1 files changed, 82 insertions, 0 deletions
diff --git a/Rx/NET/Source/System.Reactive.Linq/Reactive/Linq/Observable/Multicast.cs b/Rx/NET/Source/System.Reactive.Linq/Reactive/Linq/Observable/Multicast.cs
new file mode 100644
index 0000000..4a77300
--- /dev/null
+++ b/Rx/NET/Source/System.Reactive.Linq/Reactive/Linq/Observable/Multicast.cs
@@ -0,0 +1,82 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+#if !NO_PERF
+using System;
+using System.Reactive.Disposables;
+using System.Reactive.Subjects;
+
+namespace System.Reactive.Linq.Observαble
+{
+    class Multicast<TSource, TIntermediate, TResult> : Producer<TResult>
+    {
+        private readonly IObservable<TSource> _source;
+        private readonly Func<ISubject<TSource, TIntermediate>> _subjectSelector;
+        private readonly Func<IObservable<TIntermediate>, IObservable<TResult>> _selector;
+
+        public Multicast(IObservable<TSource> source, Func<ISubject<TSource, TIntermediate>> subjectSelector, Func<IObservable<TIntermediate>, IObservable<TResult>> selector)
+        {
+            _source = source;
+            _subjectSelector = subjectSelector;
+            _selector = selector;
+        }
+
+        protected override IDisposable Run(IObserver<TResult> observer, IDisposable cancel, Action<IDisposable> setSink)
+        {
+            var sink = new _(this, observer, cancel);
+            setSink(sink);
+            return sink.Run();
+        }
+
+        class _ : Sink<TResult>, IObserver<TResult>
+        {
+            private readonly Multicast<TSource, TIntermediate, TResult> _parent;
+
+            public _(Multicast<TSource, TIntermediate, TResult> parent, IObserver<TResult> observer, IDisposable cancel)
+                : base(observer, cancel)
+            {
+                _parent = parent;
+            }
+
+            public IDisposable Run()
+            {
+                var observable = default(IObservable<TResult>);
+                var connectable = default(IConnectableObservable<TIntermediate>);
+                try
+                {
+                    var subject = _parent._subjectSelector();
+                    connectable = new ConnectableObservable<TSource, TIntermediate>(_parent._source, subject);
+                    observable = _parent._selector(connectable);
+                }
+                catch (Exception exception)
+                {
+                    base._observer.OnError(exception);
+                    base.Dispose();
+                    return Disposable.Empty;
+                }
+
+                var subscription = observable.SubscribeSafe(this);
+                var connection = connectable.Connect();
+
+                return new CompositeDisposable(subscription, connection);
+            }
+
+            public void OnNext(TResult value)
+            {
+                base._observer.OnNext(value);
+            }
+
+            public void OnError(Exception error)
+            {
+                base._observer.OnError(error);
+                base.Dispose();
+            }
+
+            public void OnCompleted()
+            {
+                base._observer.OnCompleted();
+                base.Dispose();
+            }
+        }
+    }
+}
+#endif