public static IObserver <T> Create <T>(Action <T> onNext, Action <Exception> onError, Action onCompleted)
{
return(Observer.Create <T>(onNext, onError, onCompleted, Disposable.Empty));
}
public static IDisposable SubscribeWithState3 <T, TState1, TState2, TState3>(this IObservable <T> source, TState1 state1, TState2 state2, TState3 state3, Action <T, TState1, TState2, TState3> onNext, Action <Exception, TState1, TState2, TState3> onError, Action <TState1, TState2, TState3> onCompleted)
{
return(source.Subscribe(Observer.CreateSubscribeWithState3Observer(state1, state2, state3, onNext, onError, onCompleted)));
}
/// <summary>
/// Returns a task that will receive the last value or the exception produced by the observable sequence.
/// </summary>
/// <typeparam name="TResult">The type of the elements in the source sequence.</typeparam>
/// <param name="observable">Observable sequence to convert to a task.</param>
/// <param name="cancellationToken">Cancellation token that can be used to cancel the task, causing unsubscription from the observable sequence.</param>
/// <param name="state">The state to use as the underlying task's AsyncState.</param>
/// <returns>A task that will receive the last element or the exception produced by the observable sequence.</returns>
/// <exception cref="ArgumentNullException"><paramref name="observable"/> is null.</exception>
public static Task <TResult> ToTask <TResult>(this IObservable <TResult> observable,
CancellationToken cancellationToken, object state)
{
if (observable == null)
{
throw new ArgumentNullException("observable");
}
var hasValue = false;
var lastValue = default(TResult);
var tcs = new TaskCompletionSource <TResult>(state);
var disposable = new SingleAssignmentDisposable();
var ctr = default(CancellationTokenRegistration);
if (cancellationToken.CanBeCanceled)
{
ctr = cancellationToken.Register(() => {
disposable.Dispose();
tcs.TrySetCanceled(cancellationToken);
});
}
var taskCompletionObserver = Observer.Create <TResult>(
value => {
hasValue = true;
lastValue = value;
},
ex => {
tcs.TrySetException(ex);
ctr.Dispose(); // no null-check needed (struct)
disposable.Dispose();
},
() => {
if (hasValue)
{
tcs.TrySetResult(lastValue);
}
else
{
tcs.TrySetException(new InvalidOperationException("Strings_Linq.NO_ELEMENTS"));
}
ctr.Dispose(); // no null-check needed (struct)
disposable.Dispose();
}
);
//
// Subtle race condition: if the source completes before we reach the line below, the SingleAssigmentDisposable
// will already have been disposed. Upon assignment, the disposable resource being set will be disposed on the
// spot, which may throw an exception. (Similar to TFS 487142)
//
try {
//
// [OK] Use of unsafe Subscribe: we're catching the exception here to set the TaskCompletionSource.
//
// Notice we could use a safe subscription to route errors through OnError, but we still need the
// exception handling logic here for the reason explained above. We cannot afford to throw here
// and as a result never set the TaskCompletionSource, so we tunnel everything through here.
//
disposable.Disposable = observable.Subscribe/*Unsafe*/ (taskCompletionObserver);
}
catch (Exception ex) {
tcs.TrySetException(ex);
}
return(tcs.Task);
}
public static IDisposable SubscribeWithState2 <T, TState1, TState2>(this IObservable <T> source, TState1 state1, TState2 state2, Action <T, TState1, TState2> onNext, Action <TState1, TState2> onCompleted)
{
return(source.Subscribe(Observer.CreateSubscribeWithState2Observer(state1, state2, onNext, Stubs <TState1, TState2> .Throw, onCompleted)));
}
public static IDisposable SubscribeWithState3 <T, TState1, TState2, TState3>(this IObservable <T> source, TState1 state1, TState2 state2, TState3 state3, Action <T, TState1, TState2, TState3> onNext)
{
return(source.Subscribe(Observer.CreateSubscribeWithState3Observer(state1, state2, state3, onNext, Stubs <TState1, TState2, TState3> .Throw, Stubs <TState1, TState2, TState3> .Ignore)));
}
public static IDisposable SubscribeWithState2 <T, TState1, TState2>(this IObservable <T> source, TState1 state1, TState2 state2, Action <T, TState1, TState2> onNext, Action <Exception, TState1, TState2> onError)
{
return(source.Subscribe(Observer.CreateSubscribeWithState2Observer(state1, state2, onNext, onError, Stubs <TState1, TState2> .Ignore)));
}
public static IDisposable SubscribeWithState <T, TState>(this IObservable <T> source, TState state, Action <T, TState> onNext, Action <Exception, TState> onError, Action <TState> onCompleted)
{
return(source.Subscribe(Observer.CreateSubscribeWithStateObserver(state, onNext, onError, onCompleted)));
}
public static IDisposable SubscribeWithState <T, TState>(this IObservable <T> source, TState state, Action <T, TState> onNext)
{
return(source.Subscribe(Observer.CreateSubscribeWithStateObserver(state, onNext, Stubs <TState> .Throw, Stubs <TState> .Ignore)));
}
public static IDisposable Subscribe <T>(this IObservable <T> source, Action <T> onNext, Action <Exception> onError, Action onCompleted)
{
return(source.Subscribe(Observer.CreateSubscribeObserver(onNext, onError, onCompleted)));
}
public static IDisposable Subscribe <T>(this IObservable <T> source, Action <T> onNext, Action onCompleted)
{
return(source.Subscribe(Observer.CreateSubscribeObserver(onNext, Stubs.Throw, onCompleted)));
}
