Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.WorkflowServices/System/ServiceModel/Dispatcher/DurableInstance.cs

@@ -0,0 +1,89 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+namespace System.ServiceModel.Dispatcher
+{
+    using System.Runtime;
+    using System.ServiceModel.Channels;
+    using System.ServiceModel.Persistence;
+
+    abstract class DurableInstance : CommunicationObject, IExtension<InstanceContext>
+    {
+        DurableInstanceContextProvider instanceContextProvider;
+        Guid instanceId;
+
+        protected DurableInstance(DurableInstanceContextProvider instanceContextProvider, Guid instanceId)
+        {
+            if (instanceContextProvider == null)
+            {
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("instanceContextProvider");
+            }
+
+            this.instanceId = instanceId;
+            this.instanceContextProvider = instanceContextProvider;
+        }
+
+        public Guid InstanceId
+        {
+            get
+            {
+                return this.instanceId;
+            }
+        }
+
+        protected override TimeSpan DefaultCloseTimeout
+        {
+            get { return PersistenceProvider.DefaultOpenClosePersistenceTimout; }
+        }
+
+        protected override TimeSpan DefaultOpenTimeout
+        {
+            get { return PersistenceProvider.DefaultOpenClosePersistenceTimout; }
+        }
+
+        public void DecrementActivityCount()
+        {
+            instanceContextProvider.DecrementActivityCount(this.instanceId);
+        }
+
+        void IExtension<InstanceContext>.Attach(InstanceContext owner)
+        {
+        }
+
+        void IExtension<InstanceContext>.Detach(InstanceContext owner)
+        {
+        }
+
+        protected override void OnAbort()
+        {
+        }
+
+        protected override IAsyncResult OnBeginClose(TimeSpan timeout, AsyncCallback callback, object state)
+        {
+            return new CompletedAsyncResult(callback, state);
+        }
+
+        protected override IAsyncResult OnBeginOpen(TimeSpan timeout, AsyncCallback callback, object state)
+        {
+            return new CompletedAsyncResult(callback, state);
+        }
+
+        protected override void OnClose(TimeSpan timeout)
+        {
+        }
+
+        protected override void OnEndClose(IAsyncResult result)
+        {
+            CompletedAsyncResult.End(result);
+        }
+
+        protected override void OnEndOpen(IAsyncResult result)
+        {
+            CompletedAsyncResult.End(result);
+        }
+
+        protected override void OnOpen(TimeSpan timeout)
+        {
+        }
+    }
+}