remotestoragefw/remotefileengine/inc/rsfwfiletable.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:07:59 +0200
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/*
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* Copyright (c) 2003-2006 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 "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:  data struct for remote files metadata
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*
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*/
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#ifndef C_RSFWFILETABLE_H
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#define C_RSFWFILETABLE_H
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#include <e32base.h>
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#include <f32file.h>
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#include "rsfwmetadatastore.h"
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class CRsfwVolume;
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class CRsfwFileEntry;
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class TFid;
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class TMetaDataEvent;
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/**  file where permanent metadata is stored */
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_LIT(KMetaDataFileName, "M.dat");
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/**  an entry has been added */
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const TInt KNotifyNodeAdded    = 1;  
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/** an entry has been modified  */
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const TInt KNotifyNodeModified = 2; 
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/**  an entry has been deleted */
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const TInt KNotifyNodeRemoved  = 3; 
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/**  size of the buffer used when writing file entry to permanent metadata */
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const TInt KMaxExternalizedFileEntrySize = 1024;
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/**  internal state bits */
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/** local changes (eg caching bits) */
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const TUint KNodeLocallyDirty      = 0x0001; 
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/** remote changes */
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const TUint KNodeRemotelyDirty     = 0x0002; 
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/** temp mark for various purposes */
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const TUint KNodeMarked            = 0x0004; 
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const TUint KNodeHasValidLock      = 0x0008;
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const TUint KNodeOpenedForWriting  = 0x0010;
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const TUint KNodeWritingCancelled  = 0x0020;
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const TUint KNodePartlyCached      = 0x0100;
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/** indicates that a file that has been
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opened has been created (instead of opening
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an already existing file). This affects
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logic when closing the file (PUT + RENAME
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trick to protect the existing file in case  of
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cancelled PUT is not used)
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 **/
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const TUint KNodeNewlyCreated      = 0x0200;
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class TMetaDataEvent
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    {
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public:
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    TInt        iEvent;    // notified event
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    TInt        iNodeId;   // node id
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    CRsfwFileEntry* iEntry;    // file entry
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    };
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class CRsfwFileTable: public CBase
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    {
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private:
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    enum TMetaDataState
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        {
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        EMetaDataSaveNone = 0,  // meta data saving has not started yet
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        EMetaDataSaveStarted,   // meta data saving has been started
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        EMetaDataSaveFailed     // meta data saving has failed
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        };
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    class TMetaDataSlot
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        {
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    public:
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        TInt        iNodeId;       // node id
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        TInt        iSlotId;       // slot index
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        };
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public: 
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    static CRsfwFileTable* NewL(CRsfwVolume* aVolume, TFileName& aCachePath);
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    inline CRsfwVolume* Volume();
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    inline CRsfwFileEntry* Root();
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    ~CRsfwFileTable();
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    // add node to three
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    void AddL(CRsfwFileEntry* aFep);
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    // remove node from thee
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    void RemoveL(CRsfwFileEntry* aFep);
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    // lookup three
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    CRsfwFileEntry *Lookup(const TFid& aFid);
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    void DumpL(TBool aAll);
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    inline const TBool Permanence() const;
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    void SetPermanenceL(TBool aPermanence);
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    void HandleMetaDataEvent(TInt aEvent, CRsfwFileEntry* aFep);
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    CRsfwFileEntry* LoadMetaDataL();
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    TInt SaveMetaDataDelta();
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    void SetupCacheL();
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    TInt TotalCachedSize();
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    TInt TotalEntryCount();
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    inline TInt OpenFileCount();
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    inline void UpdateOpenFileCount(TInt aDelta);
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    void ResolveDirtyFilesL();
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    void ResolveDirtyFileL(CRsfwFileEntry* aFep);
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private:
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    void ConstructL(CRsfwVolume* aVolume, TFileName& aCachePath);
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    void ClearCacheL();
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    void ConstructL(RReadStream& aStream);
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    TMetaDataEvent* NodeEvent(TInt aNodeId);
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    void AddEvent(TInt aEvent, CRsfwFileEntry* aFep);
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    void RemoveEvent(TInt aNodeId);
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    void LoadNodeL(CRsfwFileEntry*& aFep, TInt &aSlot);
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    void SaveNodeL(CRsfwFileEntry* aFep, TInt &aSlot);
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    void SaveMetaDataDeltaL();
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private:
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    RFs           iFs;                      // inherited from RFE environment
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    TInt          iNodeId;                  // next node id to assign
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    CRsfwVolume*      iVolume;                  // volume info
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    CRsfwFileEntry*   iRootFep;                 // root file entry
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    TFileName     iCachePath;               // cache directory path
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    TBool         iPermanence;              // permanent meta data
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    RArray<TMetaDataEvent> iMetaDataEvents; // dirty entries since last flush
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    CRsfwMetaDataStore* iMetaDataStore;         // permanent store for metadata
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    RArray<TMetaDataSlot> iMetaDataSlots;   // maps file slot to node ids
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    TFileName     iMetaDataFilePath;        // meta data file path
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    TInt          iMetaDataSaveState;       // the state of meta data saving
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    CRsfwFileEntry*   iCurrentParent;           // parent of last looked up entry
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    TInt          iOpenFileCount;           // count of open files
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    };
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#include "rsfwfiletable.inl"
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#endif