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gauge.go
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gauge.go
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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package aggregation
import (
"math"
"github.com/m3db/m3/src/metrics/aggregation"
)
const (
minFloat64 = -math.MaxFloat64
)
// Gauge aggregates gauge values.
type Gauge struct {
Options
last float64
sum float64
sumSq float64
count int64
max float64
min float64
}
// NewGauge creates a new gauge.
func NewGauge(opts Options) Gauge {
return Gauge{
Options: opts,
max: minFloat64,
min: math.MaxFloat64,
}
}
// Update updates the gauge value.
func (g *Gauge) Update(value float64) {
g.last = value
g.sum += value
g.count++
if g.max < value {
g.max = value
}
if g.min > value {
g.min = value
}
if g.HasExpensiveAggregations {
g.sumSq += value * value
}
}
// Last returns the last value received.
func (g *Gauge) Last() float64 { return g.last }
// Count returns the number of values received.
func (g *Gauge) Count() int64 { return g.count }
// Sum returns the sum of gauge values.
func (g *Gauge) Sum() float64 { return g.sum }
// SumSq returns the squared sum of gauge values.
func (g *Gauge) SumSq() float64 { return g.sumSq }
// Mean returns the mean gauge value.
func (g *Gauge) Mean() float64 {
if g.count == 0 {
return 0.0
}
return g.sum / float64(g.count)
}
// Stdev returns the standard deviation gauge value.
func (g *Gauge) Stdev() float64 {
return stdev(g.count, g.sumSq, g.sum)
}
// Min returns the minimum gauge value.
func (g *Gauge) Min() float64 { return g.min }
// Max returns the maximum gauge value.
func (g *Gauge) Max() float64 { return g.max }
// ValueOf returns the value for the aggregation type.
func (g *Gauge) ValueOf(aggType aggregation.Type) float64 {
switch aggType {
case aggregation.Last:
return g.Last()
case aggregation.Min:
return g.Min()
case aggregation.Max:
return g.Max()
case aggregation.Mean:
return g.Mean()
case aggregation.Count:
return float64(g.Count())
case aggregation.Sum:
return g.Sum()
case aggregation.SumSq:
return g.SumSq()
case aggregation.Stdev:
return g.Stdev()
default:
return 0
}
}
// Close closes the gauge.
func (g *Gauge) Close() {}