For more detail see: NoOp documentation on wiki. Disregarding any other issues (conceptual or otherwise), You have the wrong generic parameter HttpWebResponse, it should be HttpResponseMessage as that is what SendAsync returns, Also, seemingly you would want to apply the policy to the SendAsync method, not the local method that returns a Task. I'm confused about the last part though. Then, we need to loop and execute the method until the triesvariable value is lower or equal to the numberOfRetriesvariable value. Different faults require different strategies; resilience means using a combination. Polly Policy.Handle(condition) Issue #274 App-vNext/Polly I have also tried a workaround using HandleResult() as follows: This works, however, the Policy makes it cumbersome to integrate with the rest of the code which uses just Policy. Making statements based on opinion; back them up with references or personal experience. You can rate examples to help us improve the quality of examples. to your account. Looking for job perks? Connect and share knowledge within a single location that is structured and easy to search. Polly v5.2.0 adds interfaces intended to support PolicyRegistry and to group Policy functionality by the interface segregation principle. a) an "OrderAck" object if everything went well. How to register polly in startup file in .net core 2.2? Why does contour plot not show point(s) where function has a discontinuity? How a top-ranked engineering school reimagined CS curriculum (Ep. Sorry for delay, i didn't noticed your message. Already on GitHub? The approach your question outlines with .Retry(0, ) would not work. GitHub App-vNext / Polly Public the current policy you have; the method (at least full signature) you are currently executing through that policy (is this effectively some Func<HttpResponseMessage> ?) In the above example we create a policy object using the PolicyBuilder (fluent) syntax. I am using HttpClient with Polly's CircuitBreaker to handle Exceptions and non-success status codes. Does the 500-table limit still apply to the latest version of Cassandra? You can implement those capabilities by applying Polly policies such as Retry, Circuit Breaker, Bulkhead Isolation, Timeout, and Fallback. Looking for job perks? Polly targets .NET Standard 1.1 (coverage: .NET Core 1.0, Mono, Xamarin, UWP, WP8.1+) and .NET Standard 2.0+ (coverage: .NET Core 2.0+, .NET Core 3.0, and later Mono, Xamarin and UWP targets). I creating a list of Tasks and executing them with Task.WhenAll(). Polly retry not always catching HttpRequestException, Cannot get Polly retry Http calls when given exceptions are raised, Embedded hyperlinks in a thesis or research paper. 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. Define a policy handling both exceptions and results something like this: Here are links to three blogs which provide fully worked examples: @reisenberger Thank you for answer, i just misunderstand docs. Polly is a .NET library that provides resilience and transient-fault handling capabilities. Rate-limit policies throw RateLimitRejectedException if too many requests are executed within the configured timespan. Then, only one or the other policy (not both) will handle any return result: To explain why your posted code generated 9 retries: both the predicates job => job.StartsWith("error") and job => job == "error" match "error". Polly is a .NET resilience and transient-fault-handling library that allows developers to express policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, Rate-limiting and Fallback in a fluent and thread-safe manner. A regular Retry policy can affect your system in cases of high concurrency and scalability and under high contention. Head over to the Simmy repo to find out more. The policy itself does not matter, as long as it throws an exception on any invocation of Execute(). 404) as failure, even though it should. 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. I consider to use Polly to create policy to log exception and rethrow. Polly policy to log exception and rethrow, https://github.com/App-vNext/Polly-Samples/blob/master/PollyDemos/Async/AsyncDemo02_WaitAndRetryNTimes.cs. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, There's lots of ways to write this. The function return can return two types of answers. Because of this limited applicability, I doubt we will invest time taking Polly in that direction. Perhjaps consider wrapping a CircuitBreaker (perhaps breaking specifically on TimeoutException) in with your Retry. I made an attempted repro from your code, and I can't reproduce the problem. For CircuitBreakerPolicy policies: For more detail see: Keys and Context Data on wiki. @reisenberger Hi! Both templates contain a full project structure referencing Polly, Polly's default build targets, and a build to build and test your contrib and make a NuGet package. I'm getting and error on this line: ExecuteAsync(() => func())); Cannot implicitly convert type 'System.Threading.Tasks.Task' to'System.Threading.Tasks.Task'. To date, Polly has been downloaded over 265 million times, and it's easy to see why.
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