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counter_with_rates.go
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counter_with_rates.go
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// Copyright 2016 The Cockroach 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 metric
import "time"
// A TimeScale is a named duration.
type TimeScale struct {
name string
d time.Duration
}
// DefaultTimeScales are the durations used for helpers which create windowed
// metrics in bulk (such as Rates).
var DefaultTimeScales = []TimeScale{Scale1M, Scale10M, Scale1H}
var (
// Scale1M is a 1 minute window for windowed stats (e.g. Rates and Histograms).
Scale1M = TimeScale{"1m", 1 * time.Minute}
// Scale10M is a 10 minute window for windowed stats (e.g. Rates and Histograms).
Scale10M = TimeScale{"10m", 10 * time.Minute}
// Scale1H is a 1 hour window for windowed stats (e.g. Rates and Histograms).
Scale1H = TimeScale{"1h", time.Hour}
)
// CounterWithRates is a counter and associated EWMA backed rates at different
// time scales (which are ignored when visiting the object, and are thus not
// exported).
type CounterWithRates struct {
*Counter
Rates map[TimeScale]*Rate
}
// NewCounterWithRates registers and returns a new Counter along with some
// a set of EWMA-based rates at time scales specified by DefaultTimeScales.
// These rates are provided for convenience and are not exported to metrics
// frameworks. If they are not required, a Counter should be used instead.
func NewCounterWithRates(metadata Metadata) *CounterWithRates {
scales := DefaultTimeScales
es := make(map[TimeScale]*Rate)
for _, scale := range scales {
es[scale] = NewRate(scale.d)
}
c := NewCounter(
Metadata{
Name: metadata.Name,
Help: metadata.Help,
labels: metadata.labels,
})
return &CounterWithRates{Counter: c, Rates: es}
}
// Inc increments the counter.
func (c *CounterWithRates) Inc(v int64) {
c.Counter.Inc(v)
for _, e := range c.Rates {
e.Add(float64(v))
}
}