At the early days of IT...

...there was an order

And we've turn it to this

Not if but when...

🦜

🏴‍☠️

Polly

Simmy

Polly

polly, polly, polly, ...

Two options

• reactive
• proactive

reactive

• retry
• circuit breaker
• fallback
• hedging

proactive

• timeout
• rate limiter

Simmy

arrrrrrrrrrrrrrr

Chaos

• Exception
• Result
• Latency
• Behavior

is it complex?

var retryStrategyOptions = new RetryStrategyOptions
{
    ShouldHandle = (_) =>                    ValueTask.FromResult<bool>(true),
};

var pipeline = new ResiliencePipelineBuilder()
    .AddRetry(retryStrategyOptions)
    .Build();

is it complex?

bool success = false;

pipeline.Execute(async () =>
{
    WriteLine($"Fetching {DateTime.Now}");
    var c = new HttpClient();
    var r = await c.GetAsync("http://ooops.pl");
    success = r.IsSuccessStatusCode;
});

is it complex?

Hello, World!
Trying to fetch data from network 26.04.2024 00:19:13
Trying to fetch data from network 26.04.2024 00:19:15
Trying to fetch data from network 26.04.2024 00:19:17
Trying to fetch data from network 26.04.2024 00:19:19
Success: False

is it complex?

is it complex?

var o = new RetryStrategyOptions
{
    ShouldHandle = (_) => ValueTask.FromResult<bool>(true),
};

is it complex?

var pipeline = new ResiliencePipelineBuilder()
 .AddCircuitBreaker(o)
    .Build();

is it complex?

while (true)
pipeline.Execute(async () =>
{
    Console.WriteLine($"Fetching {DateTime.Now}");
    var c = new HttpClient();
    var r = await c.GetAsync("http://ooops");
    success = response.IsSuccessStatusCode;
});

is it complex?

Trying to fetch data from network 26.04.2024 00:16:37
... 100 times later
Trying to fetch data from network 26.04.2024 00:16:37

Unhandled exception. Polly.CircuitBreaker.BrokenCircuitException: The circuit is now open and is not allowing calls.
   at Polly.Outcome`1.GetResultOrRethrow()
   at Polly.ResiliencePipeline.Execute[TResult](Func`1 callback)
   at Program.<Main>$(String[] args) in Program.cs:line 25