public void CommandMetrics_GetErrorPercentage()
{
HystrixCommandPropertiesSetter properties = UnitTestSetterFactory.GetCommandPropertiesSetter();
HystrixCommandMetrics metrics = GetMetrics(properties);
metrics.MarkSuccess(100);
Assert.AreEqual(0, metrics.GetHealthCounts().ErrorPercentage);
metrics.MarkFailure(1000);
Assert.AreEqual(50, metrics.GetHealthCounts().ErrorPercentage);
metrics.MarkSuccess(100);
metrics.MarkSuccess(100);
Assert.AreEqual(25, metrics.GetHealthCounts().ErrorPercentage);
metrics.MarkTimeout(5000);
metrics.MarkTimeout(5000);
Assert.AreEqual(50, metrics.GetHealthCounts().ErrorPercentage);
metrics.MarkSuccess(100);
metrics.MarkSuccess(100);
metrics.MarkSuccess(100);
// latent
metrics.MarkSuccess(5000);
// 6 success + 1 latent success + 1 failure + 2 timeout = 10 total
// latent success not considered error
// error percentage = 1 failure + 2 timeout / 10
Assert.AreEqual(30, metrics.GetHealthCounts().ErrorPercentage);
}
public void CircuitBreaker_TripCircuitOnTimeoutsAboveThreshold()
{
try
{
HystrixCommandPropertiesSetter properties = UnitTestSetterFactory.GetCommandPropertiesSetter();
HystrixCommandMetrics metrics = GetMetrics(properties);
IHystrixCircuitBreaker cb = GetCircuitBreaker(key, CommandGroupForUnitTest.OwnerTwo, metrics, properties);
// this should start as allowing requests
Assert.IsTrue(cb.AllowRequest());
Assert.IsFalse(cb.IsOpen());
// success with high latency
metrics.MarkSuccess(400);
metrics.MarkSuccess(400);
metrics.MarkTimeout(10);
metrics.MarkSuccess(400);
metrics.MarkTimeout(10);
metrics.MarkTimeout(10);
metrics.MarkSuccess(400);
metrics.MarkTimeout(10);
metrics.MarkTimeout(10);
// this should trip the circuit as the error percentage is above the threshold
Assert.IsFalse(cb.AllowRequest());
Assert.IsTrue(cb.IsOpen());
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
Assert.Fail("Error occurred: " + e.Message);
}
}
public void CircuitBreaker_TripCircuitOnTimeouts()
{
try
{
HystrixCommandPropertiesSetter properties = UnitTestSetterFactory.GetCommandPropertiesSetter();
HystrixCommandMetrics metrics = GetMetrics(properties);
IHystrixCircuitBreaker cb = GetCircuitBreaker(key, CommandGroupForUnitTest.OwnerTwo, metrics, properties);
// this should start as allowing requests
Assert.IsTrue(cb.AllowRequest());
Assert.IsFalse(cb.IsOpen());
// timeouts
metrics.MarkTimeout(2000);
metrics.MarkTimeout(2000);
metrics.MarkTimeout(2000);
metrics.MarkTimeout(2000);
// everything has been a timeout so we should not allow any requests
Assert.IsFalse(cb.AllowRequest());
Assert.IsTrue(cb.IsOpen());
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
Assert.Fail("Error occurred: " + e.Message);
}
}
public void CircuitBreaker_CircuitClosedAfterSuccess()
{
try
{
int sleepWindow = 200;
HystrixCommandPropertiesSetter properties = UnitTestSetterFactory.GetCommandPropertiesSetter().WithCircuitBreakerSleepWindowInMilliseconds(sleepWindow);
HystrixCommandMetrics metrics = GetMetrics(properties);
IHystrixCircuitBreaker cb = GetCircuitBreaker(key, CommandGroupForUnitTest.OwnerTwo, metrics, properties);
// fail
metrics.MarkFailure(1000);
metrics.MarkFailure(1000);
metrics.MarkFailure(1000);
metrics.MarkTimeout(1000);
// everything has failed in the test window so we should return false now
Assert.IsFalse(cb.AllowRequest());
Assert.IsTrue(cb.IsOpen());
// wait for sleepWindow to pass
Thread.Sleep(sleepWindow + 50);
// we should now allow 1 request
Assert.IsTrue(cb.AllowRequest());
// but the circuit should still be open
Assert.IsTrue(cb.IsOpen());
// and further requests are still blocked
Assert.IsFalse(cb.AllowRequest());
// the 'singleTest' succeeds so should cause the circuit to be closed
metrics.MarkSuccess(500);
cb.MarkSuccess();
// all requests should be open again
Assert.IsTrue(cb.AllowRequest());
Assert.IsTrue(cb.AllowRequest());
Assert.IsTrue(cb.AllowRequest());
// and the circuit should be closed again
Assert.IsFalse(cb.IsOpen());
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
Assert.Fail("Error occurred: " + e.Message);
}
}