public void CheckThatFilteredxceptionsAreIgnored()
{
const string message = "testMessage";
var exception = new Exception(message);
var circuit = new Circuit<string>(1);
circuit.ExceptionFilters.Add(e => e.Message == message);
var circuit1 = circuit;
Action execution = () => circuit1.Execute(() => { throw exception; });
execution.ShouldThrow<Exception>().Where(e => e == exception);
circuit.State.Position.Should().Be(CircuitPosition.Closed);
}
public void CheckThatExcludedExceptionsAreIgnored()
{
var exception = new NullReferenceException();
var circuit = new Circuit<string>(1)
{
ExcludedExceptions = new[] { typeof(NullReferenceException) }
};
var circuit1 = circuit;
Action execution = () => circuit1.Execute(() => { throw exception; });
execution.ShouldThrow<NullReferenceException>().Where(e => e == exception);
circuit.State.Position.Should().Be(CircuitPosition.Closed);
}
public void CheckThatTheCircuitFailsUntilTheCircuitIsHalfOpenAgainThenClosesAgainOnSuccess()
{
var timeSpan = TimeSpan.FromSeconds(1);
bool[] throwException = { true };
var failSafe = DateTime.UtcNow.Add(timeSpan.Add(timeSpan));
var exception = new Exception();
var circuit = new Circuit<string>(1, timeSpan);
Func<string> function = () =>
{
if (throwException[0])
{
throw exception;
}
return "success";
};
Action first = () => circuit.Execute(function);
first.ShouldThrow<Exception>().Where(e => e == exception);
circuit.State.Position.Should().Be(CircuitPosition.Open);
while (DateTime.UtcNow < circuit.State.ResetTime)
{
Action action = () => circuit.Execute(function);
action.ShouldThrow<CircuitOpenException>();
failSafe.Should().BeAfter(DateTime.UtcNow, "otherwise the test has timed out");
}
circuit.State.Position.Should().Be(CircuitPosition.HalfOpen);
throwException[0] = false;
circuit.Execute(function);
circuit.State.Position.Should().Be(CircuitPosition.Closed);
}
public void CircuitBreakerBreaksOnFailureAndSetsTheStateToOpenAfterTheThresholdIsReached()
{
var exception = new Exception();
var circuit = new Circuit<string>(2);
Action first = () => circuit.Execute(() => { throw exception; });
first.ShouldThrow<Exception>().Where(e => e == exception);
circuit.State.Position.Should().Be(CircuitPosition.Closed);
Action second = () => circuit.Execute(() => { throw exception; });
second.ShouldThrow<Exception>().Where(e => e == exception);
circuit.State.Position.Should().Be(CircuitPosition.Open);
}
public void CheckThatTheThresholdIsResetAfterASuccessfulOperation()
{
var timeSpan = TimeSpan.FromSeconds(1);
var failSafe = DateTime.UtcNow.Add(timeSpan.Add(timeSpan));
bool[] throwException = { true };
const int threshold = 2;
var exception = new Exception();
Func<string> function = () =>
{
if (throwException[0])
{
throw exception;
}
return "success";
};
var circuit = new Circuit<string>(threshold, timeSpan);
Action first = () => circuit.Execute(function);
Action second = () => circuit.Execute(function);
first.ShouldThrow<Exception>().Where(e => e == exception);
second.ShouldThrow<Exception>().Where(e => e == exception);
circuit.State.Position.Should().Be(CircuitPosition.Open);
circuit.State.CurrentIteration.Should().Be(threshold);
while (DateTime.UtcNow < circuit.State.ResetTime)
{
failSafe.Should().BeAfter(DateTime.UtcNow, "otherwise the test has timed out");
}
throwException[0] = false;
circuit.Execute(function);
circuit.State.Position.Should().Be(CircuitPosition.Closed);
circuit.State.CurrentIteration.Should().Be(0);
}
public void CheckThatTheCircuitIsSetToHalfOpenAfterATimeout()
{
var timeSpan = TimeSpan.FromSeconds(1);
var exception = new Exception();
var circuit = new Circuit<string>(1, timeSpan);
var failSafe = DateTime.UtcNow.Add(timeSpan.Add(timeSpan));
circuit.State.Position.Should().Be(CircuitPosition.Closed);
Action first = () => circuit.Execute(() => { throw exception; });
first.ShouldThrow<Exception>().Where(e => e == exception);
circuit.State.Position.Should().Be(CircuitPosition.Open);
while (DateTime.UtcNow < circuit.State.ResetTime)
{
failSafe.Should().BeAfter(DateTime.UtcNow, "otherwise the test has timed out");
}
circuit.State.Position.Should().Be(CircuitPosition.HalfOpen);
}
public void CheckThatTheCircuitFailsUntilTheCircuitIsHalfOpenAgainThenOpensAgainOnFailure()
{
var timeSpan = TimeSpan.FromSeconds(1);
var circuit = new Circuit<string>(1, timeSpan);
var failSafe = DateTime.UtcNow.Add(timeSpan.Add(timeSpan));
try
{
circuit.Execute(() => { throw new Exception(); });
}
catch
{
circuit.State.Position.Should().Be(CircuitPosition.Open);
}
while (DateTime.UtcNow < circuit.State.ResetTime)
{
Action action = () => circuit.Execute(() => { throw new Exception(); });
action.ShouldThrow<CircuitOpenException>();
failSafe.Should().BeAfter(DateTime.UtcNow, "otherwise the test has timed out");
}
circuit.State.Position.Should().Be(CircuitPosition.HalfOpen);
try
{
circuit.Execute(() => { throw new Exception(); });
}
catch
{
circuit.State.Position.Should().Be(CircuitPosition.Open);
}
}
