public void CircuitBreaker_CircuitClosedAfterSuccessAndClearsStatisticalWindow()
{
try
{
int statisticalWindow = 200;
int sleepWindow = 10; // this is set very low so that returning from a retry still ends up having data in the buckets for the statisticalWindow
HystrixCommandPropertiesSetter properties = UnitTestSetterFactory.GetCommandPropertiesSetter().WithCircuitBreakerSleepWindowInMilliseconds(sleepWindow).WithMetricsRollingStatisticalWindowInMilliseconds(statisticalWindow);
HystrixCommandMetrics metrics = GetMetrics(properties);
IHystrixCircuitBreaker cb = GetCircuitBreaker(key, CommandGroupForUnitTest.OwnerTwo, metrics, properties);
// fail
metrics.MarkFailure(1000);
metrics.MarkFailure(1000);
metrics.MarkFailure(1000);
metrics.MarkFailure(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);
}
}
public void CircuitBreaker_MultipleTimeWindowRetriesBeforeClosingCircuit()
{
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.MarkFailure(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' fails so it should go back to sleep and not allow any requests again until another 'singleTest' after the sleep
metrics.MarkFailure(1000);
Assert.IsFalse(cb.AllowRequest());
Assert.IsFalse(cb.AllowRequest());
Assert.IsFalse(cb.AllowRequest());
// 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' fails again so it should go back to sleep and not allow any requests again until another 'singleTest' after the sleep
metrics.MarkFailure(1000);
Assert.IsFalse(cb.AllowRequest());
Assert.IsFalse(cb.AllowRequest());
Assert.IsFalse(cb.AllowRequest());
// 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());
// now it finally succeeds
metrics.MarkSuccess(200);
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);
}
}