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46 lines
867 B
46 lines
867 B
package common
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import (
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"sync/atomic"
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"time"
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)
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/*
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Throttler sends a struct{}{} to .Ch "dur" after the last .Set().
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It's good for ensuring that something happens last after a burst of events.
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*/
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type Throttler struct {
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Ch chan struct{}
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quit chan struct{}
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dur time.Duration
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timer *time.Timer
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isSet uint32
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}
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func NewThrottler(dur time.Duration) *Throttler {
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var ch = make(chan struct{})
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var quit = make(chan struct{})
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var t = &Throttler{Ch: ch, dur: dur, quit: quit}
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t.timer = time.AfterFunc(dur, t.fireHandler)
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t.timer.Stop()
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return t
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}
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func (t *Throttler) fireHandler() {
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select {
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case t.Ch <- struct{}{}:
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atomic.StoreUint32(&t.isSet, 0)
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case <-t.quit:
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}
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}
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func (t *Throttler) Set() {
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if atomic.CompareAndSwapUint32(&t.isSet, 0, 1) {
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t.timer.Reset(t.dur)
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}
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}
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func (t *Throttler) Stop() bool {
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close(t.quit)
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return t.timer.Stop()
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}
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