--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/resourcemgmt/hwresourcesmgr/server/inc/HWRMPSChangeObserver.h	Tue Feb 02 00:53:00 2010 +0200
@@ -0,0 +1,141 @@
+/*
+* Copyright (c) 2006-2009 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:
+*
+*/
+
+
+
+
+/**
+ @file
+ @internalTechnology 
+*/
+
+#ifndef HWRMPSCHANGEOBSERVER_H
+#define HWRMPSCHANGEOBSERVER_H
+
+// INCLUDES
+#include <e32base.h>
+#include <e32property.h>
+
+// FORWARD DECLARATIONS
+// None
+
+/**
+*  An interface the developer implements for handling notification events. 
+*
+*/
+class MHWRMPSChangeObserver
+    {    
+    public:
+        
+        /** 
+        * Called when the PS value changes.
+        * Note that if the value changes
+        * very rapidly, some state transitions might be missed.
+        * It is however guaranteed that latest state is always obtained.
+        *
+        * @param aUid Uid of the changed property
+        * @param aKey Property identifier
+        * @param aValue Indicates latest value
+		*/
+        virtual void PSValueChanged(const TUid& aUid, TUint32 aKey, TInt aValue) = 0;
+	};
+
+/**
+* Active object wrapper for Publish and Subscribe one-shot notification handling.
+* Listens for changes in light status and notifies the client.
+*
+*/
+class CHWRMPSChangeObserver : public CActive
+    {
+    public:
+
+        /**
+        * This is a two-phase constructor method that is used to
+        * create a new instance of CHWRMPSChangeObserver.
+        * A newly created instance immediately starts listening to PS value changes.
+        *
+        * @param aCallback Reference to a callback instance.
+        * @param aUid Uid of the changed property
+        * @param aKey Property identifier
+        * @return          A pointer to a new instance of the CHWRMPSChangeObserver class.
+        */
+        static CHWRMPSChangeObserver* NewL(MHWRMPSChangeObserver& aCallback,
+                                      const TUid& aUid,
+                                      TUint32 aKey);
+
+        /**
+        * This is a two-phase constructor method that is used to
+        * create a new instance of CHWRMPSChangeObserver.
+        * A newly created instance immediately starts listening to PS value changes.
+        * Leaves the constructed instance to cleanup stack. 
+        *
+        * @param aCallback Reference to a callback instance.
+        * @param aUid Uid of the changed property
+        * @param aKey Property identifier
+        * @return          A pointer to a new instance of the CHWRMPSChangeObserver class.
+        */
+        static CHWRMPSChangeObserver* NewLC(MHWRMPSChangeObserver& aCallback,
+                                      const TUid& aUid,
+                                      TUint32 aKey);
+
+        /**
+        * Destructor.
+        */
+        virtual ~CHWRMPSChangeObserver();
+
+    protected:
+
+        // From CActive
+        void RunL();
+        TInt RunError(TInt aError);
+        void DoCancel();
+
+    private:
+
+        /**
+        * Constructor
+        *
+        * @param aCallback Reference to a callback instance.
+        * @param aUid Uid of the changed property
+        * @param aKey Property identifier
+        */
+        CHWRMPSChangeObserver(MHWRMPSChangeObserver& aCallback,
+                              const TUid& aUid,
+                              TUint32 aKey);
+                                                   
+        /**
+        * By default Symbian 2nd phase constructor is private.
+        */
+        void ConstructL();
+
+        /*
+        * Order notification
+        */
+        void OrderNotification();
+       
+    private:
+        
+        MHWRMPSChangeObserver& iCallback;       // not owned by this class
+        RProperty              iProperty;       // P&S property
+        TUid                   iUid;            // Uid of the property
+        TUint32                iKey;            // Property identifier
+
+    };
+
+#endif      // HWRMVIBRASTATUSOBSERVER_H
+
+// End of File