 18:15:23 	A: Let's have fun: 	 B : Okay!
2017/10/07 18:15:25 	A: Let's have fun: 	 B : Okay!

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