/*

* Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:  Definition of CHttpCacheHandler

*

*/

#ifndef CHTTPCACHEHANDLER_H

#define CHTTPCACHEHANDLER_H

//  INCLUDES

#include <e32base.h>

#include <http/rhttpsession.h>

#include <stringpool.h>

// CONSTANTS

// MACROS

// DATA TYPES

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

class CHttpCacheEntry;

class CHttpCacheLookupTable;

class CHttpCacheStreamHandler;

class RHTTPTransaction;

class RHTTPHeaders;

class RStringPool;

class MHTTPDataSupplier;

class CIdle;

class CHttpCacheEvictionHandler;

class THttpCacheEntry;

class CHttpCacheObserver;

class CHttpCacheFileWriteHandler;

class CHttpCacheFileHash;

// CLASS DECLARATION

NONSHARABLE_CLASS( THttpCachePostponeParameters )

    {

    public:

        THttpCachePostponeParameters();

        TBool   iEnabled;

        TInt    iFreeRamThreshold;

        TInt    iImmediateWriteThreshold;

        TInt    iWriteTimeout;

    };

/**

*

*  @lib

*  @since 3.1

*/

class CHttpCacheHandler : public CBase

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        * @since 3.1

        * @param

        * @param

        * @return CacheHandler object.

        */

        static CHttpCacheHandler* NewL( TInt aSize,

            const TDesC& aDirectory,

            const TDesC& aIndexFile,

            TInt aCriticalLevel,

            const THttpCachePostponeParameters& aPostpone);

        /**

        * Destructor.

        */

        virtual ~CHttpCacheHandler();

    public: // new functions

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        TInt RequestL( RHTTPTransaction& aTrans, TBrCtlDefs::TBrCtlCacheMode aCacheMode, THttpCacheEntry& aCacheEntry );

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        TInt RequestHeadersL( RHTTPTransaction& aTrans, THttpCacheEntry& aCacheEntry );

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        HBufC8* RequestNextChunkL( RHTTPTransaction& aTrans, TBool& aLastChunk, THttpCacheEntry& aCacheEntry );

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        void ReceivedResponseHeadersL( RHTTPTransaction& aTrans, THttpCacheEntry& aCacheEntry );

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        void ReceivedResponseBodyDataL( RHTTPTransaction& aTrans, MHTTPDataSupplier& aBodyDataSupplier, THttpCacheEntry& aCacheEntry );

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        void ResponseComplete( RHTTPTransaction& aTrans, THttpCacheEntry& aCacheEntry );

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        void RequestClosed( RHTTPTransaction* aTrans, THttpCacheEntry& aCacheEntry );

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        TInt RemoveAllL();

        /**

        *

        * @since 7.1

        * @param

        * @return

        */

        TInt ListFiles(RPointerArray<TDesC>& aFilenameList);

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        TInt RemoveL( const TDesC8& aUrl );

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        TBool Find( const TDesC8& aUrl );

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        TBool SaveL( const TDesC8& aUrl, const TDesC8& aHeader, const TDesC8& aContent );

        /**

        *

        * @since 3.1

        * @param

        * @return

        */

        TInt AddHeaderL( const TDesC8& aUrl, const TDesC8& aName, const TDesC8& aValue );

        /**

        * Some time response time form the origin server is not matching

        * with GMt time. Adjust the response time.

        *

        * @since 3.1

        * @param

        * @return

        */

        void AdjustResponseTime(RHTTPTransaction& aTrans);

        /**

        * Some other application modified the cache and the lookup table needs to be updated

        *

        * @since 3.1

        * @param

        * @return

        */

        void UpdateLookupTable();

        /**

        *

        * @since 3.1

        * @param

        * @param

        * @return

        */

        void SaveLookupTableL();

    private:

        /**

        * Construct.

        * @since 3.1

        * @param

        * @param

        * @return CacheHandler object.

        */

        CHttpCacheHandler( TInt aSize );

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL( const TDesC& aDirectory, const TDesC& aIndexFile,  TInt aCriticalLevel, const THttpCachePostponeParameters& aPostpone);

    private: //

        /**

        * Some other application modified the cache and the lookup table needs to be updated

        *

        * @since 3.1

        * @param

        * @return

        */

        void UpdateLookupTableL();

        /**

        *

        * @since 3.1

        * @param

        * @param

        * @return

        */

        TBool CacheNeedsValidationL( CHttpCacheEntry& aCacheEntry, RHTTPTransaction& aTrans, TBrCtlDefs::TBrCtlCacheMode aCacheMode );

        /**

        *

        * @since 3.1

        * @param

        * @param

        * @return

        */

        TBool CacheNeedsSpaceL( TInt aSize );

        /**

        *

        * @since 3.1

        * @param

        * @param

        * @return

        */

        TBool IsCacheable( RHTTPTransaction& aTrans, TBool& aProtectedEntry );

        /**

        *

        * @since 3.1

        * @param

        * @param

        * @return

        */

        TBool HandleResponseOkL( CHttpCacheEntry& aEntry, RHTTPTransaction& aTrans );

        /**

        *

        * @since 3.1

        * @param

        * @param

        * @return

        */

        TBool HandleResponseNotModifiedL( CHttpCacheEntry& aEntry, RHTTPTransaction& aTrans );

        /**

        *

        * @since 3.1

        * @param

        * @param

        * @return

        */

        void OpenLookupTableL();

        /**

        *

        * @since 3.1

        * @param

        * @param

        * @return

        */

        void OpenLookupTableL(CHttpCacheLookupTable* aLookupTable);

        /**

        *

        * @since 3.1

        * @param

        * @param

        * @return

        */

        void DeleteCacheEntry( CHttpCacheEntry& aEntry, TBool aUpdate = ETrue );

        /**

        *

        * @since 3.1

        * @param

        * @param

        * @return

        */

        TBool SaveBuffer( CHttpCacheEntry& aEntry, const TDesC8& aBuffer, TBool aBody = EFalse );

        /**

         *

         * @since 7.1

         * @param

         * @return

         */

        void GenerateValidationFilename(TDes& aFilename, const TDesC& aIndexFilename) const;

    public:

        /**

         *

         * @since 7.1

         * @param

         * @return

         */

        void ValidateCacheEntriesL(CHttpCacheFileHash *aDiskContent);

    private:    // Data

        // hash table for cache entries

        CHttpCacheLookupTable*          iLookupTable;   // owned

        // stream manager

        CHttpCacheStreamHandler*        iStreamHandler; // owned

        //

        CHttpCacheEvictionHandler*      iEvictionHandler; // owned

        // cache size

        TInt                            iSize;

        // cache directory

        HBufC*                          iDirectory; // owned

        // name of the index file

        HBufC*                          iIndexFile; // owned

    public:

        // Observing changes in cache

        CHttpCacheObserver* iHttpCacheObserver; // owned

    private:

        // An opened and configured file server session

        RFs iRfs;

        //

        CHttpCacheFileWriteHandler*     iPostponeHandler;   // owned

    };

#endif      // CHTTPCACHEHANDLER_H

// End of File