mulwidgets/mullogging/inc/mullogchunk.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:56:02 +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:  Logging to chunk wrapper for MC Photos
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*
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*/
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#ifndef T_MULLOGCHUNK_H
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#define T_MULLOGCHUNK_H
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// EXTERNAL INCLUDES
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#include <e32std.h>
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#include <f32file.h>
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/**
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 * RMulLogUtility.
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 * Encapsulates the use of RChunk for log writing
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 */
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NONSHARABLE_CLASS( RMulLogUtility )
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    {
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    public:
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        /**
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         * Opens the log chunk with given name
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         * @param aName, the full name of the chunk
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         * @param aReadOnly, whether to open in readonly or read-write
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         */
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        TInt Open( const TDesC& aName, TBool aReadOnly );
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        /**
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         * Creates the log chunk with given name
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         * @param aName, the full name of the chunk
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         */
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        void CreateL( const TDesC& aName );
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        /**
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         * Closes the opened chunk. This needs to be called
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         * before an object of this class goes out of scope
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         */
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        void Close();
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        /**
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         * @return the size of the log chunk
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         */
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        TInt ChunkSize();
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        /**
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         * @return the chunk unique Id (set by client)
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         */
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        TObjectId Id();
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        /**
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         * Sets the unique id for the log chunk
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         * @param aId the id to set for the chunk
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         */
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        void SetId( TObjectId aId );
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        /**
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         * @return Current chunk write address
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         */
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        TUint8* CurrentAddress();
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        /**
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         * Sets the current write address
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         * @param New write address
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         */
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        void SetCurrentAddress( TUint8* aValue );
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        /**
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         * @return Last address written to file
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         */
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        TUint8* LastLoggedAddress();
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        /**
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         * Sets the last logged address
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         * @param New last logged address
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         */
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        void SetLastLoggedAddress( TUint8* aValue );
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        /**
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         * @return The topmost writable address of the chunk
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         */
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        TUint8* BaseAddress();
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        /**
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         * @return The bottom most writable address of the chunk
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         */
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        TUint8* LastAddress();
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    private:
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        /// Own: chunk to write to
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        RChunk iChunk;
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    };
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/**
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 * RMulLogClient.
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 * Client API for log writing to chunk
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 */
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NONSHARABLE_CLASS( RMulLogClient )
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    {
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    public:
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		/**
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		 * Opens the log chunk with the given unique id
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		 * @param aId unique id for the log writing thread
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		 */
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        IMPORT_C TInt Open( TObjectId aId );
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        /**
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         * Closes the log handle, needs to be called before an
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         * object of this class goes out of scope
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         */
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        IMPORT_C void Close();
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        /**
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         * Writes a descriptor to the log
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         * @param aLogEntry the log entry to write
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         */
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        IMPORT_C void Write( const TDesC8& aLogEntry );
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    private:
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    	/// Own: log utility
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        RMulLogUtility iLogUtility;
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    };
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/**
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 * RMulLogManager.
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 * Management API for log creation and committing to file
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 */
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NONSHARABLE_CLASS( RMulLogManager )
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    {
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    public:
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        /**
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         * Creates the log chunks
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         */
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        IMPORT_C void CreateL();
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        /**
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         * Releases the log chunks
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         */
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		IMPORT_C void Release();
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        /**
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         * Writes the log to a file
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         * One file is created per chunk.
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         * @param aFolder the directory where to store the logs
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         */
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        IMPORT_C void CommitToFileL( const TDesC& aFolder );
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    private:
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		// helper method to write all descriptors of a chunk to a 
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		// file
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        void CommitToFileL( RMulLogUtility& aUtility, RFile& aFile );
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    private:
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    	/// Own: log utility
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        RMulLogUtility iLogUtility1;
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    	/// Own: log utility
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        RMulLogUtility iLogUtility2;    
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        /// Own: file server handle
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        RFs iFs;
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    };
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#endif // T_MULLOGCHUNK_H
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