internetradio2.0/networkcontrollerinc/irdatatransfertracker.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 19 Apr 2010 14:01:53 +0300
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/*
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* Copyright (c) 2008-2008 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:  Tracks data transmitted through a network connection.
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*
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*/
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#ifndef C_CIRDATATRANSFERTRACKER_H
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#define C_CIRDATATRANSFERTRACKER_H
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#include <mhttpfilter.h>
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#include "irdatatransferobserver.h"
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/**
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 * Tracks data transmitted through a network connection.
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 *
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 * Data sent or received over HTTP sessions are logged with the implemented HTTP filter.
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 * For raw sockets, the implementation requires that the user of the socket notifies
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 * him of data transfer explicitly.
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 */
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NONSHARABLE_CLASS( CIRDataTransferTracker )
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    : public CBase, public MIRDataTransferTracker, public MHTTPFilter
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    {
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public:
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    /**
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     * Two-phased constructor.
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     *
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     * @return  The created object. Transfers ownership.
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     */
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    static CIRDataTransferTracker*  NewL( );
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    /**
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     * Destructor.
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     */
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    ~CIRDataTransferTracker();
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// from base class MIRDataTransferTracker
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   void SetObserver( MIRDataTransferObserver* );
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    const TIRDataTransferPckg& TransferredData() const;
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    void BindL( RHTTPSession , TIRTransferCategory );
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    void RawDataTransferredL( TInt , TInt , TIRTransferCategory );
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// from base class MHTTPFilter
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    void MHFRunL( RHTTPTransaction aTransaction, const THTTPEvent& aEvent );
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private:
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    /**
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     * Constructor.
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     */
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    CIRDataTransferTracker();
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    /**
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     * Second-phase constructor.
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     */
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    void ConstructL() const;
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    /**
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     * Calculates the header field sizes in bytes from the specified headers.
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     *
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     * @param   aTransaction        HTTP transaction for the headers.
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     * @param   aHeaders            Headers to calculate the size from.
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     * @return  Size of the headers in bytes.
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     */
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    TInt HeaderSize(const RHTTPTransaction aTransaction, RHTTPHeaders aHeaders );
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    /**
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     * Parses the header sizes (both request and response) of the supplied HTTP transaction,
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     * logging it under the specified category.
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     *
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     * @param   aTransaction        Transaction to parse the headers from.
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     * @param   aCategory           Transfer category to record the data under.
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     */
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    void ParseHeaderSizeL(const RHTTPTransaction aTransaction, TIRTransferCategory aCategory );
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    /**
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     * Parses the body size of the supplied HTTP transaction, logging it under the specified category.
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     *
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     * @param   aTransaction        Transaction to parse the headers from.
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     * @param   aCategory           Transfer category to record the data under.
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     */
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    void ParseBodySizeL(const RHTTPTransaction aTransaction, TIRTransferCategory aCategory );
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    /**
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     * Processes raw data sent and/or received via the connection.
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     *
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     * @param   aBytesSent          The number of bytes that were sent.
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     * @param   aBytesReceived      The number of bytes that were received.
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     * @param   aCategory           Transfer category to record the data under.
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     */
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    void ProcessDataL( TInt aBytesSent, TInt aBytesReceived, TIRTransferCategory aCategory );
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    /**
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     * Dispatches the notification of the data transfer conditionally.
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     *
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     * If the threshold between the last notification's data transfer amount and the current
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     * data transfer amount is not exceeded, then no notification is dispatched.
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     */
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    void DispatchNotificationL();
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private:
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    /**
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     * Data transfer observer.
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     * Not owned.
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     */
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    MIRDataTransferObserver* iObserver;
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    /**
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     * Persistent storage for the data amounts transferred.
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     */
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    MIRDataTransferTracker::TIRDataTransferPckg iPckg;
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    /**
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     * The amount of bytes transferred since last notification was dispatched.
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     */
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    TInt iBytesSinceLastNotification;
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    /**
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     * The flag to determine Byte Counter crossed first threshold
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     */
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	TBool bThresholdCrossed;
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    };
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#endif // C_CIRDATATRANSFERTRACKER_H