/*

* 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