diff -r 8ee96d21d9bf -r 7e0eff37aedb gssettingsuis/Gs/GSFramework/inc/GSEComNotifier.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gssettingsuis/Gs/GSFramework/inc/GSEComNotifier.h	Wed Sep 01 12:20:44 2010 +0100
@@ -0,0 +1,141 @@
+/*
+* Copyright (c) 2008 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:  GS utilities.
+*
+*/
+
+
+#ifndef GSECOMNOTIFIER_H
+#define GSECOMNOTIFIER_H
+
+#include <e32std.h>
+#include <ecom/ecom.h>
+
+
+
+/**
+ *  Utility class to capsulate active object observing ECOM events.
+ *  MGSEComObserver is provided as easy callback when GS related ECOM events
+ *  occur.
+ *
+ *  @lib GSFramework.lib
+ *  @since S60 5.0
+ */
+class MGSEComObserver
+    {
+public:
+
+    /**
+     * Not really used yet. To provide more extendability.
+     */
+    enum TEComEvent
+        {
+        EPluginRemoved,
+        EPluginAdded
+        };
+
+public:
+    virtual void HandleEComEvent( TEComEvent aEvent ) = 0;
+    };
+
+
+/**
+ *  Utility class capsulating active object for observing ECOM events.
+ *
+ *  @lib GSFramework.lib
+ *  @since S60 5.0
+ */
+NONSHARABLE_CLASS( CGSEComNotifier ) : public CActive
+    {
+public:
+
+    /**
+     * Two-phased constructor.
+     *
+     * @param aObserver Callback object.
+     * @param aImplInfo Initial list of ECOM interfaces against which new list
+     *        is compared when ECOM events occur.
+     */
+    IMPORT_C static CGSEComNotifier* NewL( MGSEComObserver* aObserver,
+                                           RImplInfoPtrArray aImplInfo );
+
+    /**
+     * Destructor.
+     */
+    IMPORT_C virtual ~CGSEComNotifier();
+
+protected: // from CActive
+
+    /**
+     * See base class.
+     */
+    void DoCancel();
+
+    /**
+     * See base class.
+     */
+    void RunL();
+
+    /**
+     * See base class.
+     */
+    TInt RunError( TInt aError );
+
+protected:
+
+private:
+
+    /**
+     * C++ Constructor.
+     *
+     * @param aObserver Callback object.
+     * @param aImplInfo Initial list of ECOM interfaces against which new list
+     *        is compared when ECOM events occur.
+     */
+    CGSEComNotifier( MGSEComObserver* aObserver,
+                     RImplInfoPtrArray aImplInfo );
+
+    /**
+     * 2nd phase constructor.
+     */
+    void ConstructL();
+
+    /**
+     * Issues new request.
+     */
+    void IssueRequest();
+
+    /**
+     * @return Difference between old and new list of GS-plugins. Negative
+     *         number means plugins are removed, positive means plugins are
+     *         added, 0 means no change in plugin count.
+     */
+    TInt PluginCountDeltaL();
+
+private: // data
+
+    // Callback.
+    MGSEComObserver* iObserver;
+
+    // ECom handle.
+    REComSession iEComSession;
+
+    // Stored original plugin info. This will be compared against latest info
+    // for any changes.
+    RImplInfoPtrArray iOriginalImplInfo;
+
+    };
+
+
+#endif // GSECOMNOTIFIER_H