private static async Task <TimeMeasureProfiler <TResult> > WithFunctionAsyncCore <TTuple, TResult>(TaskFuncFactory <TTuple, TResult> factory, Action <TimeMeasureOptions> setup) where TTuple : Template
{
var options = setup.ConfigureOptions();
var descriptor = options.MethodDescriptor?.Invoke() ?? new MethodDescriptor(factory.DelegateInfo);
var profiler = new TimeMeasureProfiler <TResult>()
{
Member = descriptor.ToString(),
Data = descriptor.MergeParameters(options.RuntimeParameters ?? factory.GenericArguments.ToArray())
};
await PerformTimeMeasuringAsync(profiler, options, async p => p.Result = await factory.ExecuteMethodAsync().ContinueWithSuppressedContext()).ContinueWithSuppressedContext();
return(profiler);
}
private static async Task <TResult> WithFuncAsyncCore <TTuple, TResult>(TaskFuncFactory <TTuple, TResult> factory, Action <TransientOperationOptions> setup) where TTuple : Template
{
var options = setup.ConfigureOptions();
if (!options.EnableRecovery)
{
return(await factory.ExecuteMethodAsync().ContinueWithSuppressedContext());
}
DateTime timestamp = DateTime.UtcNow;
TimeSpan latency = TimeSpan.Zero;
TimeSpan totalWaitTime = TimeSpan.Zero;
TimeSpan lastWaitTime = TimeSpan.Zero;
bool isTransientFault = false;
bool throwExceptions;
List <Exception> aggregatedExceptions = new List <Exception>();
TResult result = default(TResult);
for (int attempts = 0; ;)
{
bool exceptionThrown = false;
TimeSpan waitTime = options.RetryStrategy(attempts);
try
{
if (latency > options.MaximumAllowedLatency)
{
throw new LatencyException(string.Format(CultureInfo.InvariantCulture, "The latency of the operation exceeded the allowed maximum value of {0} seconds. Actual latency was: {1} seconds.", options.MaximumAllowedLatency.TotalSeconds, latency.TotalSeconds));
}
return(await factory.ExecuteMethodAsync().ContinueWithSuppressedContext());
}
catch (Exception ex)
{
try
{
lock (aggregatedExceptions) { aggregatedExceptions.Insert(0, ex); }
isTransientFault = options.DetectionStrategy(ex);
if (attempts >= options.RetryAttempts)
{
throw;
}
if (!isTransientFault)
{
throw;
}
lastWaitTime = waitTime;
totalWaitTime = totalWaitTime.Add(waitTime);
attempts++;
await Task.Delay(waitTime).ContinueWithSuppressedContext();
latency = DateTime.UtcNow.Subtract(timestamp).Subtract(totalWaitTime);
}
catch (Exception)
{
throwExceptions = true;
exceptionThrown = true;
if (isTransientFault)
{
var evidence = new TransientFaultEvidence(attempts, lastWaitTime, totalWaitTime, latency, new MethodDescriptor(factory.DelegateInfo).ToString());
aggregatedExceptions.InsertTransientFaultException(evidence);
FaultCallback?.Invoke(evidence);
}
break;
}
}
finally
{
if (exceptionThrown)
{
IDisposable disposable = result as IDisposable;
disposable?.Dispose();
}
}
}
if (throwExceptions)
{
throw new AggregateException(aggregatedExceptions);
}
return(result);
}
