UniRx 에셋 추가

Gameton-06/Assets/Plugins/UniRx/Scripts/Operators/Switch.cs

@@ -0,0 +1,130 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace UniRx.Operators
+{
+    internal class SwitchObservable<T> : OperatorObservableBase<T>
+    {
+        readonly IObservable<IObservable<T>> sources;
+
+        public SwitchObservable(IObservable<IObservable<T>> sources)
+            : base(true)
+        {
+            this.sources = sources;
+        }
+
+        protected override IDisposable SubscribeCore(IObserver<T> observer, IDisposable cancel)
+        {
+            return new SwitchObserver(this, observer, cancel).Run();
+        }
+
+        class SwitchObserver : OperatorObserverBase<IObservable<T>, T>
+        {
+            readonly SwitchObservable<T> parent;
+
+            readonly object gate = new object();
+            readonly SerialDisposable innerSubscription = new SerialDisposable();
+            bool isStopped = false;
+            ulong latest = 0UL;
+            bool hasLatest = false;
+
+            public SwitchObserver(SwitchObservable<T> parent, IObserver<T> observer, IDisposable cancel) : base(observer, cancel)
+            {
+                this.parent = parent;
+            }
+
+            public IDisposable Run()
+            {
+                var subscription = parent.sources.Subscribe(this);
+                return StableCompositeDisposable.Create(subscription, innerSubscription);
+            }
+
+            public override void OnNext(IObservable<T> value)
+            {
+                var id = default(ulong);
+                lock (gate)
+                {
+                    id = unchecked(++latest);
+                    hasLatest = true;
+                }
+
+                var d = new SingleAssignmentDisposable();
+                innerSubscription.Disposable = d;
+                d.Disposable = value.Subscribe(new Switch(this, id));
+            }
+
+            public override void OnError(Exception error)
+            {
+                lock (gate)
+                {
+                    try { observer.OnError(error); }
+                    finally { Dispose(); }
+                }
+            }
+
+            public override void OnCompleted()
+            {
+                lock (gate)
+                {
+                    isStopped = true;
+                    if (!hasLatest)
+                    {
+                        try { observer.OnCompleted(); }
+                        finally { Dispose(); }
+                    }
+                }
+            }
+
+            class Switch : IObserver<T>
+            {
+                readonly SwitchObserver parent;
+                readonly ulong id;
+
+                public Switch(SwitchObserver observer, ulong id)
+                {
+                    this.parent = observer;
+                    this.id = id;
+                }
+
+                public void OnNext(T value)
+                {
+                    lock (parent.gate)
+                    {
+                        if (parent.latest == id)
+                        {
+                            parent.observer.OnNext(value);
+                        }
+                    }
+                }
+
+                public void OnError(Exception error)
+                {
+                    lock (parent.gate)
+                    {
+                        if (parent.latest == id)
+                        {
+                            parent.observer.OnError(error);
+                        }
+                    }
+                }
+
+                public void OnCompleted()
+                {
+                    lock (parent.gate)
+                    {
+                        if (parent.latest == id)
+                        {
+                            parent.hasLatest = false;
+                            if (parent.isStopped)
+                            {
+                                parent.observer.OnCompleted();
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}