/
system_clock.go
49 lines (42 loc) · 1016 Bytes
/
system_clock.go
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package stgcommon
import (
"time"
"sync/atomic"
"github.com/ttstringiot/golangiot/stgcommon/logger"
)
type SystemClock struct {
precision int64
now int64
closeChan chan bool
}
func NewSystemClock(precision int64) *SystemClock {
systemClock := &SystemClock{
precision: precision,
now: time.Now().UnixNano() / 1000000,
closeChan: make(chan bool, 1),
}
return systemClock
}
func (self *SystemClock) scheduleClockUpdating(tick *time.Ticker) {
for {
select {
case <-self.closeChan:
tick.Stop()
close(self.closeChan)
logger.Info("close system clock service")
return
case <-tick.C:
atomic.StoreInt64(&self.now, time.Now().UnixNano()/1000000)
}
}
}
func (self *SystemClock) Now() int64 {
return self.now
}
func (self *SystemClock) Start() {
tick := time.NewTicker(time.Duration(self.precision) * time.Millisecond)
self.scheduleClockUpdating(tick)
}
func (self *SystemClock) Shutdown() {
self.closeChan <- true
}