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timers.go
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timers.go
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package main
import (
"fmt"
"time"
)
// We often want to execute Go code at some point in the future,
// or repeatedly at some interval. Go’s built-in timer and ticker features make both of these tasks easy.
// We’ll look first at timers and then at tickers.
// Timer function ilustrate timers in go
func Timer() {
// 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)
// The <-timer1.C blocks 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.
// 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("Timer2 Stopped")
}
// The first timer will expire ~2s after we start the program,
// but the second should be stopped before it has a chance to expire.
}