diff -r 000000000000 -r 3ce708148e4d devicediagnostics/devdiagapp/inc/devdiagengineobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/devicediagnostics/devdiagapp/inc/devdiagengineobserver.h	Thu Dec 17 08:40:12 2009 +0200
@@ -0,0 +1,74 @@
+/*
+* Copyright (c) 2007 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:  This is the observer class for the Device Diagnostics 
+*                Application's Engine class.  It is used to propagate engine 
+*                events to UI elements.
+*
+*/
+
+
+#ifndef DEVDIAGENGINEOBSERVER_H
+#define DEVDIAGENGINEOBSERVER_H
+
+/**
+ *  The observer class for the application engine.
+ *
+ *  This class is an abstract interface which is used by the application
+ *  engine to pass events from itself and the diagnostics framework to the UI
+ *  components.
+ */
+class MDevDiagEngineObserver
+    {
+
+public: // Data Types
+
+    /**  An enum which identifies different engine events. */
+    enum TAppEngineCommand
+        {
+        EDevDiagEngineCommandPluginLoadProgress,
+        EDevDiagEngineCommandPluginLoadComplete,
+        EDevDiagEngineCommandRunTimeReqs,
+        EDevDiagEngineCommandTestExecutionBegin,
+        EDevDiagEngineCommandProgressDataUpdated,
+        EDevDiagEngineCommandResultsDataUpdated,
+        EDevDiagEngineCommandSinglePluginExecutionDone,
+        EDevDiagEngineCommandGroupExecutionDone,
+        EDevDiagEngineCommandGroupExecutionProgress,
+        EDevDiagEngineCommandTestExecutionSuspended,
+        EDevDiagEngineCommandTestExecutionCancelled,
+        EDevDiagEngineCommandTestExecutionResumed,
+        EDevDiagEngineCommandObserverChanged,
+        EDevDiagEngineCommandGetLastResults,
+        EDevDiagEngineCommandViewSwitch,
+        EDevDiagEngineCommandExecutionStopping
+        };
+
+
+public: // Pure Virtual Functions
+
+    /**
+     * The observer interface to inform of engine events.
+     *
+     * @param aCommand The engine event.
+     * @param aError Any error code related to the event.
+     * @param aCustom Any data related to the event.  Ownership is not
+     *                transferred.  The format of the data is determined by
+     *                the event type.
+     */
+    virtual void HandleEngineCommandL( TAppEngineCommand aCommand,
+                                       TInt aError,
+                                       TAny* aCustom ) = 0;
+    };
+
+#endif // DEVDIAGENGINEOBSERVER_H