1st

database/metric.go

@@ -0,0 +1,71 @@
+package database
+
+import (
+	octopus "gordenko.dev/dima/qb"
+	"gordenko.dev/dima/qb/chunkenc"
+	"gordenko.dev/dima/qb/conbuf"
+)
+
+// METRIC
+
+type _metric struct {
+	MetricType    octopus.MetricType
+	FracDigits    byte
+	RootPageNo    uint32
+	LastPageNo    uint32
+	SinceValue    float64
+	Since         uint32
+	UntilValue    float64
+	Until         uint32
+	TimestampsBuf *conbuf.ContinuousBuffer
+	ValuesBuf     *conbuf.ContinuousBuffer
+	Timestamps    octopus.TimestampCompressor
+	Values        octopus.ValueCompressor
+}
+
+func (s *_metric) ReinitBy(timestamp uint32, value float64) {
+	s.TimestampsBuf = conbuf.New(nil)
+	s.ValuesBuf = conbuf.New(nil)
+	//
+	s.Timestamps = chunkenc.NewReverseTimeDeltaOfDeltaCompressor(
+		s.TimestampsBuf, 0)
+
+	if s.MetricType == octopus.Cumulative {
+		s.Values = chunkenc.NewReverseCumulativeDeltaCompressor(
+			s.ValuesBuf, 0, s.FracDigits)
+	} else {
+		s.Values = chunkenc.NewReverseInstantDeltaCompressor(
+			s.ValuesBuf, 0, s.FracDigits)
+	}
+
+	s.Timestamps.Append(timestamp)
+	s.Values.Append(value)
+
+	s.Since = timestamp
+	s.SinceValue = value
+	s.Until = timestamp
+	s.UntilValue = value
+}
+
+func (s *_metric) DeleteMeasures() {
+	s.TimestampsBuf = conbuf.New(nil)
+	s.ValuesBuf = conbuf.New(nil)
+	//
+	s.Timestamps = chunkenc.NewReverseTimeDeltaOfDeltaCompressor(
+		s.TimestampsBuf, 0)
+
+	if s.MetricType == octopus.Cumulative {
+		s.Values = chunkenc.NewReverseCumulativeDeltaCompressor(
+			s.ValuesBuf, 0, s.FracDigits)
+	} else {
+		s.Values = chunkenc.NewReverseInstantDeltaCompressor(
+			s.ValuesBuf, 0, s.FracDigits)
+	}
+
+	s.RootPageNo = 0
+	s.LastPageNo = 0
+	s.Since = 0
+	s.SinceValue = 0
+	s.Until = 0
+	s.UntilValue = 0
+}