/*

* 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: 

*

*/

#include <e32math.h>

#include "natfwstunbinding.h"

#include "cnatbindingstunrefresher.h"

#include "cnatbinding.h"

const TInt KRefreshBaseValue = 900000; // microseconds

const TInt KRefreshVariationRange = 200000; // microseconds

// -----------------------------------------------------------------------------

// CNATBindingSTUNRefresher::CNATBindingSTUNRefresher

// -----------------------------------------------------------------------------

//

CNATBindingSTUNRefresher::CNATBindingSTUNRefresher(

    CDeltaTimer& aDeltaTimer,

    TInt aRefreshInterval,

    MNATBindingRefresherObserver& aObserver,

    CNATBinding& aNATBinding)

    : CNATBindingRefresher(aDeltaTimer,aObserver),

      iNATBinding(aNATBinding),

      iRefreshInterval(aRefreshInterval)

    {

    TTime time;

    time.HomeTime();

    iRandomSeed = time.Int64();

    }

// -----------------------------------------------------------------------------

// CNATBindingSTUNRefresher::~CNATBindingSTUNRefresher

// -----------------------------------------------------------------------------

//

CNATBindingSTUNRefresher::~CNATBindingSTUNRefresher()

    {

    CSTUNBinding* stunBinding = iNATBinding.Binding();

    if (stunBinding)

        {

        stunBinding->CancelRequest();

        }

    }

// -----------------------------------------------------------------------------

// CNATBindingSTUNRefresher::HasSocket

// -----------------------------------------------------------------------------

//

TBool CNATBindingSTUNRefresher::HasSocket(const RSocket& aSocket) const

    {

    CSTUNBinding* stunBinding = iNATBinding.Binding();

    return stunBinding &&

           (aSocket.SubSessionHandle() ==

            stunBinding->Socket().SubSessionHandle());

    }

// -----------------------------------------------------------------------------

// CNATBindingSTUNRefresher::RefreshInterval

// -----------------------------------------------------------------------------

//

TInt CNATBindingSTUNRefresher::RefreshInterval()

    {

    TInt interval = KErrUnderflow;

    if (iRefreshInterval > 0)

        {

        const TInt minValue = iRefreshInterval*KRefreshBaseValue;

        const TInt variantPart = iRefreshInterval*KRefreshVariationRange;

        const TInt rand = Math::Rand(iRandomSeed);

        interval = (minValue+(rand%variantPart));

        }

    return interval;

    }

// -----------------------------------------------------------------------------

// CNATBindingSTUNRefresher::RefreshTimerExpiredL

// -----------------------------------------------------------------------------

//

void CNATBindingSTUNRefresher::RefreshTimerExpiredL()

    {

    __ASSERT_ALWAYS(iNATBinding.Binding(), User::Leave(KErrNotFound));

    iNATBinding.SendSTUNRequestL();

    }

// -----------------------------------------------------------------------------

// CNATBindingSTUNRefresher::CancelRefresh

// -----------------------------------------------------------------------------

//

void CNATBindingSTUNRefresher::CancelRefresh()

    {

    CSTUNBinding* stunBinding = iNATBinding.Binding();

    if (stunBinding)

        {

        stunBinding->CancelRequest();

        }

    }