internal static Stream <T> SwitchSImpl <T, T2>(this Behavior <T2> bsa) where T2 : Stream <T>
{
return(TransactionInternal.Apply(
(trans1, _) =>
{
Stream <T> @out = new Stream <T>(bsa.KeepListenersAlive);
MutableListener currentListener = new MutableListener();
void HInitial(TransactionInternal trans2, Stream <T> sa)
{
IListener cl = currentListener;
cl.Unlisten();
currentListener.SetListenerImpl(sa.Listen(@out.Node, trans2, @out.Send, false));
}
void H(TransactionInternal trans2, Stream <T> sa)
{
trans2.Last(
() =>
{
IListener cl = currentListener;
cl.Unlisten();
currentListener.SetListenerImpl(sa.Listen(@out.Node, trans2, @out.Send, true));
});
}
trans1.Prioritized(new Node <T>(), trans2 => HInitial(trans2, bsa.SampleNoTransaction()));
IListener l1 = bsa.Updates().Listen(new Node <T>(), trans1, H, false);
return @out.UnsafeAttachListener(l1).UnsafeAttachListener(currentListener);
},
false));
}
internal Stream <TResult> SnapshotImpl <T1, T2, TResult>(Behavior <T1> b1, Behavior <T2> b2, Func <T, T1, T2, TResult> f)
{
Stream <TResult> @out = new Stream <TResult>(this.KeepListenersAlive);
IListener l = this.Listen(
@out.Node,
(trans2, a) => @out.Send(trans2, f(a, b1.SampleNoTransaction(), b2.SampleNoTransaction())));
return(@out.UnsafeAttachListener(l));
}
