/
tblkaverage.go
87 lines (65 loc) · 1.39 KB
/
tblkaverage.go
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package aggregator
import (
"sync"
"time"
)
type TimeBlockAverage struct {
windowSize time.Duration
values []float64
windowMtx *sync.Mutex
startMtx *sync.RWMutex
windowActive bool
}
func init() {
RegisterFactory("timeblockavg", NewTimeBlockAverage)
}
func (ta *TimeBlockAverage) Add(value float64) (bool, float64) {
ta.windowMtx.Lock()
ta.values = append(ta.values, value)
ta.windowMtx.Unlock()
if ta.startWindow() {
time.Sleep(ta.windowSize * time.Millisecond)
return true, ta.average()
} else {
return false, 0
}
}
func (ta *TimeBlockAverage) average() float64 {
ta.windowMtx.Lock()
var total = float64(0)
count := len(ta.values)
for i := 0; i < count; i++ {
total += ta.values[i]
}
ta.resetWindow()
return total / float64(count)
}
func (ta *TimeBlockAverage) startWindow() bool {
ta.startMtx.RLock()
if ta.windowActive {
ta.startMtx.RUnlock()
return false
}
ta.startMtx.RUnlock()
ta.startMtx.Lock()
defer ta.startMtx.Unlock()
if !ta.windowActive {
ta.windowActive = true
return true
}
return false
}
func (ta *TimeBlockAverage) resetWindow() {
ta.values = nil
ta.windowMtx.Unlock()
ta.startMtx.Lock()
ta.windowActive = false
ta.startMtx.Unlock()
}
func NewTimeBlockAverage(windowSize int) Aggregator {
return &TimeBlockAverage{
windowSize: time.Duration(windowSize),
windowMtx: &sync.Mutex{},
startMtx: &sync.RWMutex{},
}
}