natfw/natfwturnplugin/inc/natfwturnrefreshtimer.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:04:58 +0200
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/*
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* Copyright (c) 2006 - 2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:    Sends keepalive messages to TURN Client in order to keep
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*                allocation in TURN Server alive
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*
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*/
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#ifndef C_NATFWTURNREFRESHTIMER_H
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#define C_NATFWTURNREFRESHTIMER_H
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#include <e32base.h>
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class MNATFWRefreshObserver;
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/**
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 *  Sends keepalive messages to TURN Client.
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 *
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 *  Sends keepalive messages to TURN Client in order to keep
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 *  allocation in TURN Server alive. Gets interval in microseconds from 
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 *  CNATFWTurnPlugin. 
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 *
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 *  @lib turnplugin.lib
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 *  @since S60 v3.2
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 */
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class CNATFWTurnRefreshTimer : public CActive
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    {
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public:
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    /**
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     * Creates a new instance of NAT FW TURN Refresh Timer.
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     *
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     * @since S60 v3.2
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     * @param aObserver Observer for callbacks to timer's user
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     * @return A new instance, ownership is transferred.
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     */
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    static CNATFWTurnRefreshTimer* NewL( MNATFWRefreshObserver&aObserver );
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    /**
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     * Creates a new instance of NAT FW TURN Refresh Timer and
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     * pushes it to CleanupStack.
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     *
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     * @since S60 v3.2
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     * @param aObserver Observer for callbacks to timer's user
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     * @return A new instance, ownership is transferred.
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     */    
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    static CNATFWTurnRefreshTimer* NewLC( MNATFWRefreshObserver&aObserver );
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    ~CNATFWTurnRefreshTimer();
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    /**
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     * Waits for given time (aInterval) and calls SetActive().
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     * If interval is 0, timer is cancelled.
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     *
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     * @since S60 v3.2
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     * @param aInterval Interval in microseconds
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     */
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    void StartTurnRefresh( TUint aInterval );
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    /**
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     * Client can query if refresh is going on.
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     *
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     * @since S60 v3.2
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     * @return ETrue if refreshing
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     */
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    TBool IsRunning() const;
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protected:
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    /**
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     * from CActive
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     */
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    void RunL();
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    /**
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     * from CActive
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     */
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    void DoCancel();
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private:
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    CNATFWTurnRefreshTimer( MNATFWRefreshObserver&aObserver );
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    void ConstructL();
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private: // data
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    /**
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     * Interval in microseconds
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     */
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    TUint iInterval;
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    /**
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     * Asynchronous timer service.
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     */
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    RTimer iTimer;
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    /**
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     * MNATFWRefreshObserver reference.
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     */
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    MNATFWRefreshObserver& iObserver;
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    };
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#endif // C_NATFWTURNREFRESHTIMER_H