1 files changed, 92 insertions, 0 deletions

diff --git a/Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/Do.cs b/Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/Do.cs
new file mode 100644
index 0000000..2f73cfa
--- /dev/null
+++ b/Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/Do.cs
@@ -0,0 +1,92 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+#if !NO_PERF
+using System;
+
+namespace System.Reactive.Linq.Observαble
+{
+    class Do<TSource> : Producer<TSource>
+    {
+        private readonly IObservable<TSource> _source;
+        private readonly Action<TSource> _onNext;
+        private readonly Action<Exception> _onError;
+        private readonly Action _onCompleted;
+
+        public Do(IObservable<TSource> source, Action<TSource> onNext, Action<Exception> onError, Action onCompleted)
+        {
+            _source = source;
+            _onNext = onNext;
+            _onError = onError;
+            _onCompleted = onCompleted;
+        }
+
+        protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
+        {
+            var sink = new _(this, observer, cancel);
+            setSink(sink);
+            return _source.SubscribeSafe(sink);
+        }
+
+        class _ : Sink<TSource>, IObserver<TSource>
+        {
+            private readonly Do<TSource> _parent;
+
+            public _(Do<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
+                : base(observer, cancel)
+            {
+                _parent = parent;
+            }
+
+            public void OnNext(TSource value)
+            {
+                try
+                {
+                    _parent._onNext(value);
+                }
+                catch (Exception ex)
+                {
+                    base._observer.OnError(ex);
+                    base.Dispose();
+                    return;
+                }
+
+                base._observer.OnNext(value);
+            }
+
+            public void OnError(Exception error)
+            {
+                try
+                {
+                    _parent._onError(error);
+                }
+                catch (Exception ex)
+                {
+                    base._observer.OnError(ex);
+                    base.Dispose();
+                    return;
+                }
+
+                base._observer.OnError(error);
+                base.Dispose();
+            }
+
+            public void OnCompleted()
+            {
+                try
+                {
+                    _parent._onCompleted();
+                }
+                catch (Exception ex)
+                {
+                    base._observer.OnError(ex);
+                    base.Dispose();
+                    return;
+                }
+
+                base._observer.OnCompleted();
+                base.Dispose();
+            }
+        }
+    }
+}
+#endif
\ No newline at end of file