public static void ShutdownRequest_Cancelled()
{
var queue = new ManualEventQueue();
queue.Subscribers.Add(
DelegateEventHandler.OnShutdownRequest(
e => e.Cancel = true),
weakRef: false);
// you can only add one request at a time
Assert.True(queue.RequestShutdown());
Assert.False(queue.RequestShutdown());
// cancel the request
Assert.True(queue.HandleNext());
// no shutting down event
Assert.False(queue.HandleNext());
// you can add another request, once the previous one is out of the queue
Assert.True(queue.RequestShutdown());
Assert.True(queue.HandleNext());
Assert.False(queue.HandleNext());
}
public static void ShutdownRequest_NotCancelled()
{
var queue = new ManualEventQueue();
bool shuttingDownDetected = false;
queue.Subscribers.Add(
DelegateEventHandler.OnShuttingDown(
e => shuttingDownDetected = true),
weakRef: false);
// requests are granted by default (Cancel is false)
Assert.True(queue.RequestShutdown());
Assert.True(queue.HandleNext()); // request event
Assert.False(shuttingDownDetected);
Assert.True(queue.HandleNext()); // shutting down event
Assert.True(shuttingDownDetected);
Assert.True(queue.HandleNext()); // shut down event
Assert.False(queue.HandleNext());
Assert.True(queue.IsShutDown);
}
public static void ShutdownRequestHandler()
{
var queue = new ManualEventQueue();
// create subscriber
ShutdownRequestEvent lastEventHandled = null;
var subscriber = DelegateEventHandler.OnShutdownRequest(evnt => lastEventHandled = evnt);
queue.Subscribers.Add(subscriber);
// enqueue and handle event
queue.RequestShutdown();
Assert.Null(lastEventHandled);
Assert.True(queue.HandleNext());
// test subscriber
Assert.NotNull(lastEventHandled);
Assert.True(queue.HandleNext()); // shutting down event
Assert.True(queue.HandleNext()); // shut down event
Assert.True(queue.IsShutDown);
}