internal static Behavior <TResult> LiftBehaviorsImpl <T, T2, TResult>(
this IReadOnlyCollection <T2> b,
Func <IReadOnlyList <T>, TResult> f)
where T2 : Behavior <T>
{
return(TransactionInternal.Apply(
(trans1, _) =>
{
Stream <Action <T[]> > @out = new Stream <Action <T[]> >(
new FanOutKeepListenersAlive(b.Select(behavior => behavior.KeepListenersAlive)));
Lazy <TResult> initialValue =
new Lazy <TResult>(() => f(b.Select(behavior => behavior.SampleNoTransaction()).ToArray()));
IReadOnlyList <IListener> listeners = b.Select(
(behavior, i) => behavior.Updates()
.Listen(
@out.Node,
trans1,
(trans2, v) => @out.Send(trans2, vv => vv[i] = v),
false))
.ToArray();
return @out.Coalesce(trans1, (x, y) => x + y)
.MapImpl(
a =>
{
T[] values = b.Select(behavior => behavior.SampleNoTransaction()).ToArray();
a(values);
return f(values);
})
.UnsafeAttachListener(ListenerInternal.CreateCompositeImpl(listeners))
.HoldLazyInternal(trans1, initialValue);
},
false));
}
public Cleanup(Action cleanup)
{
Stream <UnitInternal> stream = StreamInternal.NeverImpl <UnitInternal>();
stream.AttachListenerImpl(ListenerInternal.CreateFromAction(cleanup));
this.stream = stream;
}
private Stream <T> Merge(TransactionInternal trans, Stream <T> s)
{
Stream <T> @out = new Stream <T>(this.KeepListenersAlive);
Node <T> left = new Node <T>();
Node <T> right = @out.Node;
(bool changed, Node <T> .Target nodeTarget) = left.Link(trans, (t, v) => { }, right);
if (changed)
{
trans.SetNeedsRegenerating();
}
Action <TransactionInternal, T> h = @out.Send;
IListener l1 = this.Listen(left, h);
IListener l2 = s.Listen(right, h);
return(@out.UnsafeAttachListener(l1)
.UnsafeAttachListener(l2)
.UnsafeAttachListener(ListenerInternal.CreateFromNodeAndTarget(left, nodeTarget)));
}
public static IStrongListener CreateStrongComposite(IReadOnlyList <IStrongListener> listeners) => ListenerInternal.CreateStrongCompositeImpl(listeners);
public static IWeakListener CreateWeakComposite(IReadOnlyList <IWeakListener> listeners) => ListenerInternal.CreateWeakCompositeImpl(listeners);