blob: 6af2d606141e4cd7ecc9f81ab47c889bd1d4c997 (
plain)
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
|
// Copyright The OpenTelemetry 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 aggregate // import "go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
import (
"context"
"sync"
"time"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
)
// datapoint is timestamped measurement data.
type datapoint[N int64 | float64] struct {
timestamp time.Time
value N
}
func newLastValue[N int64 | float64]() *lastValue[N] {
return &lastValue[N]{values: make(map[attribute.Set]datapoint[N])}
}
// lastValue summarizes a set of measurements as the last one made.
type lastValue[N int64 | float64] struct {
sync.Mutex
values map[attribute.Set]datapoint[N]
}
func (s *lastValue[N]) measure(ctx context.Context, value N, attr attribute.Set) {
d := datapoint[N]{timestamp: now(), value: value}
s.Lock()
s.values[attr] = d
s.Unlock()
}
func (s *lastValue[N]) computeAggregation(dest *[]metricdata.DataPoint[N]) {
s.Lock()
defer s.Unlock()
n := len(s.values)
*dest = reset(*dest, n, n)
var i int
for a, v := range s.values {
(*dest)[i].Attributes = a
// The event time is the only meaningful timestamp, StartTime is
// ignored.
(*dest)[i].Time = v.timestamp
(*dest)[i].Value = v.value
// Do not report stale values.
delete(s.values, a)
i++
}
}
|
