Struct orderedFlightGroup

groupcache_test.go:371–376

orderedFlightGroup allows the caller to force the schedule of when orig.Do will be called. This is useful to serialize calls such that singleflight cannot dedup them.

// orig.Do will be called.  This is useful to serialize calls such
// that singleflight cannot dedup them.
type orderedFlightGroup struct {
	mu     sync.Mutex
	stage1 chan bool
	stage2 chan bool
	orig   flightGroup
}

func (g *orderedFlightGroup) Do(key string, fn func() (interface{}, error)) (interface{}, error) {
	<-g.stage1