Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Data.Linq/Provider/IDataServices.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+using System.Linq;
+using System.Text;
+
+namespace System.Data.Linq.Provider {
+    using System.Data.Linq.Mapping;
+
+    internal interface IDataServices {
+        DataContext Context { get; }
+        MetaModel Model { get; }
+        IDeferredSourceFactory GetDeferredSourceFactory(MetaDataMember member);
+        object GetCachedObject(Expression query);
+        bool IsCachedObject(MetaType type, object instance);
+        object InsertLookupCachedObject(MetaType type, object instance);
+        void OnEntityMaterialized(MetaType type, object instance);
+    }
+
+    internal interface IDeferredSourceFactory {
+        IEnumerable CreateDeferredSource(object instance);
+        IEnumerable CreateDeferredSource(object[] keyValues);
+    }
+}