Retry policies in C#

Transient failure, meet declarative persistence.

using Polly;
using Polly.Retry;

var pipeline = new ResiliencePipelineBuilder()
    .AddRetry(new RetryStrategyOptions
    {
        MaxRetryAttempts = 3,
        Delay = TimeSpan.FromMilliseconds(50),
        BackoffType = DelayBackoffType.Exponential,
    })
    .Build();

var attempts = 0;
pipeline.Execute(() =>
{
    attempts++;
    if (attempts < 3) throw new TimeoutException("flaky");
});
Console.WriteLine($"succeeded on attempt {attempts}");

How it works

1. A ResiliencePipeline is built once and reused.
2. MaxRetryAttempts, Delay and exponential backoff are options.
3. The flaky callback succeeds on attempt three, inside the budget.

Keywords and builtins used here

• if
• new
• throw
• using
• var

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85 tpm

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Step 1 of 2 in Resilience with Polly, step 8 of 16 in The open ecosystem.

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