--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/natplugins/natptraversalcontroller/inc/cnatbindingrefresher.h	Tue Feb 02 01:04:58 2010 +0200
@@ -0,0 +1,91 @@
+/*
+* 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: 
+*
+*/
+
+#ifndef CNATBINDINGREFRESHER_H
+#define CNATBINDINGREFRESHER_H
+
+//  INCLUDES
+#include <e32base.h>
+#include <es_sock.h>
+#include <securesocket.h>
+
+// FORWARD DECLARATIONS
+class MNATBindingRefresherObserver;
+
+// CLASS DECLARATION
+/**
+* A base class for refreshing NAT bindings.
+*/
+class CNATBindingRefresher : public CBase
+    {
+    public:  // Constructors and destructor
+
+        virtual ~CNATBindingRefresher();
+
+    public: // New functions
+
+        virtual TBool PersistentConnectionRequired() const;
+
+        virtual TBool HasSocket( const RSocket& aSocket ) const = 0;
+
+        virtual TBool HasSocket( const CSecureSocket& aSocket ) const;
+
+        void SetRefresh( TBool aRefresh );
+
+        void ContinueRefreshing();
+
+        TBool IsRefreshed() const;
+
+    public: // A callback for CDeltaTimer
+
+        static TInt RefreshTimerExpired( TAny* aPtr );
+
+    protected: // Constructors
+
+        CNATBindingRefresher(
+            CDeltaTimer& aDeltaTimer,
+            MNATBindingRefresherObserver& aObserver );
+
+    protected: // New functions
+
+        virtual TInt RefreshInterval() = 0;
+
+        virtual void RefreshTimerExpiredL() = 0;
+
+        virtual void CancelRefresh() = 0;
+
+    private: // New functions
+
+        void StartTimer();
+        void RefreshNow();
+
+    protected: // Data
+
+        MNATBindingRefresherObserver& iObserver;
+
+    private: // Data
+
+        CDeltaTimer& iDeltaTimer;
+        TCallBack iDeltaTimerCallBack;
+        TDeltaTimerEntry iDeltaTimerEntry;
+        TBool iIsRefreshed;
+        TBool iTimerRunning;
+    };
+
+#endif // CNATBINDINGREFRESHER_H
+
+// End of File