public void DefaultSleepImplementationRunsForInterval_RetriesWithNoException()
{
var sleepTime = 0;
using (SpinLoop.ForTests(sleepMilliseconds => { sleepTime += sleepMilliseconds; }))
{
var retryLogic = new RetryLogic(1, 500);
try
{
retryLogic.Execute(
() => {},
ex => RetryOrRethrow.Retry,
() => false);
}
catch (Exception ex)
{
Assert.That(sleepTime, Is.EqualTo(500));
Assert.That(ex, Is.TypeOf<MaxRetriesExceededException>());
Assert.That(ex.InnerException, Is.Null);
}
}
}
public void DefaultSleepImplementationRunsForInterval_WithExceptions()
{
var sleepTime = 0;
var expectedInnerMessage = "foo";
using(SpinLoop.ForTests(sleepMilliseconds => { sleepTime += sleepMilliseconds; }))
{
var retryLogic = new RetryLogic(1, 500);
try
{
retryLogic.Execute(
() => { throw new Exception(expectedInnerMessage); },
ex => RetryOrRethrow.Retry);
}
catch (Exception ex)
{
Assert.That(sleepTime, Is.EqualTo(500));
Assert.That(ex, Is.TypeOf<MaxRetriesExceededException>());
Assert.That(ex.InnerException, Is.Not.Null);
Assert.That(ex.InnerException.Message, Is.EqualTo(expectedInnerMessage));
}
}
}
public bool DoesDeploymentExist(DeploymentSlotUri deploymentUri)
{
var outcome = AzureDeploymentCheckOutcome.None;
var retry = new RetryLogic(_maxRetries, _sleepIntervalMilliseconds);
retry.Execute(
() => outcome = _managementLowLevelApi.CheckDeploymentStatus(deploymentUri),
ex => RetryOrRethrow.Rethrow,
() => outcome != AzureDeploymentCheckOutcome.Failed);
switch (outcome)
{
case AzureDeploymentCheckOutcome.Running:
case AzureDeploymentCheckOutcome.Suspended:
return true;
case AzureDeploymentCheckOutcome.NotFound:
return false;
default:
FailFast.WithMessage("Unexpected AzureDeploymentCheckOutcome: " + outcome);
// ReSharper disable HeuristicUnreachableCode
return false;
// ReSharper restore HeuristicUnreachableCode
}
}
public void RethrowsIfRequested()
{
var sleepCount = 0;
using(SpinLoop.ForTests(sleepTime => sleepCount++))
{
var retryLogic = new RetryLogic(3, 500);
var callCount = 0;
Assert.That(
() => retryLogic.Execute(
() =>
{
callCount++;
throw new Exception("foo");
},
ex => RetryOrRethrow.Rethrow),
Throws.Exception.With.Message.EqualTo("foo"));
Assert.That(callCount, Is.EqualTo(1));
Assert.That(sleepCount, Is.EqualTo(0));
}
}
public void WhenSuccessfulOnFirstTry_ItDoesntCallExceptionFilter_AndDoesntSleep_AndCallsOperation()
{
var sleepCount = 0;
using(SpinLoop.ForTests(sleepTime => sleepCount++))
{
var retryLogic = new RetryLogic(1, 500);
var wasCalled = false;
retryLogic.Execute(
() => { wasCalled = true; },
ex =>
{
Assert.Fail("shouldn't get called");
return RetryOrRethrow.Rethrow;
});
Assert.That(wasCalled);
Assert.That(sleepCount, Is.EqualTo(0));
}
}
public void RetriesWhenRequestedOnException()
{
var sleepCount = 0;
using (SpinLoop.ForTests(sleepTime => sleepCount++))
{
var retryLogic = new RetryLogic(1, 500);
var callCount = 0;
retryLogic.Execute(
() =>
{
callCount++;
if (callCount == 1)
throw new InvalidOperationException("foo");
},
ex => RetryOrRethrow.Retry);
Assert.That(callCount, Is.EqualTo(2), "call count");
Assert.That(sleepCount, Is.EqualTo(1), "sleep count");
}
}
public void RetriesTheExpectedNumberOfTimes()
{
var sleepCount = 0;
using(SpinLoop.ForTests(sleepTime => sleepCount++))
{
var retryLogic = new RetryLogic(3, 500);
var callCount = 0;
Assert.That(() => retryLogic.Execute(
() =>
{
callCount++;
throw new Exception("foo");
},
ex => RetryOrRethrow.Retry),
Throws.Exception.TypeOf<MaxRetriesExceededException>().With.InnerException.Message.EqualTo("foo"));
Assert.That(callCount, Is.EqualTo(4), "call count");
Assert.That(sleepCount, Is.EqualTo(3), "sleep count");
}
}
public void RetriesIfSuccessTestReturnsFalse()
{
var sleepCount = 0;
using(SpinLoop.ForTests(sleepTime => sleepCount++))
{
var retryLogic = new RetryLogic(3, 500);
var callCount = 0;
retryLogic.Execute(
() => callCount++,
ex => RetryOrRethrow.Retry,
() => callCount != 1);
Assert.That(callCount, Is.EqualTo(2), "should have retried once (after the first call)");
}
}
public void RetriesDoesntSleepIfSucceedsOnFirstTry()
{
var sleepCount = 0;
using (SpinLoop.ForTests(sleepTime => sleepCount++))
{
var retryLogic = new RetryLogic(3, 500);
var callCount = 0;
retryLogic.Execute(
() => callCount++,
ex => RetryOrRethrow.Retry,
() => true);
Assert.That(callCount, Is.EqualTo(1), "should have retried once (after the first call)");
Assert.That(sleepCount, Is.EqualTo(0), "shouldn't sleep");
}
}
public void WaitForDeploymentStatus(DeploymentSlotUri deploymentUri, AzureDeploymentCheckOutcome status)
{
FailFast.Unless(
status != AzureDeploymentCheckOutcome.Failed,
"can't wait on Failed!");
var outcome = AzureDeploymentCheckOutcome.None;
var retry = new RetryLogic(_maxRetries, _sleepIntervalMilliseconds);
retry.Execute(
() => outcome = _managementLowLevelApi.CheckDeploymentStatus(deploymentUri),
ex => RetryOrRethrow.Rethrow,
() => outcome == status);
}
private void ExecuteAsynchronousAction(Func<RequestUri> action)
{
var status = AzureRequestStatus.InProgress;
var retry = new RetryLogic(_maxRetries, _sleepIntervalMilliseconds);
retry.Execute(
() =>
{
RequestUri requestUri = null;
retry.Execute(
() => requestUri = action(),
ex => ex is UnhandledHttpException ? RetryOrRethrow.Retry : RetryOrRethrow.Rethrow);
if (requestUri != null)
retry.Execute(
() => status = _managementLowLevelApi.CheckRequestStatus(requestUri),
ex => ex is UnhandledHttpException ? RetryOrRethrow.Retry : RetryOrRethrow.Rethrow,
() => status != AzureRequestStatus.InProgress);
},
ex => RetryOrRethrow.Rethrow,
() => status == AzureRequestStatus.Succeeded);
}