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Reusable Abstractions

FedEx Shipping

Stamps Shipping

USPS Shipping

Poly policy Sample

varrequest=newValidateAddress(model?.RequestId??Guid.NewGuid().ToString(),originalAddress,originalAddress);varresponse=await_policy.ExecuteAsync(async(ctx,ct)=>await_validationProvider.ValidateAddressAsync(request,ct),newContext{[_policyContextMethod]="ValidateAsync"},cancellationToken);privateIAsyncPolicyGetRetryWithTimeOutPolicy(){// each call is limited to 30 seconds in case when fedex is non-reponsive and it is 1min timeout, it is way to long// The request channel timed out attempting to send after 00:01:00.// Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time allotted to this operation may have been a portion of a longer timeout.vartimeoutPolicy=Policy.TimeoutAsync(30,TimeoutStrategy.Pessimistic);varjitterer=newRandom();returnPolicy.Handle<TimeoutRejectedException>().WaitAndRetryAsync(retryCount:3,// exponential back-off plus some jittersleepDurationProvider:(retryAttempt,context)=>{returnTimeSpan.FromSeconds(Math.Pow(2,retryAttempt))+TimeSpan.FromMilliseconds(jitterer.Next(0,200));},onRetry:(ex,span,context)=>{varmethodName=context[_policyContextMethod]??"MethodNotSpecified";_logger.LogWarning("{Method} wait {Seconds} to execute with exception: {Message} for named policy: {Policy}",methodName,span.TotalSeconds,ex.Message,context.PolicyKey);}).WithPolicyKey($"{nameof(FedExAddressValidationProvider)}WaitAndRetryAsync").WrapAsync(timeoutPolicy);}

References