189 lines
4.1 KiB
Go
189 lines
4.1 KiB
Go
package util
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import (
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"container/list"
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"sync"
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"time"
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)
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// 时间轮定时器
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type TimeWheel struct {
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interval time.Duration // 时间轮间隔(每格时间)
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ticker *time.Ticker // 定时器
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slots []*list.List // 时间轮槽
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curSlot int // 当前槽位置
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slotNum int // 槽数量
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taskMap map[string]*Task // 任务映射表
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sync.Mutex // 互斥锁
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stop chan bool // 停止信号
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}
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// 定时任务
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type Task struct {
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delay time.Duration // 延迟时间
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circle int // 时间轮转动圈数
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key string // 任务唯一标识
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callback func() // 回调函数
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repeat bool // 是否重复执行
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interval time.Duration // 重复执行的时间间隔
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}
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var (
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defaultTimeWheel *TimeWheel
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once sync.Once
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)
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// 初始化默认时间轮,1秒一格,共60格
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func initDefaultTimeWheel() {
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once.Do(func() {
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defaultTimeWheel = NewTimeWheel(time.Second, 60)
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defaultTimeWheel.Start()
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})
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}
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// 获取默认时间轮实例
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func GetDefaultTimeWheel() *TimeWheel {
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initDefaultTimeWheel()
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return defaultTimeWheel
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}
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// 静态方法:添加一次性任务
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func AddTask(key string, delay time.Duration, callback func()) {
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initDefaultTimeWheel()
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defaultTimeWheel.AddTask(key, delay, callback)
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}
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// 静态方法:添加循环任务
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func AddCycleTask(key string, delay time.Duration, interval time.Duration, callback func()) {
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initDefaultTimeWheel()
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defaultTimeWheel.AddCycleTask(key, delay, interval, callback)
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}
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// 静态方法:删除任务
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func RemoveTask(key string) {
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initDefaultTimeWheel()
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defaultTimeWheel.RemoveTask(key)
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}
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// 静态方法:停止时间轮
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func StopTimeWheel() {
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if defaultTimeWheel != nil {
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defaultTimeWheel.Stop()
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}
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}
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// 创建时间轮
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func NewTimeWheel(interval time.Duration, slotNum int) *TimeWheel {
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tw := &TimeWheel{
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interval: interval,
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slots: make([]*list.List, slotNum),
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taskMap: make(map[string]*Task),
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slotNum: slotNum,
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stop: make(chan bool),
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}
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for i := 0; i < slotNum; i++ {
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tw.slots[i] = list.New()
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}
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return tw
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}
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// 启动时间轮
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func (tw *TimeWheel) Start() {
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tw.ticker = time.NewTicker(tw.interval)
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go tw.run()
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}
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// 停止时间轮
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func (tw *TimeWheel) Stop() {
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tw.ticker.Stop()
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tw.stop <- true
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}
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// 添加普通任务
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func (tw *TimeWheel) AddTask(key string, delay time.Duration, callback func()) {
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tw.addTask(key, delay, callback, false, 0)
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}
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// 添加循环任务
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func (tw *TimeWheel) AddCycleTask(key string, delay time.Duration, interval time.Duration, callback func()) {
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tw.addTask(key, delay, callback, true, interval)
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}
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// 内部添加任务方法
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func (tw *TimeWheel) addTask(key string, delay time.Duration, callback func(), repeat bool, interval time.Duration) {
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tw.Lock()
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defer tw.Unlock()
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circle := int(delay / (tw.interval * time.Duration(tw.slotNum)))
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pos := (tw.curSlot + int(delay/tw.interval)) % tw.slotNum
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task := &Task{
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delay: delay,
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circle: circle,
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key: key,
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callback: callback,
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repeat: repeat,
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interval: interval,
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}
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tw.slots[pos].PushBack(task)
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tw.taskMap[key] = task
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}
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// 删除任务
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func (tw *TimeWheel) RemoveTask(key string) {
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tw.Lock()
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defer tw.Unlock()
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delete(tw.taskMap, key)
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}
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// 运行时间轮
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func (tw *TimeWheel) run() {
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for {
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select {
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case <-tw.ticker.C:
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tw.Lock()
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l := tw.slots[tw.curSlot]
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for e := l.Front(); e != nil; {
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task := e.Value.(*Task)
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if task.circle > 0 {
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task.circle--
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e = e.Next()
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continue
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}
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go task.callback()
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next := e.Next()
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// 处理循环任务
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if task.repeat {
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// 重新计算下一次执行的位置和圈数
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circle := int(task.interval / (tw.interval * time.Duration(tw.slotNum)))
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pos := (tw.curSlot + int(task.interval/tw.interval)) % tw.slotNum
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task.circle = circle
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// 从当前槽中移除
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l.Remove(e)
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// 添加到新的槽位置
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tw.slots[pos].PushBack(task)
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} else {
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// 一次性任务,直接删除
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l.Remove(e)
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delete(tw.taskMap, task.key)
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}
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e = next
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}
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tw.curSlot = (tw.curSlot + 1) % tw.slotNum
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tw.Unlock()
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case <-tw.stop:
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return
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}
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}
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}
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