--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/resourcemgmt/hwresourcesmgr/common/inc/pspropertyobserver.h	Tue Feb 02 00:53:00 2010 +0200
@@ -0,0 +1,74 @@
+// 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:
+//
+
+/**
+ @file
+ @internalTechnology 
+*/
+
+
+#ifndef PSPOPERTYOBSERVER_H
+#define PSPOPERTYOBSERVER_H
+
+#include <e32base.h>
+#include <e32property.h>
+
+
+/**
+* Callback interface for property change notification.
+*/
+class MPsPropertyObserver
+    {
+public:
+    /**
+    * Notifies changes in the property value
+    *
+    * @param aKey key for which value changed.
+    * @param aValue new value.
+    * @param aError KErrNone if successful. otherwise on of system-wide error.
+    */
+    virtual void PsPropertyChanged(TInt aKey, TInt aValue, TInt aError) =0;
+    };
+
+/**
+*  This class observes changes in PS-Property value.
+*
+*/
+NONSHARABLE_CLASS(CPsPropertyObserver) : public CActive
+    {
+public:
+    IMPORT_C static CPsPropertyObserver* NewL(const TUid& aGroup, TInt aKey, MPsPropertyObserver& aObserver);
+    IMPORT_C static TInt Get(const TUid& aGroup, TInt aKey, TInt& value);
+    IMPORT_C TInt Get(TInt& value);
+    void Start();
+    ~CPsPropertyObserver();
+        
+private:
+    CPsPropertyObserver(TUid aGroup, TInt aKey, MPsPropertyObserver& aObserver);
+    void ConstructL(const TUid& aGroup);
+    
+protected:
+    void RunL();
+    void DoCancel();
+    
+private:
+    RProperty iProperty;
+    TUid iGroup;
+    TInt iKey;
+    TInt iValue;
+    MPsPropertyObserver& iObserver;
+    };
+
+#endif