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How a top-ranked engineering school reimagined CS curriculum (Ep. The syntax for handling results is .HandleResult(Func) rather than (what you have tried) .Handle(Func). You signed in with another tab or window. Step 3 of the readme shows syntax examples putting it all together; the second example there executes through a policy which has just been configured to log in the onRetry. Why in the Sierpiski Triangle is this set being used as the example for the OSC and not a more "natural"? https://github.com/App-vNext/Polly-Samples/blob/master/PollyDemos/Async/AsyncDemo02_WaitAndRetryNTimes.cs shows that you can use the onRetry: option, at least for WaitAndRetryAsync. Why did US v. Assange skip the court of appeal? Configure a client with Polly's Retry policy, in app startup. privacy statement. Seems a bit clearer (to me) than the fluent style I was originally thinking for chaining policies and that you captured at the end there. The approach your question outlines with TimeoutPolicy would only capture exceptions thrown by delegates the caller had earlier walked away from due to timeout, and only in TimeoutMode.Pessimistic; not all exceptions. As mentioned above I was working under the assumption that the RetryPolicy would keep the last non exception result under the FinalHandledResult property so I could return that instead of a default value. https://learn.microsoft.com/azure/architecture/patterns/retry, Polly and IHttpClientFactory If the final retry attempt fails then an exception will be thrown, so you may still want the try catch around ExecuteAsync to handle this scenario. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. For example, ICircuitBreakerPolicy defines. In this case, the policy is configured to try six times with an exponential retry, starting at two seconds. I just came across the Polly library whilst listening to Carl Franklins Better know a framework on .NET Rocks and it looks to be a perfect fit for use on a project Im working on which makes calls to various services and thus can encounter various types of exceptions, some which might succeed if retried after a certain amount of time (for example). In your production code, declare and consume policies by the execution interface type. To avoid the untidiness of repurposing FallbackPolicy, you could also code your own LogThenRethrowPolicy, within Polly's structures. Execution interfaces ISyncPolicy, IAsyncPolicy, ISyncPolicy and IAsyncPolicy define the execution overloads available to policies targeting sync/async, and non-generic / generic calls respectively. How do I remove all non alphanumeric characters from a string except dash? In the above we list the three exception types we want to retry the execution method on receiving. "One fault shouldn't sink the whole ship".