1 files changed, 71 insertions, 0 deletions
diff --git a/Rx/NET/Source/System.Reactive.Core/Reactive/Internal/SafeObserver.cs b/Rx/NET/Source/System.Reactive.Core/Reactive/Internal/SafeObserver.cs
new file mode 100644
index 0000000..2693569
--- /dev/null
+++ b/Rx/NET/Source/System.Reactive.Core/Reactive/Internal/SafeObserver.cs
@@ -0,0 +1,71 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using System;
+
+namespace System.Reactive
+{
+    //
+    // See AutoDetachObserver.cs for more information on the safeguarding requirement and
+    // its implementation aspects.
+    //
+
+    class SafeObserver<TSource> : IObserver<TSource>
+    {
+        private readonly IObserver<TSource> _observer;
+        private readonly IDisposable _disposable;
+
+        public static IObserver<TSource> Create(IObserver<TSource> observer, IDisposable disposable)
+        {
+            var a = observer as AnonymousObserver<TSource>;
+            if (a != null)
+                return a.MakeSafe(disposable);
+            else
+                return new SafeObserver<TSource>(observer, disposable);
+        }
+
+        private SafeObserver(IObserver<TSource> observer, IDisposable disposable)
+        {
+            _observer = observer;
+            _disposable = disposable;
+        }
+
+        public void OnNext(TSource value)
+        {
+            var __noError = false;
+            try
+            {
+                _observer.OnNext(value);
+                __noError = true;
+            }
+            finally
+            {
+                if (!__noError)
+                    _disposable.Dispose();
+            }
+        }
+
+        public void OnError(Exception error)
+        {
+            try
+            {
+                _observer.OnError(error);
+            }
+            finally
+            {
+                _disposable.Dispose();
+            }
+        }
+
+        public void OnCompleted()
+        {
+            try
+            {
+                _observer.OnCompleted();
+            }
+            finally
+            {
+                _disposable.Dispose();
+            }
+        }
+    }
+}