webengine/osswebengine/cache/inc/HttpCacheHandler.h
author Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
Fri, 08 May 2009 08:25:06 +0300
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/*
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* Copyright (c) 2006 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 the License "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:  Definition of CHttpCacheHandler
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*
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*/
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#ifndef CHTTPCACHEHANDLER_H
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#define CHTTPCACHEHANDLER_H
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//  INCLUDES
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#include <e32base.h>
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#include <BrCtlDefs.h>
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#include <http\rhttpsession.h>
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#include <stringpool.h>
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// CONSTANTS
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// MACROS
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// DATA TYPES
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// FUNCTION PROTOTYPES
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// FORWARD DECLARATIONS
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class CHttpCacheEntry;
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class CHttpCacheLookupTable;
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class CHttpCacheStreamHandler;
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class RHTTPTransaction;
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class RHTTPHeaders;
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class RStringPool;
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class MHTTPDataSupplier;
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class CIdle;
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class CHttpCacheEvictionHandler;
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class THttpCacheEntry;
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class CHttpCacheObserver;
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// CLASS DECLARATION
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/**
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*
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*  @lib
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*  @since 3.1
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*/
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class CHttpCacheHandler : public CBase
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    {
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    public:  // Constructors and destructor
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        /**
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        * Two-phased constructor.
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        * @since 3.1
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        * @param
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        * @param
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        * @return CacheHandler object.
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        */
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        static CHttpCacheHandler* NewL( TInt aSize, 
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            const TDesC& aDirectory,
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            const TDesC& aIndexFile,
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            TInt aCriticalLevel );
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        /**
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        * Destructor.
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        */
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        virtual ~CHttpCacheHandler();
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    public: // new functions
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt RequestL( RHTTPTransaction& aTrans, TBrCtlDefs::TBrCtlCacheMode aCacheMode, THttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt RequestHeadersL( RHTTPTransaction& aTrans, THttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        HBufC8* RequestNextChunkL( RHTTPTransaction& aTrans, TBool& aLastChunk, THttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void ReceivedResponseHeadersL( RHTTPTransaction& aTrans, THttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void ReceivedResponseBodyDataL( RHTTPTransaction& aTrans, MHTTPDataSupplier& aBodyDataSupplier, THttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void ResponseComplete( RHTTPTransaction& aTrans, THttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void RequestClosed( RHTTPTransaction* aTrans, THttpCacheEntry& aCacheEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt RemoveAllL();
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        /**
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        *
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        * @since 7.1
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        * @param
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        * @return
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        */
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        TInt CHttpCacheHandler::ListFiles(RPointerArray<TDesC>& aFilenameList);
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt RemoveL( const TDesC8& aUrl );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool Find( const TDesC8& aUrl );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool SaveL( const TDesC8& aUrl, const TDesC8& aHeader, const TDesC8& aContent );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt AddHeaderL( const TDesC8& aUrl, const TDesC8& aName, const TDesC8& aValue );
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        /**
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        * Some time response time form the origin server is not matching
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        * with GMt time. Adjust the response time.
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void AdjustResponseTime(RHTTPTransaction& aTrans);
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        /**
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        * Some other application modified the cache and the lookup table needs to be updated
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void UpdateLookupTable();
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    private:
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        /**
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        * Construct.
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        * @since 3.1
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        * @param
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        * @param
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        * @return CacheHandler object.
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        */
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        CHttpCacheHandler( TInt aSize );
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        /**
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        * By default Symbian 2nd phase constructor is private.
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        */
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        void ConstructL( const TDesC& aDirectory, const TDesC& aIndexFile,  TInt aCriticalLevel);
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    private: //
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        /**
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        * Some other application modified the cache and the lookup table needs to be updated
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void UpdateLookupTableL();
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @param
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        * @return
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        */
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        TBool CacheNeedsValidationL( CHttpCacheEntry& aCacheEntry, RHTTPTransaction& aTrans, TBrCtlDefs::TBrCtlCacheMode aCacheMode );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @param
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parents:
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        * @return
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        */
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        TBool CacheNeedsSpaceL( TInt aSize );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @param
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        * @return
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        */
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        TBool IsCacheable( RHTTPTransaction& aTrans, TBool& aProtectedEntry );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @param
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        * @return
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        */
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        TBool HandleResponseOkL( CHttpCacheEntry& aEntry, RHTTPTransaction& aTrans );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @param
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        * @return
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        */
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        TBool HandleResponseNotModifiedL( CHttpCacheEntry& aEntry, RHTTPTransaction& aTrans );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @param
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        * @return
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        */
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        void SaveLookupTableL();
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @param
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        * @return
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        */
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        void OpenLookupTableL();
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @param
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        * @return
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        */
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        void OpenLookupTableL(CHttpCacheLookupTable* aLookupTable);
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @param
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        * @return
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        */
1
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        void DeleteCacheEntry( CHttpCacheEntry& aEntry, TBool aUpdate = ETrue );
0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @param
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        * @return
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        */
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        TBool SaveBuffer( CHttpCacheEntry& aEntry, const TDesC8& aBuffer, TBool aBody = EFalse );
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    private:    // Data
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        // hash table for cache entries
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        CHttpCacheLookupTable*          iLookupTable;   // owned
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        // stream manager
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        CHttpCacheStreamHandler*        iStreamHandler; // owned
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        //
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        CHttpCacheEvictionHandler*      iEvictionHandler; // owned
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        // cache size
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        TInt                            iSize;
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        // cache directory
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        HBufC*                          iDirectory; // owned
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        // name of the index file
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        HBufC*                          iIndexFile; // owned
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        // Observing changes in cache
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        CHttpCacheObserver* iHttpCacheObserver; // owned
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    	// An opened and configured file server session
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    	RFs iRfs;
0
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    };
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#endif      // CHTTPCACHEHANDLER_H
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// End of File