func startPStoreLoops(
stats *datastructs.ApplicationStatuses,
consumerBuilders []*pstore.ConsumerWithMetricsBuilder,
logger *log.Logger,
maybeNilCoordBuilder coordinatorBuilderType) []*totalCountType {
result := make([]*totalCountType, len(consumerBuilders))
for i := range result {
pstoreHandler := newPStoreHandler(
stats.ApplicationList(),
consumerBuilders[i],
maybeNilCoordBuilder)
result[i] = pstoreHandler.TotalCount()
var attributes pstore.ConsumerAttributes
pstoreHandler.Attributes(&attributes)
refreshRate := *fPStoreUpdateFrequency
if attributes.RollUpSpan > 0 {
refreshRate = attributes.RollUpSpan
}
if err := pstoreHandler.RegisterMetrics(); err != nil {
log.Fatal(err)
}
go func(handler *pstoreHandlerType, refreshRate time.Duration) {
// persistent storage writing goroutine. Write every 30s by default.
// Notice that this single goroutine handles all the persistent
// storage writing as multiple goroutines must not access the
// pstoreHandler instance. accessing pstoreHandler metrics is the
// one exception to this rule.
for {
metricStore := stats.Store()
writeTime := time.Now()
handler.StartVisit()
metricStore.VisitAllEndpoints(handler)
handler.EndVisit(metricStore)
writeDuration := time.Now().Sub(writeTime)
if writeDuration < refreshRate {
time.Sleep(refreshRate - writeDuration)
}
}
}(pstoreHandler, refreshRate)
}
return result
}
