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diff --git a/src/csharp/Grpc.Core/Utils/RecordingQueue.cs b/src/csharp/Grpc.Core/Utils/RecordingQueue.cs
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+++ b/src/csharp/Grpc.Core/Utils/RecordingQueue.cs
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+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+using System.Collections.Concurrent;
+
+namespace Grpc.Core.Utils
+{
+    // TODO: replace this by something that implements IAsyncEnumerator.
+    /// <summary>
+    /// Observer that allows us to await incoming messages one-by-one.
+    /// The implementation is not ideal and class will be probably replaced
+    /// by something more versatile in the future.
+    /// </summary>
+    public class RecordingQueue<T> : IObserver<T>
+    {
+        readonly BlockingCollection<T> queue = new BlockingCollection<T>();
+        TaskCompletionSource<object> tcs = new TaskCompletionSource<object>();
+
+        public void OnCompleted()
+        {
+            tcs.SetResult(null);
+        }
+
+        public void OnError(Exception error)
+        {
+            tcs.SetException(error);
+        }
+
+        public void OnNext(T value)
+        {
+            queue.Add(value);
+        }
+
+        public BlockingCollection<T> Queue
+        {
+            get
+            {
+                return queue;
+            }
+        }
+
+        public Task Finished
+        {
+            get
+            {
+                return tcs.Task;
+            }
+        }
+    }
+}
+