一、前言
1、go有現成的週期定時器和定時器,但是沒有定時週期
2、基於在未來某個時刻後進行週期循環,於是有了定時週期
3、本文秒級精度的定時器,存在幾個指令時間的誤差
二、實現
1、基礎代碼
package timer
import (
"time"
)
//阻塞循環定時器
func tickerDone(interval int, function func()) {
eventsTick := time.NewTicker(time.Duration(interval) * time.Second)
defer eventsTick.Stop()
for {
select {
case <-eventsTick.C:
function()
}
}
}
//阻塞定時器
func timerDone(interval int, function func()) {
eventsTick := time.NewTimer(time.Duration(interval) * time.Second)
defer eventsTick.Stop()
<-eventsTick.C
function()
}
2、週期定時器
方式一:
const (
Simple_time_timeTemplate = "2006-01-02 15:04:05"
)
//指定時間定時循環
//intput:timePeriod 時間週期 單位秒
//intput:startTime 定時開始時間
//intput:timeTemplate 時間格式模板
//intput: callfunc 回調函數
func Ticker1(timePeriod int, startTime, timeTemplate string, callFunc func()) error {
if timeTemplate == "" {
timeTemplate = Simple_time_timeTemplate
}
startTimeStamp, err := time.ParseInLocation(timeTemplate, startTime, time.Local)
if err != nil {
return err
}
if timePeriod <= 0 {
return err
}
go func() {
nowTimeStamp := time.Now()
interval := startTimeStamp.Second() - (nowTimeStamp.Second())
if interval < 0 {
interval = timePeriod + interval%timePeriod
}
time.Sleep(time.Duration(interval) * time.Second)
tickerDone(timePeriod, func() {
callFunc()
})
}()
return nil
}
方式二:
//指定時間定時循環
//intput:timePeriod 時間週期
//intput:startTime 定時開始時間
//intput:timeTemplate 時間格式模板
//intput: callfunc 回調函數
func Ticker2(timePeriod int, startTime, timeTemplate string, callFunc func()) error {
if timeTemplate == "" {
timeTemplate = Simple_time_timeTemplate
}
startTimeStamp, err := time.ParseInLocation(timeTemplate, startTime, time.Local)
if err != nil {
return err
}
if timePeriod <= 0 {
return err
}
go func() {
nowTimeStamp := time.Now()
interval := startTimeStamp.Second() - nowTimeStamp.Second()
if interval < 0 {
interval = timePeriod + interval%timePeriod
}
if interval != 0 {
timerDone(interval, callFunc)
}
tickerDone(timePeriod, callFunc)
}()
return nil
}
三、單元測試
package timer
import (
"fmt"
"testing"
"time"
)
func TestTicker1(t *testing.T) {
//從2019-09-17 19:14:30起 每1秒調用方法
Ticker1(1, "2019-09-17 19:14:30", Simple_time_timeTemplate, func() {
fmt.Println("Hello", time.Now())
})
select {}
}
func TestTicker2(t *testing.T) {
//從2019-09-17 19:14:30起 每1秒調用方法
Ticker2(1, "2019-10-20 10:00:00", Simple_time_timeTemplate, func() {
fmt.Println("Hello", time.Now())
})
select {}
}
func TestTimerDo(t *testing.T) {
timerDone(20, func() {
fmt.Println("Hello", time.Now())
})
}
func TestTickerDo(t *testing.T) {
tickerDone(20, func() {
fmt.Println("Hello", time.Now())
})
}