有什么方法可以設(shè)計(jì)一個(gè)在 Golang 中的特定未來時(shí)間到期的計(jì)時(shí)器？我的意思是一個(gè)在凌晨 2 點(diǎn)到期的計(jì)時(shí)器（讓當(dāng)前時(shí)間為凌晨 12 點(diǎn)）。我知道一種方法是使用， timer(target_future_time - current_time)但似乎不是一種確切的方法（考慮到執(zhí)行時(shí)間可能不準(zhǔn)確）。有人可以幫忙嗎？
2 回答
MM們
TA貢獻(xiàn)1886條經(jīng)驗(yàn) 獲得超2個(gè)贊
在golang中，可能有兩種方式創(chuàng)建ticker，如下所示：
package main
import (
"fmt"
"time"
)
func main() {
//第一種實(shí)現(xiàn)方式
ticker1 := time.NewTicker(1 * time.Second)
i := 1
for c := range ticker1.C {
i++
fmt.Println(c.Format("2006/01/02 15:04:05.999999999"))
if i > 5 {
ticker1.Stop()
break
}
}
fmt.Println(time.Now().Format("2006/01/02 15:04:05.999999999"), " 1 Finished.")
//第二種實(shí)現(xiàn)方式
i = 1
ticker2 := time.AfterFunc(1*time.Second, func() {
i++
fmt.Println(time.Now().Format("2006/01/02 15:04:05.999999999"))
})
for {
select {
case <-ticker2.C:
fmt.Println("nsmei")
case <-time.After(3 * time.Second):
if i <= 5 {
ticker2.Reset(1 * time.Second)
continue
}
goto BRK
}
BRK:
ticker2.Stop()
break
}
fmt.Println(time.Now().Format("2006/01/02 15:04:05.999999999"), " 2 Finished.")
}
輸出：
2016/01/26 16:46:34.261248567
2016/01/26 16:46:35.256381743
2016/01/26 16:46:36.259717152
2016/01/26 16:46:37.260320837
2016/01/26 16:46:38.259312704
2016/01/26 16:46:38.259410752 1 Finished.
2016/01/26 16:46:39.260604274
2016/01/26 16:46:42.261091322
2016/01/26 16:46:45.263136257
2016/01/26 16:46:48.264193517
2016/01/26 16:46:51.265655137
2016/01/26 16:46:53.265722632 2 Finished.
根據(jù)執(zhí)行，第一個(gè)比第二個(gè)更精確。
在您的情況下，您可以使用time.Time.Sub()計(jì)算持續(xù)時(shí)間，并使用第二種方法執(zhí)行一次，其余使用第一種方法。
我希望這些對你有幫助！
慕斯709654
TA貢獻(xiàn)1840條經(jīng)驗(yàn) 獲得超5個(gè)贊
下面的代碼達(dá)到了你的目的。您所要做的就是按照下面 main() 函數(shù)中顯示的方式調(diào)用 ScheduleAlarm()。
package main
import (
"strings"
"strconv"
"fmt"
"time"
)
// A struct for representing time.
type Time struct {
Hh int // Hours.
Mm int // Minutes.
Ss int // Seconds.
}
func main() {
/*
Set the alarm as shown below.
Time must be specified in 24 hour clock format.
Also, pass the callback to be called after the alarm is triggered.
*/
alarm := ScheduleAlarm(Time{23, 28, 0}, func() {
fmt.Println("alarm received")
})
// Do your stuff.
for i := 0; i < 10; i++ {
fmt.Println(i)
time.Sleep(2 * time.Second)
}
// Don't forget to call the below line whenever you want to block.
<-alarm
}
// Call this function to schedule the alarm. The callback will be called after the alarm is triggered.
func ScheduleAlarm(alarmTime Time, callback func() ()) (endRecSignal chan string) {
endRecSignal = make(chan string)
go func() {
timeSplice := strings.Split(time.Now().Format("15:04:05"), ":")
hh, _ := strconv.Atoi(timeSplice[0])
mm, _ := strconv.Atoi(timeSplice[1])
ss, _ := strconv.Atoi(timeSplice[2])
startAlarm := GetDiffSeconds(Time{hh, mm, ss}, alarmTime)
// Setting alarm.
time.AfterFunc(time.Duration(startAlarm) * time.Second, func() {
callback()
endRecSignal <- "finished recording"
close(endRecSignal)
})
}()
return
}
func GetDiffSeconds(fromTime, toTime Time) int {
fromSec := GetSeconds(fromTime)
toSec := GetSeconds(toTime)
diff := toSec - fromSec
if diff < 0 {
return diff + 24 * 60 * 60
} else {
return diff
}
}
func GetSeconds(time Time) int {
return time.Hh * 60 * 60 + time.Mm * 60 + time.Ss
}
希望這可以幫助。
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