5

或者:如何从静态方法记录。

https://github.com/App-vNext/Polly你有这样的例子,其中一个记录器神奇地可用:

Policy
  .Timeout(30, onTimeout: (context, timespan, task) => 
    {
        logger.Warn($"{context.PolicyKey} at {context.ExecutionKey}: execution timed out after {timespan.TotalSeconds} seconds.");
    });

在我的代码中,我使用来自 dotnet core 2.1 的新 IHttpClientFactory 模式,并在我的 Startup.cs ConfigureServices 方法中添加它:

    services.AddHttpClient<IMySuperHttpClient, MySuperHttpClient>()
        .AddPolicyHandler(MySuperHttpClient.GetRetryPolicy())
        .AddPolicyHandler(MySuperHttpClient.GetCircuitBreakerPolicy());

GetRetryPolicy 是静态的并且看起来像这样:

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);
}

OnRetry 方法也必须是静态的:

private static void OnRetry(DelegateResult<HttpResponseMessage> delegateResult, TimeSpan timespan, Context context)
{
    // var logger = ??
    // logger.LogWarning($"API call failed blah blah.");
}

如果可能的话,如何在这里访问 ILoggerFactory?

4

0 回答 0