或者:如何从静态方法记录。
从https://github.com/App-vNext/Polly你可以看到像这样的例子,其中记录器神奇地可用:
Policy
.Timeout(30, onTimeout: (context, timespan, task) =>
{
logger.Warn($"{context.PolicyKey} at {context.ExecutionKey}: execution timed out after {timespan.TotalSeconds} seconds.");
});
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在我的代码中,我使用IHttpClientFactorydotnet core 2.1 中的新模式,并将其添加到我的 Startup.csConfigureServices方法中:
services.AddHttpClient<IMySuperHttpClient, MySuperHttpClient>()
.AddPolicyHandler(MySuperHttpClient.GetRetryPolicy())
.AddPolicyHandler(MySuperHttpClient.GetCircuitBreakerPolicy());
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静态且GetRetryPolicy看起来像这样:
internal static IAsyncPolicy<HttpResponseMessage> GetRetryPolicy()
{
return HttpPolicyExtensions
.HandleTransientHttpError()
.OrResult(msg => msg.StatusCode == System.Net.HttpStatusCode.NotFound)
.WaitAndRetryAsync(
retryCount: 4,
sleepDurationProvider: retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)),
onRetry: OnRetry);
}
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其中OnRetry方法也必须是静态的:
private static void OnRetry(DelegateResult<HttpResponseMessage> delegateResult, TimeSpan timespan, Context context)
{
// var logger = ?? …Run Code Online (Sandbox Code Playgroud)