public IEnumerable<FeaturedMovies> GetFeaturedMovies(out IChangeToken expirationToken)
{
_featuredMoviesTokenSource = new CancellationTokenSource();
expirationToken = new CancellationChangeToken(_featuredMoviesTokenSource.Token);
return GetMovies().OrderBy(m => m.Rank).Take(2);
}
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 void AsyncLocalsNotCapturedAndRestored()
{
// Capture clean context
var executionContext = ExecutionContext.Capture();
var cancellationTokenSource = new CancellationTokenSource();
var cancellationToken = cancellationTokenSource.Token;
var cancellationChangeToken = new CancellationChangeToken(cancellationToken);
var executed = false;
// Set AsyncLocal
var asyncLocal = new AsyncLocal <int>();
asyncLocal.Value = 1;
// Register Callback
cancellationChangeToken.RegisterChangeCallback(al =>
{
// AsyncLocal not set, when run on clean context
// A suppressed flow runs in current context, rather than restoring the captured context
Assert.Equal(0, ((AsyncLocal <int>)al).Value);
executed = true;
}, asyncLocal);
// AsyncLocal should still be set
Assert.Equal(1, asyncLocal.Value);
// Check AsyncLocal is not restored by running on clean context
ExecutionContext.Run(executionContext, cts => ((CancellationTokenSource)cts).Cancel(), cancellationTokenSource);
// AsyncLocal should still be set
Assert.Equal(1, asyncLocal.Value);
Assert.True(executed);
}
public IChangeToken GetToken(string key)
{
return _changeTokens.GetOrAdd(
key,
_ =>
{
var cancellationTokenSource = new CancellationTokenSource();
var changeToken = new CancellationChangeToken(cancellationTokenSource.Token);
return new ChangeTokenInfo(changeToken, cancellationTokenSource);
}).ChangeToken;
}
public string GetProducts(string category, out IChangeToken changeToken)
{
var token = _tokenSource.IsCancellationRequested ?
CancellationToken.None : _tokenSource.Token;
changeToken = new CancellationChangeToken(token);
if (category == "Books")
{
return "Book1, Book2";
}
else
{
return "Laptops";
}
}
public string GetCriticsQuote(out IChangeToken expirationToken)
{
_quotesTokenSource = new CancellationTokenSource();
var quotes = new[]
{
"A must see for iguana lovers everywhere",
"Slightly better than watching paint dry",
"Never felt more relieved seeing the credits roll",
"Bravo!"
};
expirationToken = new CancellationChangeToken(_quotesTokenSource.Token);
return quotes[_random.Next(0, quotes.Length)];
}
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 ProxyCancellationChangeToken(CancellationToken cancellationToken, Action disposing)
{
_cancellationChangeToken = new CancellationChangeToken(cancellationToken);
_disposing = disposing;
}
public void FindView_InvokesViewLocationExpanders_IfChangeTokenExpires()
{
// Arrange
var cancellationTokenSource = new CancellationTokenSource();
var changeToken = new CancellationChangeToken(cancellationTokenSource.Token);
var page = Mock.Of<IRazorPage>();
var pageFactory = new Mock<IRazorPageFactoryProvider>();
pageFactory
.Setup(p => p.CreateFactory("viewlocation3"))
.Returns(new RazorPageFactoryResult(new[] { changeToken }));
var expander = new Mock<IViewLocationExpander>();
var expandedLocations = new[]
{
"viewlocation1",
"viewlocation2",
"viewlocation3",
};
expander
.Setup(v => v.PopulateValues(It.IsAny<ViewLocationExpanderContext>()))
.Callback((ViewLocationExpanderContext expanderContext) =>
{
expanderContext.Values["somekey"] = "somevalue";
})
.Verifiable();
expander
.Setup(v => v.ExpandViewLocations(
It.IsAny<ViewLocationExpanderContext>(),
It.IsAny<IEnumerable<string>>()))
.Returns(expandedLocations)
.Verifiable();
var viewEngine = CreateViewEngine(
pageFactory.Object,
expanders: new[] { expander.Object });
var context = GetActionContext(_controllerTestContext);
// Act - 1
var result = viewEngine.FindView(context, "MyView", isMainPage: true);
// Assert - 1
Assert.False(result.Success);
Assert.Equal(expandedLocations, result.SearchedLocations);
expander.Verify();
// Act - 2
pageFactory
.Setup(p => p.CreateFactory("viewlocation3"))
.Returns(new RazorPageFactoryResult(() => page, new IChangeToken[0]));
cancellationTokenSource.Cancel();
result = viewEngine.FindView(context, "MyView", isMainPage: true);
// Assert - 2
Assert.True(result.Success);
var view = Assert.IsType<RazorView>(result.View);
Assert.Same(page, view.RazorPage);
expander.Verify(
v => v.PopulateValues(It.IsAny<ViewLocationExpanderContext>()),
Times.Exactly(2));
expander.Verify(
v => v.ExpandViewLocations(It.IsAny<ViewLocationExpanderContext>(), It.IsAny<IEnumerable<string>>()),
Times.Exactly(2));
}
public void FindView_InvokesPageFactoryIfViewStartExpirationTokensHaveExpired()
{
// Arrange
var page1 = Mock.Of<IRazorPage>();
var page2 = Mock.Of<IRazorPage>();
var viewStart = Mock.Of<IRazorPage>();
var sequence = new MockSequence();
var cancellationTokenSource = new CancellationTokenSource();
var changeToken = new CancellationChangeToken(cancellationTokenSource.Token);
var pageFactory = new Mock<IRazorPageFactoryProvider>();
pageFactory
.InSequence(sequence)
.Setup(p => p.CreateFactory("/Views/bar/baz.cshtml"))
.Returns(new RazorPageFactoryResult(() => page1, new IChangeToken[0]));
pageFactory
.InSequence(sequence)
.Setup(p => p.CreateFactory("/Views/_ViewStart.cshtml"))
.Returns(new RazorPageFactoryResult(new[] { changeToken }))
.Verifiable();
pageFactory
.InSequence(sequence)
.Setup(p => p.CreateFactory("/Views/bar/baz.cshtml"))
.Returns(new RazorPageFactoryResult(() => page2, new IChangeToken[0]));
pageFactory
.InSequence(sequence)
.Setup(p => p.CreateFactory("/Views/_ViewStart.cshtml"))
.Returns(new RazorPageFactoryResult(() => viewStart, new IChangeToken[0]));
var viewEngine = CreateViewEngine(pageFactory.Object);
var context = GetActionContext(_controllerTestContext);
// Act 1
var result1 = viewEngine.FindView(context, "baz", isMainPage: true);
// Assert 1
Assert.True(result1.Success);
var view1 = Assert.IsType<RazorView>(result1.View);
Assert.Same(page1, view1.RazorPage);
Assert.Empty(view1.ViewStartPages);
// Act 2
cancellationTokenSource.Cancel();
var result2 = viewEngine.FindView(context, "baz", isMainPage: true);
// Assert 2
Assert.True(result2.Success);
var view2 = Assert.IsType<RazorView>(result2.View);
Assert.Same(page2, view2.RazorPage);
var actualViewStart = Assert.Single(view2.ViewStartPages);
Assert.Equal(viewStart, actualViewStart);
pageFactory.Verify();
}
public void FindView_DoesNotExpireCachedResults_IfViewStartsExpire()
{
// Arrange
var pageFactory = new Mock<IRazorPageFactoryProvider>();
var page = Mock.Of<IRazorPage>();
var viewStart = Mock.Of<IRazorPage>();
var cancellationTokenSource = new CancellationTokenSource();
var changeToken = new CancellationChangeToken(cancellationTokenSource.Token);
pageFactory
.Setup(p => p.CreateFactory("/Views/bar/test-view.cshtml"))
.Returns(new RazorPageFactoryResult(() => page, new IChangeToken[0]));
pageFactory
.Setup(p => p.CreateFactory("/Views/_ViewStart.cshtml"))
.Returns(new RazorPageFactoryResult(() => viewStart, new[] { changeToken }));
var viewEngine = CreateViewEngine(pageFactory.Object);
var context = GetActionContext(_controllerTestContext);
// Act - 1
var result1 = viewEngine.FindView(context, "test-view", isMainPage: false);
// Assert - 1
Assert.True(result1.Success);
var view1 = Assert.IsType<RazorView>(result1.View);
Assert.Same(page, view1.RazorPage);
Assert.Equal("test-view", result1.ViewName);
Assert.Empty(view1.ViewStartPages);
// Act - 2
cancellationTokenSource.Cancel();
var result2 = viewEngine.FindView(context, "test-view", isMainPage: false);
// Assert - 2
Assert.True(result2.Success);
var view2 = Assert.IsType<RazorView>(result2.View);
Assert.Same(page, view2.RazorPage);
pageFactory.Verify(p => p.CreateFactory("/Views/bar/test-view.cshtml"), Times.Once());
}