public async Task ShouldDelayOnChaos()
{
ChaosScenario noChaos = new ChaosScenario("No Chaos", failureRate: 0.0);
ChaosScenario delayChaos = new ChaosScenario("Full Chaos", delay: 10);
var sw = Stopwatch.StartNew();
// Expect no delays from Chaos that is not configured
sw.Restart();
ChaosMonkey.Chaos(noChaos);
Assert.Less(sw.ElapsedMilliseconds, 10, "No chaos resulted in an unexpected delay.");
sw.Restart();
await ChaosMonkey.ChaosAsync(noChaos);
Assert.Less(sw.ElapsedMilliseconds, 10, "No chaos resulted in an unexpected delay.");
// Expect delays from Chaos that is configured
sw.Restart();
ChaosMonkey.Chaos(delayChaos);
Assert.GreaterOrEqual(sw.ElapsedMilliseconds, 10, "No chaos resulted in an unexpected delay.");
sw.Restart();
await ChaosMonkey.ChaosAsync(delayChaos);
Assert.GreaterOrEqual(sw.ElapsedMilliseconds, 10, "No chaos resulted in an unexpected delay.");
}
public async Task ShouldThrowOnExpectedChaos()
{
ChaosScenario noChaos = new ChaosScenario("No Chaos", failureRate: 0.0);
ChaosScenario fullChaos = new ChaosScenario("Full Chaos", failureRate: 1.0);
// No exception is expected
ChaosMonkey.Chaos(noChaos);
await ChaosMonkey.ChaosAsync(noChaos);
Assert.Throws <ChaosException>(() => ChaosMonkey.Chaos(fullChaos));
Assert.ThrowsAsync <ChaosException>(async() => await ChaosMonkey.ChaosAsync(fullChaos));
}
private ScannedImage TransferImage(WiaBackgroundEventLoop eventLoop, int pageNumber, out bool cancel)
{
try
{
var transfer = ScanParams.NoUI ? backgroundWiaTransfer : foregroundWiaTransfer;
ChaosMonkey.MaybeError(0, new COMException("Fail", -2147467259));
using (var stream = transfer.Transfer(pageNumber, eventLoop, WiaApi.Formats.BMP))
{
if (stream == null)
{
cancel = true;
return(null);
}
cancel = false;
using (Image output = Image.FromStream(stream))
{
using (var result = scannedImageHelper.PostProcessStep1(output, ScanProfile))
{
if (blankDetector.ExcludePage(result, ScanProfile))
{
return(null);
}
ScanBitDepth bitDepth = ScanProfile.UseNativeUI ? ScanBitDepth.C24Bit : ScanProfile.BitDepth;
var image = new ScannedImage(result, bitDepth, ScanProfile.MaxQuality, ScanProfile.Quality);
image.SetThumbnail(thumbnailRenderer.RenderThumbnail(result));
scannedImageHelper.PostProcessStep2(image, result, ScanProfile, ScanParams, pageNumber);
return(image);
}
}
}
}
catch (NoPagesException)
{
if (ScanProfile.PaperSource != ScanSource.Glass && pageNumber == 1)
{
// No pages were in the feeder, so show the user an error
throw new NoPagesException();
}
// At least one page was scanned but now the feeder is empty, so exit normally
cancel = true;
return(null);
}
catch (ScanDriverException)
{
throw;
}
catch (Exception e)
{
throw new ScanDriverUnknownException(e);
}
}
static void Main(string[] args)
{
var bus = new TopicBasedPubSub();
var orderPrinter = new OrderPrinter();
var cashier = new Cashier(bus);
var assitantManager = new QueuedHandle <PriceOrder>("AssistantManager", new AssistantManager(bus));
var db = new ConcurrentDictionary <Guid, OrderDocument>();
var jesse = new QueuedHandle <CookFood>("Cook:Jesse", new Cook("Jesse", 600, db, bus));
var walt = new QueuedHandle <CookFood>("Cook:Walt", new Cook("Walt", 700, db, bus));
var gus = new QueuedHandle <CookFood>("Cook:Gus", new Cook("Gus", 1500, db, bus));
var dispatcher = new MoreFairDispatcher <CookFood>("FairDispatcher", new[] { jesse, walt, gus });
var chaosMonkey = new ChaosMonkey <CookFood>(25, 25, dispatcher);
var alarmClock = new AlarmClock(bus);
var startables = new List <IStartable> {
assitantManager, jesse, walt, gus, dispatcher, alarmClock
};
var waiter = new Waiter("Heisenberg", bus);
var house = new MinionHouse(bus);
bus.Subscribe(chaosMonkey);
bus.Subscribe(assitantManager);
bus.Subscribe(cashier);
bus.Subscribe <OrderPlaced>(house);
bus.Subscribe <OrderCompleted>(house);
bus.Subscribe(orderPrinter);
bus.Subscribe(alarmClock);
startables.ForEach(x => x.Start());
for (var i = 0; i < 50; i++)
{
waiter.PlaceOrder(new LineItem("Crystal Meth", 3));
Console.WriteLine("Order placed");
}
Console.WriteLine("Getting outstanding orders");
Task.Run(() => GetOutstandingOrdersAndPay(cashier));
Task.Run(() => StartMonitoringQueueDepthsAsync(startables));
StartMonitoringMinionHouseAsync(house).Wait();
}
private async Task <(ScannedImage, bool)> TransferImage(WiaBackgroundEventLoop eventLoop, int pageNumber)
{
return(await Task.Factory.StartNew(() =>
{
try
{
ChaosMonkey.MaybeError(0, new COMException("Fail", -2147467259));
using (var stream = DoTransfer(pageNumber, eventLoop, WiaApi.Formats.BMP))
{
if (stream == null)
{
return (null, true);
}
using (Image output = Image.FromStream(stream))
{
using (var result = scannedImageHelper.PostProcessStep1(output, ScanProfile))
{
if (blankDetector.ExcludePage(result, ScanProfile))
{
return (null, false);
}
ScanBitDepth bitDepth = ScanProfile.UseNativeUI ? ScanBitDepth.C24Bit : ScanProfile.BitDepth;
var image = new ScannedImage(result, bitDepth, ScanProfile.MaxQuality, ScanProfile.Quality);
scannedImageHelper.PostProcessStep2(image, result, ScanProfile, ScanParams, pageNumber);
string tempPath = scannedImageHelper.SaveForBackgroundOcr(result, ScanParams);
scannedImageHelper.RunBackgroundOcr(image, ScanParams, tempPath);
return (image, false);
}
}
}
}
catch (NoPagesException)
{
if (ScanProfile.PaperSource != ScanSource.Glass && pageNumber == 1)
{
// No pages were in the feeder, so show the user an error
throw new NoPagesException();
}
// At least one page was scanned but now the feeder is empty, so exit normally
return (null, true);
}
}, TaskCreationOptions.LongRunning));
}
public async Task ShouldNotThrowOrDelayWhenNotEnabled()
{
// Disable the monkey, it will be restored to its original state no matter what in TearDown.
ChaosMonkey.IsEnabled = false;
ChaosScenario fullChaos = new ChaosScenario("Full Chaos", failureRate: 1.0, delay: 1000);
var sw = Stopwatch.StartNew();
// Expect no delays or exceptions when disabled
sw.Restart();
ChaosMonkey.Chaos(fullChaos);
Assert.Less(sw.ElapsedMilliseconds, 10, "No chaos resulted in an unexpected delay.");
sw.Restart();
await ChaosMonkey.ChaosAsync(fullChaos);
Assert.Less(sw.ElapsedMilliseconds, 10, "No chaos resulted in an unexpected delay.");
}