calculationstrategy

type CalculateFunc ¶

type CalculateFunc func(targetQPS, curQPS, prevProbability float64) (newProbability float64)

CalculateFunc wraps a function of appropriate signature and makes a ProbabilityCalculator from it.

func (c CalculateFunc) Calculate(targetQPS, curQPS, prevProbability float64) float64

type PercentageIncreaseCappedCalculator ¶

type PercentageIncreaseCappedCalculator struct {
	// contains filtered or unexported fields
}

PercentageIncreaseCappedCalculator is a probability calculator that caps the probability increase to a certain percentage of the previous probability.

Given prevProb = 0.1, newProb = 0.5, and cap = 0.5: (0.5 - 0.1)/0.1 = 400% increase. Given that our cap is 50%, the probability can only increase to 0.15.

Given prevProb = 0.4, newProb = 0.5, and cap = 0.5: (0.5 - 0.4)/0.4 = 25% increase. Given that this is below our cap of 50%, the probability can increase to 0.5.

func NewPercentageIncreaseCappedCalculator(percentageIncreaseCap float64) PercentageIncreaseCappedCalculator

func (c PercentageIncreaseCappedCalculator) Calculate(targetQPS, curQPS, prevProbability float64) float64

type ProbabilityCalculator ¶

type ProbabilityCalculator interface {
	Calculate(targetQPS, curQPS, prevProbability float64) (newProbability float64)
}

ProbabilityCalculator calculates the new probability given the current and target QPS