func NewLevelDBMembershipIndex(storageRoot string, cacheCapacity, bitsPerBloomFilterEncoded int) (i *LevelDBMembershipIndex, err error) {
leveldbPersistence, err := leveldb.NewLevelDBPersistence(storageRoot, cacheCapacity, bitsPerBloomFilterEncoded)
if err != nil {
return
}
i = &LevelDBMembershipIndex{
persistence: leveldbPersistence,
}
return
}
func NewLevelDBMetricPersistence(baseDirectory string) (*LevelDBMetricPersistence, error) {
log.Printf("Opening LevelDBPersistence storage containers...")
errorChannel := make(chan error, 5)
emission := &LevelDBMetricPersistence{}
var subsystemOpeners = []struct {
name string
opener leveldbOpener
}{
{
"Label Names and Value Pairs by Fingerprint",
func() {
var err error
emission.fingerprintToMetrics, err = storage.NewLevelDBPersistence(baseDirectory+"/label_name_and_value_pairs_by_fingerprint", 1000000, 10)
errorChannel <- err
},
},
{
"Samples by Fingerprint",
func() {
var err error
emission.metricSamples, err = storage.NewLevelDBPersistence(baseDirectory+"/samples_by_fingerprint", 1000000, 10)
errorChannel <- err
},
},
{
"Fingerprints by Label Name",
func() {
var err error
emission.labelNameToFingerprints, err = storage.NewLevelDBPersistence(baseDirectory+"/fingerprints_by_label_name", 1000000, 10)
errorChannel <- err
},
},
{
"Fingerprints by Label Name and Value Pair",
func() {
var err error
emission.labelSetToFingerprints, err = storage.NewLevelDBPersistence(baseDirectory+"/fingerprints_by_label_name_and_value_pair", 1000000, 10)
errorChannel <- err
},
},
{
"Metric Membership Index",
func() {
var err error
emission.metricMembershipIndex, err = index.NewLevelDBMembershipIndex(baseDirectory+"/metric_membership_index", 1000000, 10)
errorChannel <- err
},
},
}
for _, subsystem := range subsystemOpeners {
name := subsystem.name
opener := subsystem.opener
log.Printf("Opening LevelDBPersistence storage container: %s\n", name)
go opener()
}
for i := 0; i < cap(errorChannel); i++ {
openingError := <-errorChannel
if openingError != nil {
log.Printf("Could not open a LevelDBPersistence storage container: %q\n", openingError)
return nil, openingError
}
}
log.Printf("Successfully opened all LevelDBPersistence storage containers.\n")
return emission, nil
}