public static IAsyncObservable <TResult> GroupJoin <TLeft, TRight, TLeftDuration, TRightDuration, TResult>(this IAsyncObservable <TLeft> left, IAsyncObservable <TRight> right, Func <TLeft, IAsyncObservable <TLeftDuration> > leftDurationSelector, Func <TRight, IAsyncObservable <TRightDuration> > rightDurationSelector, Func <TLeft, IAsyncObservable <TRight>, TResult> resultSelector)
{
if (left == null)
{
throw new ArgumentNullException(nameof(left));
}
if (right == null)
{
throw new ArgumentNullException(nameof(right));
}
if (leftDurationSelector == null)
{
throw new ArgumentNullException(nameof(leftDurationSelector));
}
if (rightDurationSelector == null)
{
throw new ArgumentNullException(nameof(rightDurationSelector));
}
if (resultSelector == null)
{
throw new ArgumentNullException(nameof(resultSelector));
}
return(Create <TResult>(async observer =>
{
var subscriptions = new CompositeAsyncDisposable();
var(leftObserver, rightObserver, disposable) = AsyncObserver.GroupJoin(observer, subscriptions, leftDurationSelector, rightDurationSelector, resultSelector);
var leftSubscription = await left.SubscribeSafeAsync(leftObserver).ConfigureAwait(false);
await subscriptions.AddAsync(leftSubscription).ConfigureAwait(false);
var rightSubscription = await right.SubscribeSafeAsync(rightObserver).ConfigureAwait(false);
await subscriptions.AddAsync(rightSubscription).ConfigureAwait(false);
return disposable;
}));
}