32_timers.go

package gobyexample

import (
	"fmt"
	"time"
)

// TimersDemo - demonstrates using Go's built-in timers
func TimersDemo() {
	// Timers represent a single event in the future. You tell the timer
	// how long you want to wait, and it provides a channel that will be
	// notified at that time. This timer will wait 2 seconds.
	timer1 := time.NewTimer(2 * time.Second)

	// Block on the timer's channel C until it sends a value indicating
	// that the timer expired.
	<-timer1.C
	fmt.Println("Timer 1 expired")

	// If you just wanted to wait, you could have used `time.Sleep`.
	// One reason a timer may be useful is that you can cancel the timer
	// before it expires.
	timer2 := time.NewTimer(time.Second)
	go func() {
		<-timer2.C
		fmt.Println("Timer 2 expired")
	}()
	stop2 := timer2.Stop()
	if stop2 {
		fmt.Println("Timer 2 stopped")
	}
}