private T InnerExecute <T>(Func <T> primaryFunction, Func <IEnumerable <Exception>, T> fallbackFunction, CancellationTokenSource cancellationTokenSource)
{
if (!ConfigurationService.GetHystrixCommandEnabled())
{
return(primaryFunction.Invoke());
}
var innerExceptions = new List <Exception>();
Stopwatch userThreadStopWatch = Stopwatch.StartNew();
if (CircuitBreaker.AllowRequest())
{
CommandMetrics.IncrementConcurrentExecutionCount();
ThreadPoolMetrics.MarkThreadExecution();
Stopwatch commandStopWatch = Stopwatch.StartNew();
try
{
var result = timeoutWrapper.Execute(primaryFunction, cancellationTokenSource);
commandStopWatch.Stop();
CircuitBreaker.CloseCircuit();
CommandMetrics.MarkSuccess();
return(result);
}
catch (HystrixTimeoutException hte)
{
commandStopWatch.Stop();
CommandMetrics.MarkTimeout();
innerExceptions.Add(hte);
}
catch (Exception ex)
{
commandStopWatch.Stop();
CommandMetrics.MarkFailure();
CommandMetrics.MarkExceptionThrown();
innerExceptions.Add(ex);
}
finally
{
// track command execution time
commandStopWatch.Stop();
CommandMetrics.AddCommandExecutionTime(commandStopWatch.Elapsed.TotalMilliseconds);
CommandMetrics.DecrementConcurrentExecutionCount();
ThreadPoolMetrics.MarkThreadCompletion();
// track execution time including threading overhead
userThreadStopWatch.Stop();
CommandMetrics.AddUserThreadExecutionTime(userThreadStopWatch.Elapsed.TotalMilliseconds);
}
}
else
{
CommandMetrics.MarkShortCircuited();
// track execution time including threading overhead
userThreadStopWatch.Stop();
CommandMetrics.AddUserThreadExecutionTime(userThreadStopWatch.Elapsed.TotalMilliseconds);
}
T fallbackResult = fallbackFunction.Invoke(innerExceptions);
CommandMetrics.MarkFallbackSuccess();
return(fallbackResult);
}