public AsyncLifetimeManager(Func <Task> initialization, bool executeOnCallingThread = true)
{
var options = GetOptions(executeOnCallingThread);
_underlyingManager = new DisposableAsyncLazy <byte>(
factory: AsFactory(initialization),
options);
}
public async Task FactoryTest()
{
var lazy = new DisposableAsyncLazy <byte>(
cancellation => { return(Task.FromResult <byte>(12)); },
_ => { throw null; },
DisposableAsyncLazyOptions.None);
Assert.AreEqual(12, await lazy);
}
public void IsNotAutostartedTest()
{
var lazy = new DisposableAsyncLazy <byte>(
_ => { throw null; },
_ => { throw null; },
DisposableAsyncLazyOptions.None);
Assert.IsFalse(lazy.IsStarted);
}
public async Task AutostartTest()
{
var lazy = new DisposableAsyncLazy <byte>(
cancellation => { return(Task.FromResult <byte>(12)); },
_ => { throw null; },
DisposableAsyncLazyOptions.Autostart);
Assert.IsTrue(lazy.IsStarted);
Assert.AreEqual(12, await lazy);
}
public async Task DisposeIfNotYetStartedTest()
{
var disposeCalled = false;
var lazy = new DisposableAsyncLazy <byte>(
_ => { return(Task.FromResult <byte>(12)); },
p => { Assert.AreEqual(12, p); disposeCalled = true; return(Task.CompletedTask); },
DisposableAsyncLazyOptions.None);
await lazy.DisposeAsync();
Assert.IsFalse(disposeCalled);
}
public async Task DisposalThrowsTest()
{
var lazy = new DisposableAsyncLazy <byte>(
_ => { return(Task.FromResult <byte>(12)); },
p => { throw new Exception(); },
DisposableAsyncLazyOptions.None);
await lazy;
await Assert.ThrowsExceptionAsync <Exception>(async() =>
{
await lazy.DisposeAsync();
});
}
public async Task DisposalThrowsTest()
{
var lazy = new DisposableAsyncLazy <byte>(
_ => { return(Task.FromResult <byte>(12)); },
p => { throw new CustomException(); },
DisposableAsyncLazyOptions.None);
await lazy;
await Assert.ThrowsExceptionAsync <CustomException>(async() =>
{
await lazy.DisposeAsync();
});
Assert.AreEqual(TaskStatus.RanToCompletion, lazy.GetDisposeTask().Status);
}
//[TestMethod]
public async Task ExecuteOnCallingThreadTest()
{
using (var context = new AsyncContext())
{
SynchronizationContext.SetSynchronizationContext(context.SynchronizationContext);
var threadId = Thread.CurrentThread.ManagedThreadId;
var lazy = new DisposableAsyncLazy <byte>(
cancellation =>
{
Assert.AreEqual(threadId, Thread.CurrentThread.ManagedThreadId);
return(Task.FromResult <byte>(12));
},
_ => { throw null; },
DisposableAsyncLazyOptions.None);
await lazy;
}
}
public async Task RetryOnFailureTest()
{
var @try = 1;
var lazy = new DisposableAsyncLazy <byte>(
cancellation =>
{
if (@try == 1)
{
@try++;
throw new Exception();
}
return(Task.FromResult <byte>(12));
},
_ => { throw null; },
DisposableAsyncLazyOptions.RetryOnFailure);
Assert.IsFalse(lazy.IsStarted);
await Assert.ThrowsExceptionAsync <Exception>(async() => await lazy);
Assert.AreEqual(12, await lazy);
}
public static Task GetDisposeTask <T>(this DisposableAsyncLazy <T> instance)
{
var field = typeof(DisposableAsyncLazy <T>).GetField("_disposeTask", BindingFlags.NonPublic | BindingFlags.Instance);
return(field.GetValue(instance) as Task);
}