public void RegisteredCallbacks_AreInvokedExactlyOnce()
{
// Arrange
var firstCancellationTokenSource = new CancellationTokenSource();
var secondCancellationTokenSource = new CancellationTokenSource();
var thirdCancellationTokenSource = new CancellationTokenSource();
var firstCancellationToken = firstCancellationTokenSource.Token;
var secondCancellationToken = secondCancellationTokenSource.Token;
var thirdCancellationToken = thirdCancellationTokenSource.Token;
var firstCancellationChangeToken = new CancellationChangeToken(firstCancellationToken);
var secondCancellationChangeToken = new CancellationChangeToken(secondCancellationToken);
var thirdCancellationChangeToken = new CancellationChangeToken(thirdCancellationToken);
var compositeChangeToken = new CompositeChangeToken(new List <IChangeToken> {
firstCancellationChangeToken, secondCancellationChangeToken, thirdCancellationChangeToken
});
var count1 = 0;
var count2 = 0;
compositeChangeToken.RegisterChangeCallback(_ => count1++, null);
compositeChangeToken.RegisterChangeCallback(_ => count2++, null);
// Act
firstCancellationTokenSource.Cancel();
secondCancellationTokenSource.Cancel();
// Assert
Assert.Equal(1, count1);
Assert.Equal(1, count2);
}
public async Task RegisteredCallbackGetsInvokedExactlyOnce_WhenMultipleConcurrentChangeEventsOccur()
{
// Arrange
var event1 = new ManualResetEvent(false);
var event2 = new ManualResetEvent(false);
var event3 = new ManualResetEvent(false);
var cancellationTokenSource = new CancellationTokenSource();
var cancellationToken = cancellationTokenSource.Token;
var cancellationChangeToken = new CancellationChangeToken(cancellationToken);
var count = 0;
Action <object> callback = _ =>
{
count++;
event3.Set();
event1.WaitOne(5000);
};
var compositeChangeToken = new CompositeChangeToken(new List <IChangeToken> {
cancellationChangeToken
});
compositeChangeToken.RegisterChangeCallback(callback, null);
// Act
var firstChange = Task.Run(() =>
{
event2.WaitOne(5000);
cancellationTokenSource.Cancel();
});
var secondChange = Task.Run(() =>
{
event3.WaitOne(5000);
cancellationTokenSource.Cancel();
event1.Set();
});
event2.Set();
await Task.WhenAll(firstChange, secondChange);
// Assert
Assert.Equal(1, count);
}
public void ShouldNotCollectDisposablesIfChangedTokenEncountered()
{
// Arrange
var firstCancellationTokenSource = new CancellationTokenSource();
var secondCancellationTokenSource = new CancellationTokenSource();
var thirdCancellationTokenSource = new CancellationTokenSource();
var count = 0;
var compositeChangeToken = new CompositeChangeToken(new List <IChangeToken> {
new ProxyCancellationChangeToken(firstCancellationTokenSource.Token, disposing: () => count++),
new ProxyCancellationChangeToken(secondCancellationTokenSource.Token, disposing: () => count++),
new ProxyCancellationChangeToken(thirdCancellationTokenSource.Token, disposing: () => count++)
});
// Act
firstCancellationTokenSource.Cancel();
compositeChangeToken.RegisterChangeCallback(_ => { }, null);
secondCancellationTokenSource.Cancel();
// Assert
Assert.Equal(1, count);
}