1 files changed, 73 insertions, 0 deletions

diff --git a/Rx/NET/Source/System.Reactive.Linq/Reactive/Linq/Observable/TimeInterval.cs b/Rx/NET/Source/System.Reactive.Linq/Reactive/Linq/Observable/TimeInterval.cs
new file mode 100644
index 0000000..dacfa03
--- /dev/null
+++ b/Rx/NET/Source/System.Reactive.Linq/Reactive/Linq/Observable/TimeInterval.cs
@@ -0,0 +1,73 @@
+// 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.Diagnostics;
+using System.Reactive.Concurrency;
+using System.Reactive.Disposables;
+using System.Threading;
+
+namespace System.Reactive.Linq.Observαble
+{
+    class TimeInterval<TSource> : Producer<System.Reactive.TimeInterval<TSource>>
+    {
+        private readonly IObservable<TSource> _source;
+        private readonly IScheduler _scheduler;
+
+        public TimeInterval(IObservable<TSource> source, IScheduler scheduler)
+        {
+            _source = source;
+            _scheduler = scheduler;
+        }
+
+        protected override IDisposable Run(IObserver<System.Reactive.TimeInterval<TSource>> observer, IDisposable cancel, Action<IDisposable> setSink)
+        {
+            var sink = new _(this, observer, cancel);
+            setSink(sink);
+            return sink.Run();
+        }
+
+        class _ : Sink<System.Reactive.TimeInterval<TSource>>, IObserver<TSource>
+        {
+            private readonly TimeInterval<TSource> _parent;
+
+            public _(TimeInterval<TSource> parent, IObserver<System.Reactive.TimeInterval<TSource>> observer, IDisposable cancel)
+                : base(observer, cancel)
+            {
+                _parent = parent;
+            }
+
+            private IStopwatch _watch;
+            private TimeSpan _last;
+
+            public IDisposable Run()
+            {
+                _watch = _parent._scheduler.StartStopwatch();
+                _last = TimeSpan.Zero;
+
+                return _parent._source.Subscribe(this);
+            }
+
+            public void OnNext(TSource value)
+            {
+                var now = _watch.Elapsed;
+                var span = now.Subtract(_last);
+                _last = now;
+                base._observer.OnNext(new System.Reactive.TimeInterval<TSource>(value, span));
+            }
+
+            public void OnError(Exception error)
+            {
+                base._observer.OnError(error);
+                Dispose();
+            }
+
+            public void OnCompleted()
+            {
+                base._observer.OnCompleted();
+                Dispose();
+            }
+        }
+    }
+}
+#endif
\ No newline at end of file