88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
// Copyright (c) 2012, Matt T. Proud
|
|
// All rights reserved.
|
|
//
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// gauge.go provides a scalar metric that one can monitor. It is useful for
|
|
// certain cases, such as instantaneous temperature.
|
|
|
|
package metrics
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
)
|
|
|
|
// A gauge metric merely provides an instantaneous representation of a scalar
|
|
// value or an accumulation. For instance, if one wants to expose the current
|
|
// temperature or the hitherto bandwidth used, this would be the metric for such
|
|
// circumstances.
|
|
type GaugeMetric struct {
|
|
value float64
|
|
mutex sync.RWMutex
|
|
}
|
|
|
|
func (metric *GaugeMetric) Humanize() string {
|
|
formatString := "[GaugeMetric; value=%f]"
|
|
|
|
metric.mutex.RLock()
|
|
defer metric.mutex.RUnlock()
|
|
|
|
return fmt.Sprintf(formatString, metric.value)
|
|
}
|
|
|
|
func (metric *GaugeMetric) Set(value float64) float64 {
|
|
metric.mutex.Lock()
|
|
defer metric.mutex.Unlock()
|
|
|
|
metric.value = value
|
|
|
|
return metric.value
|
|
}
|
|
|
|
func (metric *GaugeMetric) IncrementBy(value float64) float64 {
|
|
metric.mutex.Lock()
|
|
defer metric.mutex.Unlock()
|
|
|
|
metric.value += value
|
|
|
|
return metric.value
|
|
}
|
|
|
|
func (metric *GaugeMetric) Increment() float64 {
|
|
return metric.IncrementBy(1)
|
|
}
|
|
|
|
func (metric *GaugeMetric) DecrementBy(value float64) float64 {
|
|
metric.mutex.Lock()
|
|
defer metric.mutex.Unlock()
|
|
|
|
metric.value -= value
|
|
|
|
return metric.value
|
|
}
|
|
|
|
func (metric *GaugeMetric) Decrement() float64 {
|
|
return metric.DecrementBy(1)
|
|
}
|
|
|
|
func (metric *GaugeMetric) Get() float64 {
|
|
metric.mutex.RLock()
|
|
defer metric.mutex.RUnlock()
|
|
|
|
return metric.value
|
|
}
|
|
|
|
func (metric *GaugeMetric) Marshallable() map[string]interface{} {
|
|
metric.mutex.RLock()
|
|
defer metric.mutex.RUnlock()
|
|
|
|
v := make(map[string]interface{}, 2)
|
|
|
|
v["value"] = metric.value
|
|
v["type"] = "gauge"
|
|
|
|
return v
|
|
}
|