forked from census-instrumentation/opencensus-go
/
aggregation_data.go
230 lines (194 loc) · 5.58 KB
/
aggregation_data.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
// 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"
)
// 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)
clone() AggregationData
equal(other AggregationData) bool
}
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 int64
func newCountData(v int64) *CountData {
tmp := CountData(v)
return &tmp
}
func (a *CountData) isAggregationData() bool { return true }
func (a *CountData) addSample(_ float64) {
*a = *a + 1
}
func (a *CountData) clone() AggregationData {
return newCountData(int64(*a))
}
func (a *CountData) equal(other AggregationData) bool {
a2, ok := other.(*CountData)
if !ok {
return false
}
return int64(*a) == int64(*a2)
}
// 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 float64
func newSumData(v float64) *SumData {
tmp := SumData(v)
return &tmp
}
func (a *SumData) isAggregationData() bool { return true }
func (a *SumData) addSample(f float64) {
*a += SumData(f)
}
func (a *SumData) clone() AggregationData {
return newSumData(float64(*a))
}
func (a *SumData) equal(other AggregationData) bool {
a2, ok := other.(*SumData)
if !ok {
return false
}
return math.Pow(float64(*a)-float64(*a2), 2) < epsilon
}
// MeanData is the aggregated data for the Mean aggregation.
// A mean aggregation processes data and maintains the mean value.
//
// Most users won't directly access mean data.
type MeanData struct {
Count int64 // number of data points aggregated
Mean float64 // mean of all data points
}
func newMeanData(mean float64, count int64) *MeanData {
return &MeanData{
Mean: mean,
Count: count,
}
}
// Sum returns the sum of all samples collected.
func (a *MeanData) Sum() float64 { return a.Mean * float64(a.Count) }
func (a *MeanData) isAggregationData() bool { return true }
func (a *MeanData) addSample(f float64) {
a.Count++
if a.Count == 1 {
a.Mean = f
return
}
a.Mean = a.Mean + (f-a.Mean)/float64(a.Count)
}
func (a *MeanData) clone() AggregationData {
return newMeanData(a.Mean, a.Count)
}
func (a *MeanData) equal(other AggregationData) bool {
a2, ok := other.(*MeanData)
if !ok {
return false
}
return a.Count == a2.Count && math.Pow(a.Mean-a2.Mean, 2) < epsilon
}
// DistributionData is the aggregated data for the
// Distribution aggregation.
//
// Most users won't directly access distribution data.
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
bounds []float64 // histogram distribution of the values
}
func newDistributionData(bounds []float64) *DistributionData {
return &DistributionData{
CountPerBucket: make([]int64, len(bounds)+1),
bounds: bounds,
Min: math.MaxFloat64,
Max: math.SmallestNonzeroFloat64,
}
}
// 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 }
func (a *DistributionData) addSample(f float64) {
if f < a.Min {
a.Min = f
}
if f > a.Max {
a.Max = f
}
a.Count++
a.incrementBucketCount(f)
if a.Count == 1 {
a.Mean = f
return
}
oldMean := a.Mean
a.Mean = a.Mean + (f-a.Mean)/float64(a.Count)
a.SumOfSquaredDev = a.SumOfSquaredDev + (f-oldMean)*(f-a.Mean)
}
func (a *DistributionData) incrementBucketCount(f float64) {
if len(a.bounds) == 0 {
a.CountPerBucket[0]++
return
}
for i, b := range a.bounds {
if f < b {
a.CountPerBucket[i]++
return
}
}
a.CountPerBucket[len(a.bounds)]++
}
func (a *DistributionData) clone() AggregationData {
counts := make([]int64, len(a.CountPerBucket))
copy(counts, a.CountPerBucket)
c := *a
c.CountPerBucket = counts
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.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
}