natfw/natfwicecandidatehandler/inc/ciceconnectivitycheck.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 03 May 2010 12:52:41 +0300
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/*
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* Copyright (c) 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:    Performs connectivity check.
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*
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*/
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#ifndef C_CICECONNECTIVITYCHECK_H
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#define C_CICECONNECTIVITYCHECK_H
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#include <e32base.h>
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#include "ciceconnectionhandler.h"
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#include "miceconncheckobserver.h"
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class MIceConnCheckListener;
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class CNATFWCandidatePair;
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class CNATFWCandidate;
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class TInetAddr;
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class CIceSessionData;
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/**
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 *  Performs periodic and triggered end-to-end connectivity checks.
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 *
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 *  Connectivity check consists of STUN-request sending and response
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 *  processing.
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 *
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 *  @lib icecandidatehandler
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 *  @since S60 v3.2
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 */
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class CIceConnectivityCheck 
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    : 
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    public CBase,
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    public MIceConnCheckObserver
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    {
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    UNIT_TEST( UT_CIceConnectivityCheck )
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    UNIT_TEST( UT_CIceCheckList )
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public:
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    /**  ICE check states */
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    enum TIceCheckState
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        {
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        EIceCheckWaiting        = 1,
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        EIceCheckInProgress     = 2,
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        EIceCheckSucceed        = 4,
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        EIceCheckFailed         = 8,
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        EIceCheckFrozen         = 16
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        };
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    /** ICE check types */
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    enum TIceCheckType
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        {
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        EIceCheckTypePeriodic   = 1,
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        EIceCheckTypeTriggered  = 2,
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        EIceCheckTypeNomination = 3
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        };
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    /**
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     * Two-phased constructor.
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     * @param   aClient             The client issuing check
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     * @param   aLocalCand          The local candidate
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     * @param   aRemoteCand         The remote candidate
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     * @param   aConnHandler        The connection handler
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     * @param   aSessionData        The session data
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     */
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    static CIceConnectivityCheck* NewL( 
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        MIceConnCheckListener& aClient,
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        const CNATFWCandidate& aLocalCand,
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        const CNATFWCandidate& aRemoteCand,
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        CIceConnectionHandler& aConnHandler,
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        CIceSessionData& aSessionData );
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    /**
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     * Two-phased constructor.
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     * @param   aClient             The client issuing check
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     * @param   aLocalCand          The local candidate
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     * @param   aRemoteCand         The remote candidate
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     * @param   aConnHandler        The connection handler
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     * @param   aSessionData        The session data
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     */
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    static CIceConnectivityCheck* NewLC(
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        MIceConnCheckListener& aClient,
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        const CNATFWCandidate& aLocalCand,
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        const CNATFWCandidate& aRemoteCand,
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        CIceConnectionHandler& aConnHandler,
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        CIceSessionData& aSessionData );
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    /** 
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     * Destructor.
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     */
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    virtual ~CIceConnectivityCheck();
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    /**
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     * Compare priorities of two connectivity checks.
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     *
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     * @since   S60 v3.2
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     * @param   aA         The first check for comparison
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     * @param   aB         The second check for comparison
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     */
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    static TInt ComparePriorities( 
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        const CIceConnectivityCheck& aA, 
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        const CIceConnectivityCheck& aB );
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    /**
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     * Implements TIdentityRelation regarding transport addresses.
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     *
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     * @since   S60 v3.2
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     * @param   aItem1              The first item for comparison
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     * @param   aItem2              The second item for comparison
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     * @return  ETrue if checks match
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     */
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    static TBool MatchAddresses( 
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        const CIceConnectivityCheck& aItem1, 
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        const CIceConnectivityCheck& aItem2 );
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    /** 
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     * Initializes the check. After that check is ready to be performed.
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     *
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     * @since   S60 v3.2
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     */
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    void Initialize();
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    /**
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     * Executes connectivity check.
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     * 
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     * @since   S60 v3.2
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     * @param   aType           Connectivity check type
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     * @param   aPriority       The priority to be included in the check
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     * @param   aRtoValue       The retransmission timeout value in ms
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     */
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    void PerformConnCheckL( TIceCheckType aType, TUint aPriority, 
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        TUint aRtoValue );
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    /** 
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     * Resends earlier performed connectivity check in order to nominate pair.
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     *
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     * @since   S60 v3.2
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     * @param   aRtoValue       The retransmission timeout value in ms
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     */
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    void PerformNominationL( TUint aRtoValue );
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    /** 
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     * Return whether check is nominated.
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     *
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     * @since   S60 v3.2
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     * @return  ETrue if check is nominated
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     */
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    TBool Nominated() const;
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    /** 
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     * Set information from the remote check received for the same pair.
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     * This information is needed for valid pair construction.
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     *
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     * @since   S60 v3.2
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     * @param   aPriority       Priority of the remote check
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     * @param   aFavored        Favored status from the remote check
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     */
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    void SetRemoteCheckInfo( TUint aPriority, TBool aFavored );
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    /** 
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     * Cancels the check.
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     *
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     * @since   S60 v3.2
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     */
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    void Cancel();
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    /** 
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     * Return stream identifier where this check is done.
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     *
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     * @since   S60 v3.2
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     * @return  Stream identifier
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     */
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    TUint StreamId() const;
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    /** 
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     * Return identifier of the component for which this check is for.
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     *
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     * @since   S60 v3.2
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     * @return  Component identifier
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     */
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    TUint ComponentId() const;
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    /**
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     * Returns stream collection id of the check.
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     * 
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     * @since   S60 v3.2
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     * @return  Stream collection identifier
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     */
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    TUint StreamCollectionId() const;
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    /** 
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     * Return current state of the connectivity check.
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     *
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     * @since   S60 v3.2
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     * @return  Current state
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     */
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    TIceCheckState State() const;
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    /** 
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     * Return candidate pair validated with this check.
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     *
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     * @since   S60 v3.2
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     * @return  Validated candidate pair
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     */
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    const CNATFWCandidatePair* ValidatedPair() const;
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    /** 
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     * Returns candidate pair for which check is created.
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     *
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     * @since   S60 v3.2
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     * @return  Candidate pair
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     */
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    const CNATFWCandidatePair& CandidatePair() const;
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// From base class MIceConnectionObserver
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    void ConnCheckCompletedL(
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        TInt aCompletionCode,
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        const TInetAddr& aLocalAddr,
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        const TInetAddr& aPeerAddr,
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        const TInetAddr& aMappedAddr );
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private:
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    CIceConnectivityCheck( 
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        MIceConnCheckListener& aClient,
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        CIceConnectionHandler& aConnHandler,
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        CIceSessionData& aSessionData );
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    void ConstructL( 
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        const CNATFWCandidate& aLocalCand,
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        const CNATFWCandidate& aRemoteCand );
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    CNATFWCandidatePair* CreateValidatedPairL( 
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        const TInetAddr& aMappedAddr );
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private: // data
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    /**
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     * Current state of the ICE check.
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     */
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    TIceCheckState iState;
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    /**
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     * Type of the connectivity check.
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     */
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    TIceCheckType iType;
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    /**
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     * Priority used with binding request.
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     */
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    TUint iPriority;
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    /**
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     * Priority from check which triggered this check.
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     */
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    TUint iRemotePriority;
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    /** 
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     * Indicates is this pair favored by remote party.
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     */
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    TBool iRemoteFavored;
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    /**
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     * Whether check is nominated.
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     */
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    TBool iIsNominated;
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    /**
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     * Connection used for connectivity checks.
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     */
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    TUint iConnectionId;
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    /**
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     * Indicates that resend has been issued.
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     */
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    TBool iResendInProgress;
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    /**
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     * Client notified about a result of the check.
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     * Not own.
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     */
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    MIceConnCheckListener& iClient;
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    /**
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     * The connection handler.
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     * Not own.
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     */
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    CIceConnectionHandler& iConnHandler;
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    /**
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     * The session data.
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     * Not own.
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     */
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    CIceSessionData& iSessionData;
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    /**
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     * Validated candidate pair.
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     * Own.
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     */
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    CNATFWCandidatePair* iValidatedPair;
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    /**
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     * Pair to test for connectivity.
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     * Own.
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     */
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    CNATFWCandidatePair* iCandidatePair;
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    };
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#endif // C_CICECONNECTIVITYCHECK_H