The Timer allows you to set a time interval to periodically execute an event at a specified interval.
It is useful when you want to execute certain applications after a certain interval.
Say you want to create a hourly backup of your data.
You can make a routine that will take the backup and call that routine in the Timer's event and set the timer interval for an hour.
Generates an event after a set interval, with an option to generate recurring events.
Go’s built-in timer and ticker features make both of these tasks easy.
package main
import "time"
import "fmt"
func main() {
// 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.
//The <-timer1.C blocks on the timer’s channel C until it sends a value indicating that the timer expired.
timer1 := time.NewTimer(time.Second * 2)
<-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. Here’s an example of that.
timer2 := time.NewTimer(time.Second)
go func() {
<-timer2.C
fmt.Println("Timer 2 expired")
}()
stop2 := timer2.Stop()
if stop2 {
fmt.Println("Timer 2 stopped")
}
}
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Output for the above go language program
// The first timer will expire ~2s after we start the program, but the second should be stopped before it has a chance to expire.
$ go run timers.go
Timer 1 expired
Timer 2 stopped
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