Polly内部任务超时

Question

我正在调用一个端点，如果它返回404或在其他异常情况下立即失败，我希望重试该端点。

对于较短的时间跨度工作得很好，但当我使用指数回退运行时，我看到"Scheduling attempt 10/11 in at date“，但没有后续调用。

我想在一个任务中运行它，因为我想让它从主线程中退出队列，并在后台处理它。这个问题可能与正在处理的任务有关吗？

var settingsPage = _contentQueries.GetComponent<SettingsPage>();
var retryCount = 11;
var token = _authorizationService.GetBearerToken();

Task.Factory.StartNew(currentContext => {
    HttpContext.Current = (HttpContext) currentContext;

    var captureResult = Policy.HandleResult<HttpResponse>(r => r.Status == (int)HttpStatusCode.NotFound).WaitAndRetry(retryCount, retryAttempt =>
    {
        var nextAttemptInSeconds = Math.Pow(3, retryAttempt);
        _logger.Log($"Scheduling retry attempt {retryAttempt}/{retryCount} at {DateTime.Now.AddSeconds(nextAttemptInSeconds)}", activity, Level.Debug);
        return TimeSpan.FromSeconds(nextAttemptInSeconds);
    }).ExecuteAndCapture(() =>
    {
        var result = MakeWebClientGetRequest();

        if (RemoteErrorOccurred(result))
        {
            throw new Exception(result.Response);
        }

        return result;
    });


    if (captureResult.Outcome == OutcomeType.Successful)
    {
        _logger.Log("Process successful", activity, Level.Debug);
    }
    else
    {
        if (captureResult.FinalException != null)
        {
            _logger.Log($"Failed to process: {captureResult.FinalException}", activity, Level.Debug);
        }
        else
        {
            _logger.Log($"Failed to process after {retryCount} attempts", activity, Level.Debug);
        }
    }

    _databaseFactory.Dispose();
}, HttpContext.Current);

private static bool RemoteErrorOccurred(HttpResponse result)
{
    return result.Exception != null && result.Status != (int) HttpStatusCode.NotFound;
}

Answer 1

我最终选择了Hangfire's BackgroundJob.Enqueue而不是Task.Factory.StartNew。应用程序池回收可以防止像我的问题中那样长时间运行的任务。