// @nuget: Polly.Contrib.WaitAndRetry -Version 1.1.1

using System;

using System.Collections.Generic;

using System.Linq;

// Polly.Contrib.WaitAndRetry, 1.1.1

using Polly.Contrib.WaitAndRetry;

​

// https://stackoverflow.com/q/75366134/195755

public class Program

{

    public static void Main()

    {

        var classUnderTest = new MeasureBackoff();

    }

}

class MeasureBackoff

{

    public MeasureBackoff()

    {

        MedianJitterBackoff(1, 4, true);

        MedianJitterBackoff(1, 4, false);

        MedianJitterBackoff(0.5, 5, true);

        MedianJitterBackoff(1, 5, true);

        MedianJitterBackoff(1, 5, false);

        MedianJitterBackoff(2, 6, false);

        OurOne();

        Console.WriteLine();

        Console.WriteLine("--- SUMMARY ---------------------");

        Console.WriteLine(_summary);

    }

​

    System.Text.StringBuilder _summary = new();

​

    public void MedianJitterBackoff(double medianWaitSec, int retryCount, bool firstFast)

    {

        string scenario = $"{medianWaitSec} sec, retryCount: {retryCount}, firstFast: {firstFast}";

        Console.WriteLine(scenario);

​

        double totalDelay = 0;

        int testIterationCount = 20; // iterations to average together

        for (int i = 0; i < testIterationCount; ++i)

        {

            var delays = Backoff.DecorrelatedJitterBackoffV2(

                medianFirstRetryDelay: TimeSpan.FromSeconds(medianWaitSec),

                retryCount: retryCount,

                fastFirst: firstFast);

​

            double retryDelay = 0;

            foreach (TimeSpan delay in delays)

            {

                retryDelay += delay.TotalSeconds;

                totalDelay += delay.TotalSeconds;

                Console.Write($"\t{delay}");

            }

            Console.WriteLine();

            Console.WriteLine($"\tsum: {retryDelay:0.00} sec");

        }

        double median = totalDelay / testIterationCount;

        _summary.AppendLine($"{scenario} median wait: {median:0.00}");

    }

​

    public void OurOne()

    {

        string scenario = $"our one";

        Console.WriteLine(scenario);

​

        double totalDelay = 0;

        int testIterationCount = 2; // iterations to average together (no point for ours, there's no jitter)

        for (int i = 0; i < testIterationCount; ++i)

        {

            var delays = Enumerable.Range(0, 5).Select(retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)));

​

            double retryDelay = 0;

            foreach (TimeSpan delay in delays)

            {

                retryDelay += delay.TotalSeconds;

                totalDelay += delay.TotalSeconds;

                Console.Write($"\t{delay}");

            }

            Console.WriteLine();

            Console.WriteLine($"\tsum: {retryDelay:0.00} sec");

        }

        double median = totalDelay / testIterationCount;

        _summary.AppendLine($"{scenario} median wait: {median:0.00}");

    }

}

​