71 lines
3.1 KiB
Go
71 lines
3.1 KiB
Go
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package storage
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import (
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"math"
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"sort"
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"github.com/go-flucky/flucky/pkg/internal/format"
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"github.com/go-flucky/flucky/pkg/types"
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)
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// Compression the measured values. The system checks whether the measured values
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// of the same type correspond to those of the predecessor. If this is the case,
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// the current value is discarded and the validity date of the previous value is
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// set to that of the current value. This means that no information is lost.
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// Only the validity period of the measured value is increased.
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func Compression(measuredValues []*types.MeasuredValue) []*types.MeasuredValue {
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compressedMeasuredValues := make([]*types.MeasuredValue, 0)
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lastMeasuredValuesBySensors := make(map[string]map[types.MeasuredValueType]*types.MeasuredValue, 0)
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// Sort all measured values according to the start time of the validity date
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// in order to successfully implement the subsequent compression.
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sort.SliceStable(measuredValues, func(i int, j int) bool {
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return measuredValues[i].FromDate.Before(measuredValues[j].TillDate)
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})
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now := format.FormatedTime()
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for _, measuredValue := range measuredValues {
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if _, ok := lastMeasuredValuesBySensors[measuredValue.SensorID]; !ok {
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lastMeasuredValuesBySensors[measuredValue.SensorID] = make(map[types.MeasuredValueType]*types.MeasuredValue, 0)
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}
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if _, ok := lastMeasuredValuesBySensors[measuredValue.SensorID][measuredValue.ValueType]; !ok {
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lastMeasuredValuesBySensors[measuredValue.SensorID][measuredValue.ValueType] = measuredValue
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continue
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}
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if lastMeasuredValuesBySensors[measuredValue.SensorID][measuredValue.ValueType].Value == measuredValue.Value {
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lastMeasuredValuesBySensors[measuredValue.SensorID][measuredValue.ValueType].TillDate = measuredValue.TillDate
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lastMeasuredValuesBySensors[measuredValue.SensorID][measuredValue.ValueType].UpdateDate = &now
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} else if lastMeasuredValuesBySensors[measuredValue.SensorID][measuredValue.ValueType].Value != measuredValue.Value {
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compressedMeasuredValues = append(compressedMeasuredValues, lastMeasuredValuesBySensors[measuredValue.SensorID][measuredValue.ValueType])
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delete(lastMeasuredValuesBySensors[measuredValue.SensorID], measuredValue.ValueType)
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lastMeasuredValuesBySensors[measuredValue.SensorID][measuredValue.ValueType] = measuredValue
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}
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}
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// Copy all remaining entries from the map into the cache array
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for _, lastMeasuredValuesBySensor := range lastMeasuredValuesBySensors {
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for _, measuredValueType := range types.MeasuredValueTypes {
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if measuredValue, ok := lastMeasuredValuesBySensor[measuredValueType]; ok {
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compressedMeasuredValues = append(compressedMeasuredValues, measuredValue)
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}
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}
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}
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// Sort all measured values again to include the measured values from the
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// cache.
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sort.SliceStable(compressedMeasuredValues, func(i int, j int) bool {
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return compressedMeasuredValues[i].FromDate.Before(compressedMeasuredValues[j].FromDate)
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})
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return compressedMeasuredValues
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}
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func Round(measuredValues []*types.MeasuredValue, round float64) {
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for _, measuredValue := range measuredValues {
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measuredValue.Value = math.Round(measuredValue.Value/round) * round
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}
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}
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