public void Should_report_cancellation_during_faulting_last_retry_execution_when_user_delegate_does_observe_cancellationtoken()
{
var policy = Policy
.Handle <DivideByZeroException>()
.Retry(3);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 3,
AttemptDuringWhichToCancel = 1 + 3,
ActionObservesCancellation = true
};
policy.Invoking(x => x.RaiseExceptionAndOrCancellation <DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow <OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(1 + 3);
}
public void Should_report_cancellation_during_otherwise_non_faulting_action_execution_when_user_delegate_observes_cancellationtoken()
{
var durationOfBreak = TimeSpan.FromMinutes(1);
CircuitBreakerPolicy breaker = Policy
.Handle <DivideByZeroException>()
.CircuitBreaker(2, durationOfBreak);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 0,
AttemptDuringWhichToCancel = 1,
ActionObservesCancellation = true
};
breaker.Invoking(x => x.RaiseExceptionAndOrCancellation <DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow <OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(1);
}
public void Should_report_cancellation_after_faulting_action_execution_and_cancel_further_retries_if_onRetry_invokes_cancellation()
{
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
var policy = Policy
.Handle <DivideByZeroException>()
.WaitAndRetry(new[] { 1.Seconds(), 2.Seconds(), 3.Seconds() },
(_, __) =>
{
cancellationTokenSource.Cancel();
});
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 3,
AttemptDuringWhichToCancel = null, // Cancellation during onRetry instead - see above.
ActionObservesCancellation = false
};
policy.Invoking(x => x.RaiseExceptionAndOrCancellation <DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow <OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(1);
}
public void Should_honour_and_report_cancellation_during_func_execution()
{
var policy = Policy
.Handle <DivideByZeroException>()
.WaitAndRetry(new[] { 1.Seconds(), 2.Seconds(), 3.Seconds() });
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
bool?result = null;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 0,
AttemptDuringWhichToCancel = 1,
ActionObservesCancellation = true
};
policy.Invoking(x => result = x.RaiseExceptionAndOrCancellation <DivideByZeroException, bool>(scenario, cancellationTokenSource, onExecute, true))
.ShouldThrow <OperationCanceledException>().And.CancellationToken.Should().Be(cancellationToken);
result.Should().Be(null);
attemptsInvoked.Should().Be(1);
}
public void Should_execute_func_returning_value_when_cancellationtoken_not_cancelled()
{
var policy = Policy
.Handle <DivideByZeroException>()
.WaitAndRetry(new[] { 1.Seconds(), 2.Seconds(), 3.Seconds() });
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
bool?result = null;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 0,
AttemptDuringWhichToCancel = null
};
policy.Invoking(x => result = x.RaiseExceptionAndOrCancellation <DivideByZeroException, bool>(scenario, cancellationTokenSource, onExecute, true))
.ShouldNotThrow();
result.Should().BeTrue();
attemptsInvoked.Should().Be(1);
}
public void Should_not_execute_action_when_cancellationtoken_cancelled_before_execute()
{
var policy = Policy
.Handle <DivideByZeroException>()
.WaitAndRetry(new[] { 1.Seconds(), 2.Seconds(), 3.Seconds() });
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 3,
AttemptDuringWhichToCancel = null, // Cancellation token cancelled manually below - before any scenario execution.
};
cancellationTokenSource.Cancel();
policy.Invoking(x => x.RaiseExceptionAndOrCancellation <DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow <OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(0);
}
public void Should_report_cancellation_during_faulting_retried_action_execution_and_cancel_further_retries_when_user_delegate_does_not_observe_cancellationtoken()
{
var policy = Policy
.Handle <DivideByZeroException>()
.WaitAndRetry(new[] { 1.Seconds(), 2.Seconds(), 3.Seconds() });
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 3,
AttemptDuringWhichToCancel = 2,
ActionObservesCancellation = false
};
policy.Invoking(x => x.RaiseExceptionAndOrCancellation <DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow <OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(2);
}
public void Should_execute_func_returning_value_when_cancellationtoken_not_cancelled()
{
var durationOfBreak = TimeSpan.FromMinutes(1);
CircuitBreakerPolicy breaker = Policy
.Handle <DivideByZeroException>()
.CircuitBreaker(2, durationOfBreak);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
bool?result = null;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 0,
AttemptDuringWhichToCancel = null,
};
breaker.Invoking(x => result = x.RaiseExceptionAndOrCancellation <DivideByZeroException, bool>(scenario, cancellationTokenSource, onExecute, true))
.ShouldNotThrow();
result.Should().BeTrue();
attemptsInvoked.Should().Be(1);
}
public void Should_not_execute_action_when_cancellationtoken_cancelled_before_execute()
{
var durationOfBreak = TimeSpan.FromMinutes(1);
CircuitBreakerPolicy breaker = Policy
.Handle <DivideByZeroException>()
.CircuitBreaker(2, durationOfBreak);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 0,
AttemptDuringWhichToCancel = null, // Cancellation token cancelled manually below - before any scenario execution.
};
cancellationTokenSource.Cancel();
breaker.Invoking(x => x.RaiseExceptionAndOrCancellation <DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow <OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(0);
}
public void Should_honour_and_report_cancellation_during_func_execution()
{
CircuitBreakerPolicy breaker = Policy
.Handle <DivideByZeroException>()
.CircuitBreaker(2, TimeSpan.FromMinutes(1));
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
bool?result = null;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 0,
AttemptDuringWhichToCancel = 1,
ActionObservesCancellation = true
};
breaker.Invoking(x => result = x.RaiseExceptionAndOrCancellation <DivideByZeroException, bool>(scenario, cancellationTokenSource, onExecute, true))
.ShouldThrow <OperationCanceledException>().And.CancellationToken.Should().Be(cancellationToken);
result.Should().Be(null);
attemptsInvoked.Should().Be(1);
}
public void Should_honour_cancellation_immediately_during_wait_phase_of_waitandretry()
{
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
SystemClock.Sleep = (timeSpan, ct) => Task.Delay(timeSpan, ct).Wait(ct);
TimeSpan shimTimeSpan = TimeSpan.FromSeconds(1); // Consider increasing shimTimeSpan if test fails transiently in different environments.
TimeSpan retryDelay = shimTimeSpan + shimTimeSpan + shimTimeSpan;
var policy = Policy
.Handle <DivideByZeroException>()
.WaitAndRetry(new[] { retryDelay });
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
Stopwatch watch = new Stopwatch();
watch.Start();
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 1,
AttemptDuringWhichToCancel = null, // Cancellation invoked after delay - see below.
ActionObservesCancellation = false
};
cancellationTokenSource.CancelAfter(shimTimeSpan);
policy.Invoking(x => x.RaiseExceptionAndOrCancellation <DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow <OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
watch.Stop();
attemptsInvoked.Should().Be(1);
watch.Elapsed.Should().BeLessThan(retryDelay);
watch.Elapsed.Should().BeCloseTo(shimTimeSpan, precision: (int)(shimTimeSpan.TotalMilliseconds) / 2); // Consider increasing shimTimeSpan, or loosening precision, if test fails transiently in different environments.
}
public void Should_execute_all_tries_when_faulting_and_cancellationtoken_not_cancelled()
{
var policy = Policy
.Handle <DivideByZeroException>()
.Retry(3);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 3,
AttemptDuringWhichToCancel = null,
};
policy.Invoking(x => x.RaiseExceptionAndOrCancellation <DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow <DivideByZeroException>();
attemptsInvoked.Should().Be(1 + 3);
}
public void Should_report_cancellation_when_both_open_circuit_and_cancellation()
{
CircuitBreakerPolicy breaker = Policy
.Handle <DivideByZeroException>()
.CircuitBreaker(1, TimeSpan.FromMinutes(1));
breaker.Invoking(x => x.RaiseException <DivideByZeroException>())
.ShouldThrow <DivideByZeroException>();
breaker.Invoking(x => x.RaiseException <DivideByZeroException>())
.ShouldThrow <BrokenCircuitException>()
.WithMessage("The circuit is now open and is not allowing calls.")
.WithInnerException <DivideByZeroException>();
// Circuit is now broken.
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
cancellationTokenSource.Cancel();
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1,
AttemptDuringWhichToCancel = null, // Cancelled manually instead - see above.
ActionObservesCancellation = false
};
breaker.Invoking(x => x.RaiseExceptionAndOrCancellation <DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow <OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(0);
}
public void Should_report_cancellation_when_both_open_circuit_and_cancellation()
{
CircuitBreakerPolicy breaker = Policy
.Handle<DivideByZeroException>()
.CircuitBreaker(1, TimeSpan.FromMinutes(1));
breaker.Invoking(x => x.RaiseException<DivideByZeroException>())
.ShouldThrow<DivideByZeroException>();
breaker.Invoking(x => x.RaiseException<DivideByZeroException>())
.ShouldThrow<BrokenCircuitException>()
.WithMessage("The circuit is now open and is not allowing calls.")
.WithInnerException<DivideByZeroException>();
// Circuit is now broken.
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
cancellationTokenSource.Cancel();
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1,
AttemptDuringWhichToCancel = null, // Cancelled manually instead - see above.
ActionObservesCancellation = false
};
breaker.Invoking(x => x.RaiseExceptionAndOrCancellation<DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow<OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(0);
}
public void Should_execute_all_tries_when_faulting_and_cancellationtoken_not_cancelled()
{
var policy = Policy
.Handle<DivideByZeroException>()
.Retry(3);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 3,
AttemptDuringWhichToCancel = null,
};
policy.Invoking(x => x.RaiseExceptionAndOrCancellation<DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow<DivideByZeroException>();
attemptsInvoked.Should().Be(1 + 3);
}
public void Should_not_execute_action_when_cancellationtoken_cancelled_before_execute()
{
var policy = Policy
.Handle<DivideByZeroException>()
.Retry(3);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 3,
AttemptDuringWhichToCancel = null, // Cancellation token cancelled manually below - before any scenario execution.
};
cancellationTokenSource.Cancel();
policy.Invoking(x => x.RaiseExceptionAndOrCancellation<DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow<OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(0);
}
public void Should_report_cancellation_during_faulting_retried_action_execution_and_cancel_further_retries_when_user_delegate_observes_cancellationtoken()
{
var policy = Policy
.Handle<DivideByZeroException>()
.Retry(3);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 3,
AttemptDuringWhichToCancel = 2,
ActionObservesCancellation = true
};
policy.Invoking(x => x.RaiseExceptionAndOrCancellation<DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow<OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(2);
}
public void Should_report_faulting_from_faulting_last_retry_execution_when_user_delegate_does_not_observe_cancellation_raised_during_last_retry()
{
var policy = Policy
.Handle<DivideByZeroException>()
.Retry(3);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 3,
AttemptDuringWhichToCancel = 1 + 3,
ActionObservesCancellation = false
};
policy.Invoking(x => x.RaiseExceptionAndOrCancellation<DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow<DivideByZeroException>();
attemptsInvoked.Should().Be(1 + 3);
}
public void Should_report_cancellation_after_faulting_action_execution_and_cancel_further_retries_if_onRetry_invokes_cancellation()
{
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
var policy = Policy
.Handle<DivideByZeroException>()
.Retry(3, (_, __) =>
{
cancellationTokenSource.Cancel();
});
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 3,
AttemptDuringWhichToCancel = null, // Cancellation during onRetry instead - see above.
ActionObservesCancellation = false
};
policy.Invoking(x => x.RaiseExceptionAndOrCancellation<DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow<OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(1);
}
public void Should_execute_func_returning_value_when_cancellationtoken_not_cancelled()
{
var policy = Policy
.Handle<DivideByZeroException>()
.Retry(3);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
bool? result = null;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 0,
AttemptDuringWhichToCancel = null,
};
policy.Invoking(x => result = x.RaiseExceptionAndOrCancellation<DivideByZeroException, bool>(scenario, cancellationTokenSource, onExecute, true))
.ShouldNotThrow();
result.Should().BeTrue();
attemptsInvoked.Should().Be(1);
}
public void Should_report_cancellation_during_faulting_action_execution_when_user_delegate_observes_cancellationtoken()
{
var durationOfBreak = TimeSpan.FromMinutes(1);
CircuitBreakerPolicy breaker = Policy
.Handle<DivideByZeroException>()
.CircuitBreaker(2, durationOfBreak);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1,
AttemptDuringWhichToCancel = 1,
ActionObservesCancellation = true
};
breaker.Invoking(x => x.RaiseExceptionAndOrCancellation<DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow<OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
attemptsInvoked.Should().Be(1);
}
public void Should_honour_and_report_cancellation_during_func_execution()
{
var policy = Policy
.Handle<DivideByZeroException>()
.Retry(3);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
bool? result = null;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 0,
AttemptDuringWhichToCancel = 1,
ActionObservesCancellation = true
};
policy.Invoking(x => result = x.RaiseExceptionAndOrCancellation<DivideByZeroException, bool>(scenario, cancellationTokenSource, onExecute, true))
.ShouldThrow<OperationCanceledException>().And.CancellationToken.Should().Be(cancellationToken);
result.Should().Be(null);
attemptsInvoked.Should().Be(1);
}
public void Should_honour_cancellation_immediately_during_wait_phase_of_waitandretry()
{
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
SystemClock.Sleep = (timeSpan, ct) => Task.Delay(timeSpan, ct).Wait(ct);
TimeSpan shimTimeSpan = TimeSpan.FromSeconds(1); // Consider increasing shimTimeSpan if test fails transiently in different environments.
TimeSpan retryDelay = shimTimeSpan + shimTimeSpan + shimTimeSpan;
var policy = Policy
.Handle<DivideByZeroException>()
.WaitAndRetry(new[] { retryDelay });
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
Stopwatch watch = new Stopwatch();
watch.Start();
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 1 + 1,
AttemptDuringWhichToCancel = null, // Cancellation invoked after delay - see below.
ActionObservesCancellation = false
};
cancellationTokenSource.CancelAfter(shimTimeSpan);
policy.Invoking(x => x.RaiseExceptionAndOrCancellation<DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldThrow<OperationCanceledException>()
.And.CancellationToken.Should().Be(cancellationToken);
watch.Stop();
attemptsInvoked.Should().Be(1);
watch.Elapsed.Should().BeLessThan(retryDelay);
watch.Elapsed.Should().BeCloseTo(shimTimeSpan, precision: (int)(shimTimeSpan.TotalMilliseconds) / 2); // Consider increasing shimTimeSpan, or loosening precision, if test fails transiently in different environments.
}
public void Should_execute_action_when_non_faulting_and_cancellationtoken_not_cancelled()
{
var durationOfBreak = TimeSpan.FromMinutes(1);
CircuitBreakerPolicy breaker = Policy
.Handle<DivideByZeroException>()
.CircuitBreaker(2, durationOfBreak);
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
CancellationToken cancellationToken = cancellationTokenSource.Token;
int attemptsInvoked = 0;
Action onExecute = () => attemptsInvoked++;
PolicyExtensions.ExceptionAndOrCancellationScenario scenario = new PolicyExtensions.ExceptionAndOrCancellationScenario
{
NumberOfTimesToRaiseException = 0,
AttemptDuringWhichToCancel = null,
};
breaker.Invoking(x => x.RaiseExceptionAndOrCancellation<DivideByZeroException>(scenario, cancellationTokenSource, onExecute))
.ShouldNotThrow();
attemptsInvoked.Should().Be(1);
}
