diff -r 000000000000 -r ff3b6d0fd310 satengine/SatServer/inc/MSatSystemStateChangeNotifier.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/satengine/SatServer/inc/MSatSystemStateChangeNotifier.h	Tue Feb 02 01:11:09 2010 +0200
@@ -0,0 +1,86 @@
+/*
+* Copyright (c) 2002-2006 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:  Interface for Publish and suscripe change notifier.
+*
+*/
+
+
+
+#ifndef MSATSYSTEMSTATECHANGENOTIFIER_H
+#define MSATSYSTEMSTATECHANGENOTIFIER_H
+
+//  INCLUDES
+#include <e32std.h>
+
+// CONSTANTS
+// Indicates that the observer doesn't want to specify any value, when it should
+// be notified. In this case, the changed value is sent to observer
+const TInt KNotifyValueNotSet = -1;
+
+// CLASS DECLARATION
+
+/**
+*  Change notifier for Publish & Subscribe.
+*
+*  @lib SatSystemState
+*  @since Series 60 3.0
+*/
+class MSatSystemStateChangeNotifier
+    {
+    public:  // Constructors and destructor
+
+        /**
+        * Destructor.
+        */
+        virtual ~MSatSystemStateChangeNotifier() {};
+
+    public: // New functions
+
+        /**
+        * Request a notification of a change in system state.
+        * The request is standing as long as it is canceled.
+        */
+        virtual void NotifyChangeL() = 0;
+
+        /**
+        * Cancels the notification request.
+        */
+        virtual void CancelNotify() = 0;
+        
+        /**
+        * Gets the current value.
+        * @return Current value for earlier request.
+        */
+        virtual TInt GetValueInt() { return KNotifyValueNotSet; };
+
+    protected:  // New functions
+
+        /**
+        * C++ default constructor.
+        */
+        MSatSystemStateChangeNotifier() {};
+
+    private:
+
+        // Prohibit copy constructor if not deriving from CBase.
+        MSatSystemStateChangeNotifier( const MSatSystemStateChangeNotifier& );
+
+        // Prohibit assigment operator if not deriving from CBase.
+        MSatSystemStateChangeNotifier& operator=( const MSatSystemStateChangeNotifier& );
+
+    };
+
+#endif      // MSATSYSTEMSTATECHANGENOTIFIER_H
+
+// End of File