Adding Retry.

AsyncRx.NET/System.Reactive.Async.Linq/System/Reactive/Linq/Operators/Retry.cs

@@ -0,0 +1,69 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information. 
+
+using System.Linq;
+using System.Reactive.Disposables;
+
+namespace System.Reactive.Linq
+{
+    partial class AsyncObservable
+    {
+        public static IAsyncObservable<TSource> Retry<TSource>(this IAsyncObservable<TSource> source)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+
+            return Create<TSource>(async observer =>
+            {
+                var (sink, inner) = AsyncObserver.Retry(observer, source);
+
+                var subscription = await source.SubscribeSafeAsync(sink).ConfigureAwait(false);
+
+                return StableCompositeAsyncDisposable.Create(subscription, inner);
+            });
+        }
+
+        public static IAsyncObservable<TSource> Retry<TSource>(this IAsyncObservable<TSource> source, int retryCount)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+            if (retryCount < 0)
+                throw new ArgumentOutOfRangeException(nameof(retryCount));
+
+            return Create<TSource>(async observer =>
+            {
+                var (sink, inner) = AsyncObserver.Retry(observer, source, retryCount);
+
+                var subscription = await source.SubscribeSafeAsync(sink).ConfigureAwait(false);
+
+                return StableCompositeAsyncDisposable.Create(subscription, inner);
+            });
+        }
+    }
+
+    partial class AsyncObserver
+    {
+        public static (IAsyncObserver<TSource>, IAsyncDisposable) Retry<TSource>(IAsyncObserver<TSource> observer, IAsyncObservable<TSource> source)
+        {
+            if (observer == null)
+                throw new ArgumentNullException(nameof(observer));
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+
+            return Catch(observer, Repeat(source).GetEnumerator());
+        }
+
+        public static (IAsyncObserver<TSource>, IAsyncDisposable) Retry<TSource>(IAsyncObserver<TSource> observer, IAsyncObservable<TSource> source, int retryCount)
+        {
+            if (observer == null)
+                throw new ArgumentNullException(nameof(observer));
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+            if (retryCount < 0)
+                throw new ArgumentOutOfRangeException(nameof(retryCount));
+
+            return Catch(observer, Enumerable.Repeat(source, retryCount).GetEnumerator());
+        }
+    }
+}