diff -r 6369bfd1b60d -r 08b5eae9f9ff upnpavcontroller/upnprenderingstatemachine/inc/upnprenderingoperationexecutor.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/upnpavcontroller/upnprenderingstatemachine/inc/upnprenderingoperationexecutor.h	Wed Nov 03 11:45:09 2010 +0200
@@ -0,0 +1,77 @@
+/*
+* Copyright (c) 2007,2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  An interface that executes rendering operations
+*
+*/
+
+#ifndef C_UPNPRENDERINGOPERATIONEXECUTOR_H
+#define C_UPNPRENDERINGOPERATIONEXECUTOR_H
+
+// INCLUDES
+#include <e32base.h>
+
+// FORWARD DECLARATIONS
+class TUpnpRenderingOperation;
+
+/**
+ * An interface that is able to receive rendering operation items
+ * and execute them. The interface is being used by the rendering
+ * operation queue class.
+ */
+NONSHARABLE_CLASS( MUpnpRenderingOperationExecutor )
+    {
+    public:
+        
+        /**
+         * Result of executing or processing an item
+         */
+        enum TResult
+            {
+            EQueue = 0, // Wait until other operations finished first
+            EContinue = 1, // operation started and it will continue
+            ECompleted = 2 // operation finished
+            };
+        
+        /**
+         * Executes a new operation
+         * @param aOperation new operation to execute
+         * @param aCurrent operation currently ongoing,
+                or ENone if we are idle
+         * @return EQueue if can't execute in parallel,
+         *   ECompleted if finished, or
+         *   EContinue if this operation will continue running
+         */
+        virtual TResult ExecuteOperationL(
+            const TUpnpRenderingOperation& aOperation,
+            const TUpnpRenderingOperation& aCurrent ) = 0;
+
+        /**
+         * Processes an operation with some abstract input
+         */
+        virtual TResult ProcessOperationL(
+            const TUpnpRenderingOperation& aOperation, TInt aEvent,
+            TInt aError, const TAny* aParam1, const TAny* aParam2 ) = 0;
+
+        /**
+         * Executor should handle an error that occurred in ExecuteOperationL
+         * @param aOperation currently ongoing operation, the one that failed
+         * @param aError the error code
+         */
+        virtual void HandleAsyncError(
+            const TUpnpRenderingOperation& aOperation, TInt aLeave ) = 0;
+
+    };
+
+#endif // C_UPNPRENDERINGOPERATIONEXECUTOR_H
+