seaweedfs/go/stats/duration_counter.go

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package stats
import (
"time"
)
type TimedValue struct {
t time.Time
val int64
}
func NewTimedValue(t time.Time, val int64) *TimedValue {
return &TimedValue{t: t, val: val}
}
type RoundRobinCounter struct {
LastIndex int
Values []int64
Counts []int64
}
func NewRoundRobinCounter(slots int) *RoundRobinCounter {
return &RoundRobinCounter{LastIndex: -1, Values: make([]int64, slots), Counts: make([]int64, slots)}
}
func (rrc *RoundRobinCounter) Add(index int, val int64) {
for rrc.LastIndex != index {
rrc.LastIndex++
if rrc.LastIndex >= len(rrc.Values) {
if index >= len(rrc.Values) {
break //just avoid endless loop
}
rrc.LastIndex = 0
}
rrc.Values[rrc.LastIndex] = 0
rrc.Counts[rrc.LastIndex] = 0
}
rrc.Values[index] += val
rrc.Counts[index]++
}
func (rrc *RoundRobinCounter) Max() (max int64) {
for _, val := range rrc.Values {
if max < val {
max = val
}
}
return
}
func (rrc *RoundRobinCounter) Count() (cnt int64) {
for _, c := range rrc.Counts {
cnt += c
}
return
}
func (rrc *RoundRobinCounter) Sum() (sum int64) {
for _, val := range rrc.Values {
sum += val
}
return
}
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func (rrc *RoundRobinCounter) ToList() (ret []int64) {
index := rrc.LastIndex
step := len(rrc.Values)
for step > 0 {
step--
index++
if index >= len(rrc.Values) {
index = 0
}
ret = append(ret, rrc.Values[index])
}
return
}
type DurationCounter struct {
MinuteCounter *RoundRobinCounter
HourCounter *RoundRobinCounter
DayCounter *RoundRobinCounter
WeekCounter *RoundRobinCounter
}
func NewDurationCounter() *DurationCounter {
return &DurationCounter{
MinuteCounter: NewRoundRobinCounter(60),
HourCounter: NewRoundRobinCounter(60),
DayCounter: NewRoundRobinCounter(24),
WeekCounter: NewRoundRobinCounter(7),
}
}
// Add is for cumulative counts
func (sc *DurationCounter) Add(tv *TimedValue) {
sc.MinuteCounter.Add(tv.t.Second(), tv.val)
sc.HourCounter.Add(tv.t.Minute(), tv.val)
sc.DayCounter.Add(tv.t.Hour(), tv.val)
sc.WeekCounter.Add(int(tv.t.Weekday()), tv.val)
}