static CanceledUniTaskCache()
{
var promise = new UniTaskCompletionSource <T>();
promise.TrySetCanceled(CancellationToken.None);
promise.MarkHandled();
Task = promise.Task;
}
public FirstValueToUniTaskObserver(UniTaskCompletionSource <T> promise, SingleAssignmentDisposable disposable, CancellationToken cancellationToken)
{
this.promise = promise;
this.disposable = disposable;
this.cancellationToken = cancellationToken;
if (this.cancellationToken.CanBeCanceled)
{
this.registration = this.cancellationToken.RegisterWithoutCaptureExecutionContext(callback, this);
}
}
public static (UniTask, CancellationTokenRegistration) ToUniTask(this CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
return(UniTask.FromCanceled(cancellationToken), default(CancellationTokenRegistration));
}
var promise = new UniTaskCompletionSource();
return(promise.Task, cancellationToken.RegisterWithoutCaptureExecutionContext(cancellationTokenCallback, promise));
}
public static UniTask <T> FromCanceled <T>(CancellationToken cancellationToken = default)
{
if (cancellationToken == CancellationToken.None)
{
return(CanceledUniTaskCache <T> .Task);
}
else
{
var promise = new UniTaskCompletionSource <T>();
promise.TrySetCanceled(cancellationToken);
promise.MarkHandled();
return(promise.Task);
}
}
public static UniTask <T> ToUniTask <T>(this IObservable <T> source, bool useFirstValue = false,
CancellationToken cancellationToken = default)
{
var promise = new UniTaskCompletionSource <T>();
var disposable = new SingleAssignmentDisposable();
var observer = useFirstValue
? (IObserver <T>) new FirstValueToUniTaskObserver <T>(promise, disposable, cancellationToken)
: (IObserver <T>) new ToUniTaskObserver <T>(promise, disposable, cancellationToken);
try {
disposable.Disposable = source.Subscribe(observer);
}
catch (Exception ex) {
promise.TrySetException(ex);
}
return(promise.Task);
}
internal AsyncLazy(UniTask task)
{
this.taskFactory = null;
this.completionSource = new UniTaskCompletionSource();
this.syncLock = null;
this.initialized = true;
var awaiter = task.GetAwaiter();
if (awaiter.IsCompleted)
{
SetCompletionSource(awaiter);
}
else
{
this.awaiter = awaiter;
awaiter.SourceOnCompleted(continuation, this);
}
}
