You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
1.4 KiB
75 lines
1.4 KiB
package timer
|
|
|
|
import (
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
/*
|
|
ThrottleTimer fires an event at most "dur" after each .Set() call.
|
|
If a short burst of .Set() calls happens, ThrottleTimer fires once.
|
|
If a long continuous burst of .Set() calls happens, ThrottleTimer fires
|
|
at most once every "dur".
|
|
*/
|
|
type ThrottleTimer struct {
|
|
Name string
|
|
Ch chan struct{}
|
|
quit chan struct{}
|
|
dur time.Duration
|
|
|
|
mtx sync.Mutex
|
|
timer *time.Timer
|
|
isSet bool
|
|
}
|
|
|
|
func NewThrottleTimer(name string, dur time.Duration) *ThrottleTimer {
|
|
var ch = make(chan struct{})
|
|
var quit = make(chan struct{})
|
|
var t = &ThrottleTimer{Name: name, Ch: ch, dur: dur, quit: quit}
|
|
t.mtx.Lock()
|
|
t.timer = time.AfterFunc(dur, t.fireRoutine)
|
|
t.mtx.Unlock()
|
|
t.timer.Stop()
|
|
return t
|
|
}
|
|
|
|
func (t *ThrottleTimer) fireRoutine() {
|
|
t.mtx.Lock()
|
|
defer t.mtx.Unlock()
|
|
select {
|
|
case t.Ch <- struct{}{}:
|
|
t.isSet = false
|
|
case <-t.quit:
|
|
// do nothing
|
|
default:
|
|
t.timer.Reset(t.dur)
|
|
}
|
|
}
|
|
|
|
func (t *ThrottleTimer) Set() {
|
|
t.mtx.Lock()
|
|
defer t.mtx.Unlock()
|
|
if !t.isSet {
|
|
t.isSet = true
|
|
t.timer.Reset(t.dur)
|
|
}
|
|
}
|
|
|
|
func (t *ThrottleTimer) Unset() {
|
|
t.mtx.Lock()
|
|
defer t.mtx.Unlock()
|
|
t.isSet = false
|
|
t.timer.Stop()
|
|
}
|
|
|
|
// For ease of .Stop()'ing services before .Start()'ing them,
|
|
// we ignore .Stop()'s on nil ThrottleTimers
|
|
func (t *ThrottleTimer) Stop() bool {
|
|
if t == nil {
|
|
return false
|
|
}
|
|
close(t.quit)
|
|
t.mtx.Lock()
|
|
defer t.mtx.Unlock()
|
|
return t.timer.Stop()
|
|
}
|