/// <inheritdoc/>
public HystrixHealthCounts GetHealthCounts()
{
// we put an interval between snapshots so high-volume commands don't
// spend too much unnecessary time calculating metrics in very small time periods
long lastTime = lastHealthCountsSnapshot;
long currentTime = dateTimeProvider.GetCurrentTimeInMilliseconds();
if (((currentTime - lastTime) >= configurationService.GetMetricsHealthSnapshotIntervalInMilliseconds() || healthCountsSnapshot == null) &&
Interlocked.CompareExchange(ref lastHealthCountsSnapshot, dateTimeProvider.GetCurrentTimeInMilliseconds(), lastTime) == lastTime)
{
// our thread won setting the snapshot time so we will proceed with generating a new snapshot
// losing threads will continue using the old snapshot
long success = counter.GetRollingSum(HystrixRollingNumberEvent.Success);
long failure = counter.GetRollingSum(HystrixRollingNumberEvent.Failure); // fallbacks occur on this
long timeout = counter.GetRollingSum(HystrixRollingNumberEvent.Timeout); // fallbacks occur on this
// not used in dotnet version
long threadPoolRejected = counter.GetRollingSum(HystrixRollingNumberEvent.ThreadPoolRejected);
long semaphoreRejected = counter.GetRollingSum(HystrixRollingNumberEvent.SemaphoreRejected);
long totalCount = failure + success + timeout + threadPoolRejected + semaphoreRejected;
long errorCount = failure + timeout + threadPoolRejected + semaphoreRejected;
int errorPercentage = 0;
if (totalCount > 0)
{
errorPercentage = (int)((double)errorCount / totalCount * 100);
}
healthCountsSnapshot = new HystrixHealthCounts(totalCount, errorCount, errorPercentage);
}
return(healthCountsSnapshot);
}
/// <inheritdoc/>
private bool IsOpen()
{
if (CircuitIsOpen)
{
return(true);
}
// we're closed, so let's see if errors have made us so we should trip the circuit open
HystrixHealthCounts healthCounts = commandMetrics.GetHealthCounts();
// check if we are past the CircuitBreakerRequestVolumeThreshold
if (healthCounts.GetTotalRequests() < configurationService.GetCircuitBreakerRequestVolumeThreshold())
{
// we are not past the minimum volume threshold for the statisticalWindow so we'll return false immediately and not calculate anything
return(false);
}
// if error percentage is below threshold the circuit remains closed
if (healthCounts.GetErrorPercentage() < configurationService.GetCircuitBreakerErrorThresholdPercentage())
{
return(false);
}
// failure rate is too high, trip the circuit (multiple threads can come to these lines, but do we care?)
OpenCircuit();
return(true);
}
public void ResetCounter()
{
counter.Reset();
lastHealthCountsSnapshot = dateTimeProvider.GetCurrentTimeInMilliseconds();
healthCountsSnapshot = new HystrixHealthCounts(0, 0, 0);
}
