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aggregation_data.go
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/
aggregation_data.go
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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package view
import (
"math"
"time"
"go.opencensus.io/metric/metricdata"
)
// AggregationData represents an aggregated value from a collection.
// They are reported on the view data during exporting.
// Mosts users won't directly access aggregration data.
type AggregationData interface {
isAggregationData() bool
addSample(v float64, attachments map[string]interface{}, t time.Time)
clone() AggregationData
equal(other AggregationData) bool
toPoint(t metricdata.Type, time time.Time) metricdata.Point
StartTime() time.Time
}
const epsilon = 1e-9
// CountData is the aggregated data for the Count aggregation.
// A count aggregation processes data and counts the recordings.
//
// Most users won't directly access count data.
type CountData struct {
Start time.Time
Value int64
}
func (a *CountData) isAggregationData() bool { return true }
func (a *CountData) addSample(_ float64, _ map[string]interface{}, _ time.Time) {
a.Value = a.Value + 1
}
func (a *CountData) clone() AggregationData {
return &CountData{Value: a.Value, Start: a.Start}
}
func (a *CountData) equal(other AggregationData) bool {
a2, ok := other.(*CountData)
if !ok {
return false
}
return a.Start.Equal(a2.Start) && a.Value == a2.Value
}
func (a *CountData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeCumulativeInt64:
return metricdata.NewInt64Point(t, a.Value)
default:
panic("unsupported metricdata.Type")
}
}
// StartTime returns the start time of the data being aggregated by CountData.
func (a *CountData) StartTime() time.Time {
return a.Start
}
// SumData is the aggregated data for the Sum aggregation.
// A sum aggregation processes data and sums up the recordings.
//
// Most users won't directly access sum data.
type SumData struct {
Start time.Time
Value float64
}
func (a *SumData) isAggregationData() bool { return true }
func (a *SumData) addSample(v float64, _ map[string]interface{}, _ time.Time) {
a.Value += v
}
func (a *SumData) clone() AggregationData {
return &SumData{Value: a.Value, Start: a.Start}
}
func (a *SumData) equal(other AggregationData) bool {
a2, ok := other.(*SumData)
if !ok {
return false
}
return a.Start.Equal(a2.Start) && math.Pow(a.Value-a2.Value, 2) < epsilon
}
func (a *SumData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeCumulativeInt64:
return metricdata.NewInt64Point(t, int64(a.Value))
case metricdata.TypeCumulativeFloat64:
return metricdata.NewFloat64Point(t, a.Value)
default:
panic("unsupported metricdata.Type")
}
}
// StartTime returns the start time of the data being aggregated by SumData.
func (a *SumData) StartTime() time.Time {
return a.Start
}
// DistributionData is the aggregated data for the
// Distribution aggregation.
//
// Most users won't directly access distribution data.
//
// For a distribution with N bounds, the associated DistributionData will have
// N+1 buckets.
type DistributionData struct {
Count int64 // number of data points aggregated
Min float64 // minimum value in the distribution
Max float64 // max value in the distribution
Mean float64 // mean of the distribution
SumOfSquaredDev float64 // sum of the squared deviation from the mean
CountPerBucket []int64 // number of occurrences per bucket
// ExemplarsPerBucket is slice the same length as CountPerBucket containing
// an exemplar for the associated bucket, or nil.
ExemplarsPerBucket []*metricdata.Exemplar
bounds []float64 // histogram distribution of the values
Start time.Time
}
func newDistributionData(agg *Aggregation, t time.Time) *DistributionData {
bucketCount := len(agg.Buckets) + 1
return &DistributionData{
CountPerBucket: make([]int64, bucketCount),
ExemplarsPerBucket: make([]*metricdata.Exemplar, bucketCount),
bounds: agg.Buckets,
Min: math.MaxFloat64,
Max: math.SmallestNonzeroFloat64,
Start: t,
}
}
// Sum returns the sum of all samples collected.
func (a *DistributionData) Sum() float64 { return a.Mean * float64(a.Count) }
func (a *DistributionData) variance() float64 {
if a.Count <= 1 {
return 0
}
return a.SumOfSquaredDev / float64(a.Count-1)
}
func (a *DistributionData) isAggregationData() bool { return true }
// TODO(songy23): support exemplar attachments.
func (a *DistributionData) addSample(v float64, attachments map[string]interface{}, t time.Time) {
if v < a.Min {
a.Min = v
}
if v > a.Max {
a.Max = v
}
a.Count++
a.addToBucket(v, attachments, t)
if a.Count == 1 {
a.Mean = v
return
}
oldMean := a.Mean
a.Mean = a.Mean + (v-a.Mean)/float64(a.Count)
a.SumOfSquaredDev = a.SumOfSquaredDev + (v-oldMean)*(v-a.Mean)
}
func (a *DistributionData) addToBucket(v float64, attachments map[string]interface{}, t time.Time) {
var count *int64
var i int
var b float64
for i, b = range a.bounds {
if v < b {
count = &a.CountPerBucket[i]
break
}
}
if count == nil { // Last bucket.
i = len(a.bounds)
count = &a.CountPerBucket[i]
}
*count++
if exemplar := getExemplar(v, attachments, t); exemplar != nil {
a.ExemplarsPerBucket[i] = exemplar
}
}
func getExemplar(v float64, attachments map[string]interface{}, t time.Time) *metricdata.Exemplar {
if len(attachments) == 0 {
return nil
}
return &metricdata.Exemplar{
Value: v,
Timestamp: t,
Attachments: attachments,
}
}
func (a *DistributionData) clone() AggregationData {
c := *a
c.CountPerBucket = append([]int64(nil), a.CountPerBucket...)
c.ExemplarsPerBucket = append([]*metricdata.Exemplar(nil), a.ExemplarsPerBucket...)
return &c
}
func (a *DistributionData) equal(other AggregationData) bool {
a2, ok := other.(*DistributionData)
if !ok {
return false
}
if a2 == nil {
return false
}
if len(a.CountPerBucket) != len(a2.CountPerBucket) {
return false
}
for i := range a.CountPerBucket {
if a.CountPerBucket[i] != a2.CountPerBucket[i] {
return false
}
}
return a.Start.Equal(a2.Start) &&
a.Count == a2.Count &&
a.Min == a2.Min &&
a.Max == a2.Max &&
math.Pow(a.Mean-a2.Mean, 2) < epsilon && math.Pow(a.variance()-a2.variance(), 2) < epsilon
}
func (a *DistributionData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeCumulativeDistribution:
buckets := []metricdata.Bucket{}
for i := 0; i < len(a.CountPerBucket); i++ {
buckets = append(buckets, metricdata.Bucket{
Count: a.CountPerBucket[i],
Exemplar: a.ExemplarsPerBucket[i],
})
}
bucketOptions := &metricdata.BucketOptions{Bounds: a.bounds}
val := &metricdata.Distribution{
Count: a.Count,
Sum: a.Sum(),
SumOfSquaredDeviation: a.SumOfSquaredDev,
BucketOptions: bucketOptions,
Buckets: buckets,
}
return metricdata.NewDistributionPoint(t, val)
default:
// TODO: [rghetia] when we have a use case for TypeGaugeDistribution.
panic("unsupported metricdata.Type")
}
}
// StartTime returns the start time of the data being aggregated by DistributionData.
func (a *DistributionData) StartTime() time.Time {
return a.Start
}
// LastValueData returns the last value recorded for LastValue aggregation.
type LastValueData struct {
Value float64
}
func (l *LastValueData) isAggregationData() bool {
return true
}
func (l *LastValueData) addSample(v float64, _ map[string]interface{}, _ time.Time) {
l.Value = v
}
func (l *LastValueData) clone() AggregationData {
return &LastValueData{l.Value}
}
func (l *LastValueData) equal(other AggregationData) bool {
a2, ok := other.(*LastValueData)
if !ok {
return false
}
return l.Value == a2.Value
}
func (l *LastValueData) toPoint(metricType metricdata.Type, t time.Time) metricdata.Point {
switch metricType {
case metricdata.TypeGaugeInt64:
return metricdata.NewInt64Point(t, int64(l.Value))
case metricdata.TypeGaugeFloat64:
return metricdata.NewFloat64Point(t, l.Value)
default:
panic("unsupported metricdata.Type")
}
}
// StartTime returns an empty time value as start time is not recorded when using last value
// aggregation.
func (l *LastValueData) StartTime() time.Time {
return time.Time{}
}
// ClearStart clears the Start field from data if present. Useful for testing in cases where the
// start time will be nondeterministic.
func ClearStart(data AggregationData) {
switch data := data.(type) {
case *CountData:
data.Start = time.Time{}
case *SumData:
data.Start = time.Time{}
case *DistributionData:
data.Start = time.Time{}
}
}