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tick.go
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tick.go
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package time
import (
"errors"
"sync/atomic"
"time"
)
// Tick 提供一个长期尽可能周期性的 tick
type Tick interface {
Run()
Stop()
SetCallback(fn TickCallback)
}
type TickCallbackParam struct {
// TODO: 预留字段
}
type TickCallback func(param TickCallbackParam)
// NewTickBeta 新建一个 tick, 目前暂时实现毫秒级, 再低了不支持。此外, 仅支持精确到毫秒, 更低的不支持
//
// 此外, 目前理论上再高并发时会有竞争问题, 建议不要频繁创建销毁
func NewTickBeta(interval time.Duration, callback TickCallback) (Tick, error) {
if interval < time.Millisecond {
return nil, errors.New("intervals lower than 1 millisecond are not supported")
}
if intvl := interval.Round(time.Millisecond); intvl != interval {
return nil, errors.New("only supports accuracy to millisecond")
}
if interval > 5*time.Second {
return nil, errors.New("临时错误: 大于5秒的间隔暂不支持")
}
t := &tickForMilliSeconds{
interval: interval,
callback: callback,
}
return t, nil
}
// ======== tickForMilliSeconds ========
type tickForMilliSeconds struct {
_ noCopy
shouldRun bool
running atomic.Bool
interval time.Duration
callback TickCallback
}
func (t *tickForMilliSeconds) SetCallback(fn TickCallback) {
t.callback = fn
}
func (t *tickForMilliSeconds) Run() {
t.shouldRun = true
if swapped := t.running.CompareAndSwap(false, true); !swapped {
// already running
return
}
go t.doRun()
}
func (t *tickForMilliSeconds) Stop() {
t.shouldRun = false
}
func (t *tickForMilliSeconds) doRun() {
next := UpTime()
for {
if !t.shouldRun {
t.running.Store(false)
return
}
callback := t.callback
if callback != nil {
go callback(TickCallbackParam{})
}
next += t.interval
for next-UpTime() < 0 {
next += t.interval
}
time.Sleep(next - UpTime())
}
}