90 lines
2.3 KiB
Go
90 lines
2.3 KiB
Go
// 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/internal/exemplar"
|
|
"go.opentelemetry.io/otel/sdk/metric/metricdata"
|
|
)
|
|
|
|
// datapoint is timestamped measurement data.
|
|
type datapoint[N int64 | float64] struct {
|
|
timestamp time.Time
|
|
value N
|
|
res exemplar.Reservoir[N]
|
|
}
|
|
|
|
func newLastValue[N int64 | float64](limit int, r func() exemplar.Reservoir[N]) *lastValue[N] {
|
|
return &lastValue[N]{
|
|
newRes: r,
|
|
limit: newLimiter[datapoint[N]](limit),
|
|
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
|
|
|
|
newRes func() exemplar.Reservoir[N]
|
|
limit limiter[datapoint[N]]
|
|
values map[attribute.Set]datapoint[N]
|
|
}
|
|
|
|
func (s *lastValue[N]) measure(ctx context.Context, value N, fltrAttr attribute.Set, droppedAttr []attribute.KeyValue) {
|
|
t := now()
|
|
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
|
|
attr := s.limit.Attributes(fltrAttr, s.values)
|
|
d, ok := s.values[attr]
|
|
if !ok {
|
|
d.res = s.newRes()
|
|
}
|
|
|
|
d.timestamp = t
|
|
d.value = value
|
|
d.res.Offer(ctx, t, value, droppedAttr)
|
|
|
|
s.values[attr] = d
|
|
}
|
|
|
|
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
|
|
v.res.Collect(&(*dest)[i].Exemplars)
|
|
// Do not report stale values.
|
|
delete(s.values, a)
|
|
i++
|
|
}
|
|
}
|