func NewIntLinearCounter(
id string, value int64, minVal int64, maxVal int64,
cntRate float64, inactiveTTL int64) *IntLinearCounter {
pqm := IntLinearCounter{
Id: id,
Value: value,
MinValue: minVal,
MaxValue: maxVal,
CountRate: cntRate,
LastUpdateNanoTs: common.UnixNanoTs(),
InactiveTTL: inactiveTTL,
CounterType: CNT_INT_COUNTER,
}
return &pqm
}
func (c *IntLinearCounter) Update() {
curTs := common.UnixNanoTs()
tsDelta := float64(curTs-c.LastUpdateNanoTs) / 1000000000.0
// If clocks moved back, just do nothing. Lets just remember the last time stamp.
if tsDelta < 0 {
c.LastUpdateNanoTs = curTs
return
}
valDelta := c.CountRate * tsDelta
if valDelta >= 1 || valDelta <= -1 {
c.Value += int64(valDelta)
leftover := valDelta - math.Trunc(valDelta)
// Overflow will decrease a current TS to take into account overflow value.
c.LastUpdateNanoTs = curTs - int64(math.Abs(tsDelta*leftover))
}
c.correctLimits()
}