/
boundaries.go
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/
boundaries.go
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// 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 zpages // import "go.opentelemetry.io/contrib/zpages"
import (
"sort"
"time"
)
const zeroDuration = time.Duration(0)
const maxDuration = time.Duration(1<<63 - 1)
var defaultBoundaries = newBoundaries([]time.Duration{
10 * time.Microsecond,
100 * time.Microsecond,
time.Millisecond,
10 * time.Millisecond,
100 * time.Millisecond,
time.Second,
10 * time.Second,
100 * time.Second,
})
// boundaries represents the interval bounds for the latency based samples.
type boundaries struct {
durations []time.Duration
}
// newBoundaries returns a new boundaries.
func newBoundaries(durations []time.Duration) *boundaries {
sort.Slice(durations, func(i, j int) bool {
return durations[i] < durations[j]
})
return &boundaries{durations: durations}
}
// numBuckets returns the number of buckets needed for these boundaries.
func (lb boundaries) numBuckets() int {
return len(lb.durations) + 1
}
// getBucketIndex returns the appropriate bucket index for a given latency.
func (lb boundaries) getBucketIndex(latency time.Duration) int {
i := 0
for i < len(lb.durations) && latency >= lb.durations[i] {
i++
}
return i
}