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plug.go
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plug.go
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package plug
import (
"sync"
)
type Plug interface {
Start()
Stop()
WaitForStart()
WaitForStop()
IsStarted() bool
}
type plug struct {
start sync.Once
stop sync.Once
startCh chan struct{}
stopCh chan struct{}
}
func NewPlug(started bool) Plug {
p := &plug{
startCh: make(chan struct{}),
stopCh: make(chan struct{}),
}
if started {
p.Start()
}
return p
}
func (p *plug) Start() {
p.start.Do(func() { close(p.startCh) })
}
func (p *plug) Stop() {
p.stop.Do(func() { close(p.stopCh) })
}
func (p *plug) IsStarted() bool {
select {
case <-p.startCh:
return true
default:
return false
}
}
func (p *plug) WaitForStart() {
<-p.startCh
}
func (p *plug) WaitForStop() {
<-p.stopCh
}