namespace System.Reactive.Joins { internal class ActivePlan<T1, T2, T3> : ActivePlan { private readonly Action<T1, T2, T3> onNext; private readonly Action onCompleted; private readonly JoinObserver<T1> first; private readonly JoinObserver<T2> second; private readonly JoinObserver<T3> third; internal ActivePlan(JoinObserver<T1> first, JoinObserver<T2> second, JoinObserver<T3> third, Action<T1, T2, T3> onNext, Action onCompleted) { this.onNext = onNext; this.onCompleted = onCompleted; this.first = first; this.second = second; this.third = third; AddJoinObserver(first); AddJoinObserver(second); AddJoinObserver(third); } internal override void Match() { if (first.Queue.Count > 0 && second.Queue.Count > 0 && third.Queue.Count > 0) { Notification<T1> notification = first.Queue.Peek(); Notification<T2> notification2 = second.Queue.Peek(); Notification<T3> notification3 = third.Queue.Peek(); if (notification.Kind == NotificationKind.OnCompleted || notification2.Kind == NotificationKind.OnCompleted || notification3.Kind == NotificationKind.OnCompleted) onCompleted(); else { Dequeue(); onNext(notification.Value, notification2.Value, notification3.Value); } } } } }