1 files changed, 102 insertions, 0 deletions
diff --git a/Rx.NET/System.Reactive.Core/Reactive/Internal/PlatformEnlightenmentProvider.cs b/Rx.NET/System.Reactive.Core/Reactive/Internal/PlatformEnlightenmentProvider.cs
new file mode 100644
index 0000000..f2483e8
--- /dev/null
+++ b/Rx.NET/System.Reactive.Core/Reactive/Internal/PlatformEnlightenmentProvider.cs
@@ -0,0 +1,102 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using System.ComponentModel;
+using System.Reflection;
+
+namespace System.Reactive.PlatformServices
+{
+    /// <summary>
+    /// (Infrastructure) Interface for enlightenment providers.
+    /// </summary>
+    /// <remarks>
+    /// This type is used by the Rx infrastructure and not meant for public consumption or implementation.
+    /// No guarantees are made about forward compatibility of the type's functionality and its usage.
+    /// </remarks>
+    [EditorBrowsable(EditorBrowsableState.Never)]
+    public interface IPlatformEnlightenmentProvider
+    {
+        /// <summary>
+        /// (Infastructure) Tries to gets the specified service.
+        /// </summary>
+        /// <typeparam name="T">Service type.</typeparam>
+        /// <param name="args">Optional set of arguments.</param>
+        /// <returns>Service instance or null if not found.</returns>
+        T GetService<T>(params object[] args) where T : class;
+    }
+
+    /// <summary>
+    /// (Infrastructure) Provider for platform-specific framework enlightenments.
+    /// </summary>
+    /// <remarks>
+    /// This type is used by the Rx infrastructure and not meant for public consumption or implementation.
+    /// </remarks>
+    [EditorBrowsable(EditorBrowsableState.Never)]
+    public static class PlatformEnlightenmentProvider
+    {
+        private static readonly object s_gate = new object();
+        private static IPlatformEnlightenmentProvider s_current;
+
+        /// <summary>
+        /// (Infrastructure) Gets the current enlightenment provider. If none is loaded yet, accessing this property triggers provider resolution.
+        /// </summary>
+        /// <remarks>
+        /// This member is used by the Rx infrastructure and not meant for public consumption or implementation.
+        /// </remarks>
+        public static IPlatformEnlightenmentProvider Current
+        {
+            get
+            {
+                if (s_current == null)
+                {
+                    lock (s_gate)
+                    {
+                        if (s_current == null)
+                        {
+                            //
+                            // TODO: Investigate whether we can simplify this logic to just use "System.Reactive.PlatformServices.PlatformEnlightenmentProvider, System.Reactive.PlatformServices".
+                            //       It turns out this doesn't quite work on Silverlight. On the other hand, in .NET Compact Framework 3.5, we mysteriously have to use that path.
+                            //
+
+#if NETCF35
+                            var name = "System.Reactive.PlatformServices.CurrentPlatformEnlightenmentProvider, System.Reactive.PlatformServices";
+#else
+#if CRIPPLED_REFLECTION
+                            var ifType = typeof(IPlatformEnlightenmentProvider).GetTypeInfo();
+#else
+                            var ifType = typeof(IPlatformEnlightenmentProvider);
+#endif
+                            var asm = new AssemblyName(ifType.Assembly.FullName);
+                            asm.Name = "System.Reactive.PlatformServices";
+                            var name = "System.Reactive.PlatformServices.CurrentPlatformEnlightenmentProvider, " + asm.FullName;
+#endif
+
+                            var t = Type.GetType(name, false);
+                            if (t != null)
+                                s_current = (IPlatformEnlightenmentProvider)Activator.CreateInstance(t);
+                            else
+                                s_current = new DefaultPlatformEnlightenmentProvider();
+                        }
+                    }
+                }
+
+                return s_current;
+            }
+
+            set
+            {
+                lock (s_gate)
+                {
+                    s_current = value;
+                }
+            }
+        }
+    }
+
+    class DefaultPlatformEnlightenmentProvider : IPlatformEnlightenmentProvider
+    {
+        public T GetService<T>(object[] args) where T : class
+        {
+            return null;
+        }
+    }
+}