using System;

using Polly;

using Polly.CircuitBreaker;

​

public class Program

{

    const int numberOfTimesToRetry = 20;

    const int numberOfFailures = 5;

    static int tries = 0;

    public static void Main()

    {

        var circuitBreaker = Policy

            .Handle<InvalidOperationException>()

            .CircuitBreaker(

                exceptionsAllowedBeforeBreaking: 3,

                durationOfBreak: TimeSpan.FromMilliseconds(100),

                onBreak: (e, span) => Console.WriteLine("Breaking circuit for " + span.TotalMilliseconds + "ms due to " + e.Message ),

                onReset: () => Console.WriteLine("Trial call succeeded: circuit closing again."),

                onHalfOpen: () => Console.WriteLine("Circuit break time elapsed.  Circuit now half open: permitting a trial call.")

        );

        var retryPolicy = Policy

            .Handle<InvalidOperationException>()

            .Or<BrokenCircuitException>()

            .WaitAndRetry(

                retryCount: numberOfTimesToRetry, 

                sleepDurationProvider: i => TimeSpan.FromMilliseconds(20), // The short timespans used here are because of timing limits imposed by .NETFiddle: https://dotnetfiddle.uservoice.com/knowledgebase/articles/282670-restrictions.  Real-world network examples would back off over seconds.

                onRetry: (e, span, i, ctx) => Console.WriteLine((e is BrokenCircuitException ? "Failed fast" : "Retrying") + " due to " + e.Message + " Waiting " + span.TotalMilliseconds + "ms first. Try " + i + " next.")

        );

        string result = retryPolicy.Wrap(circuitBreaker).Execute(() => GetJson());

        Console.WriteLine("Got result: " + result);

    }

​

    public static string GetJson()

    {

        if (tries++ <= numberOfFailures)

        {

            throw new InvalidOperationException("Something went wrong.");

        }

​

        return "SomeProperty: \"some interesting value\"";

    }

}

​

​