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counter.go
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counter.go
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package telemetry
import (
"sync"
"time"
)
//Counter - A running total of values provided to it, over a time period
type Counter struct {
Name string
value float64
points map[time.Time]float64
duration time.Duration
lock sync.Mutex
}
//NewCounter - Create new Counter metric with a duration for keeping points
func NewCounter(tel *Telemetry, name string, duration time.Duration) *Counter {
count := Counter{
Name: name,
value: 0,
points: make(map[time.Time]float64),
duration: duration,
}
tel.lock.Lock()
defer tel.lock.Unlock()
tel.registry[name] = &count
return &count
}
//Add - Add a value to the metric
func (c *Counter) Add(tel *Telemetry, value float64) error {
tel.lock.Lock()
c.lock.Lock()
tel.registry[c.Name].(*Counter).points[time.Now()] = value
tel.lock.Unlock()
c.lock.Unlock()
c.Maintain()
return nil
}
//Get - Fetch the metric value
func (c *Counter) Get(tel *Telemetry) float64 {
c.Maintain()
return tel.registry[c.Name].(*Counter).value
}
//GetName - get the name of the metric
func (c *Counter) GetName() string {
return c.Name
}
//Maintain - maintain metric value
func (c *Counter) Maintain() {
c.lock.Lock()
defer c.lock.Unlock()
points := make(map[time.Time]float64)
for pointTime, point := range c.points {
if time.Since(pointTime) < c.duration {
points[pointTime] = point
}
}
c.points = points
var count float64
for _, point := range c.points {
count = count + point
}
c.value = count
}