private Retry CreateNewRetry(RetryHistory history)
{
int expoBackoff = System.Convert.ToInt32(Math.Pow(2, history.Retries.Count)) * history.Configuration.BaseDelayMs;
int jitteredBackoff = history.Configuration.Jitter(history.Retries, expoBackoff, history.Random);
return(new Retry(expoBackoff, jitteredBackoff));
}
public async Task InvokeWithRetry(Func <Task> request, RetryHistory history)
{
try
{
await request();
}
catch (Exception e)
{
if (history.Configuration != null && _del(e))
{
await Backoff(history, e);
await InvokeWithRetry(request, history);
}
else
{
throw e;
}
}
}
public async Task <T> InvokeWithRetry <T>(Func <Task <T> > request, RetryHistory history)
{
try
{
return(await request());
}
catch (Exception e)
{
if (history.Configuration != null && _del(e))
{
await Backoff(history, e);
return(await InvokeWithRetry <T>(request, history));
}
else
{
throw e;
}
}
}
private Task Backoff(RetryHistory history, Exception e)
{
if (history.Retries.Count >= history.Configuration.MaxAttempts)
{
throw new TaskCanceledException("Exceeded max retry attempts.", e);
}
Retry newRetry = CreateNewRetry(history);
history.Retries.Add(newRetry);
history.Configuration.RetryListener?.Invoke(history.Retries.Count, newRetry);
if (history.UserCancelToken.HasValue)
{
return(Task.Delay(newRetry.JitterBackoff, history.UserCancelToken.Value));
}
else
{
return(Task.Delay(newRetry.JitterBackoff));
}
}