// CreateMeasurementIndexIfNotExists creates or retrieves an in memory index object for the measurement
func (d *DatabaseIndex) CreateMeasurementIndexIfNotExists(name string) *Measurement {
name = escape.UnescapeString(name)
// See if the measurement exists using a read-lock
d.mu.RLock()
m := d.measurements[name]
if m != nil {
d.mu.RUnlock()
return m
}
d.mu.RUnlock()
// Doesn't exist, so lock the index to create it
d.mu.Lock()
defer d.mu.Unlock()
// Make sure it was created in between the time we released our read-lock
// and acquire the write lock
m = d.measurements[name]
if m == nil {
m = NewMeasurement(name)
d.measurements[name] = m
d.statMap.Add(statDatabaseMeasurements, 1)
}
return m
}
// CreateMeasurementIndexIfNotExists creates or retrieves an in memory index object for the measurement
func (d *DatabaseIndex) CreateMeasurementIndexIfNotExists(name string) *Measurement {
name = escape.UnescapeString(name)
m := d.measurements[name]
if m == nil {
m = NewMeasurement(name, d)
d.measurements[name] = m
}
return m
}
// MeasurementFromSeriesKey returns the name of the measurement from a key that
// contains a measurement name.
func MeasurementFromSeriesKey(key string) string {
// Ignoring the error because the func returns "missing fields"
k, _, _ := models.ParseKey(key)
return escape.UnescapeString(k)
}