author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 19 Mar 2010 09:33:35 +0200 | |
changeset 24 | 84a16765cd86 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008-2009 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: |
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* Definition of CJournal |
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* |
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*/ |
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/** |
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@file |
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@released |
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@internalTechnology |
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*/ |
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#ifndef __JOURNAL_H__ |
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#define __JOURNAL_H__ |
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|
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#include <e32base.h> |
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#include <usif/sts/stsdefs.h> |
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#include "journalfile.h" |
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#include "integrityservicesevent.h" |
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class RFs; |
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|
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namespace Usif |
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{ |
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_LIT(KJournalExt, "log"); // extension for journal files on each drive |
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_LIT(KDriveExt, "drv"); // extension for this transaction's drive array |
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|
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/** |
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* The journal stores integrity services events and their related filenames |
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* in files spread across several drives. Each drive has its own journal file |
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* so that recovery of drives can occur independantly. This class handles both |
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* the reading and writing of these files. The filename of each journal is: |
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* |
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* JournalPath|TransactionID |
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* |--------|--------| |
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* ?:\????????\00000000.log |
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* |
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* @released |
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* @internalTechnology |
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*/ |
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class CJournal : public CBase |
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{ |
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public: |
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/** |
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* Constructs a new CJournal |
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* |
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* @code |
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* |
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* TTime currentTime; |
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* currentTime.UniversalTime(); |
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* _LIT(KIntegrityServicesPath, "\\private\\SID\\"); |
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* iIntegrityServices = CIntegrityServices::NewL(currentTime.Int64(), |
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* KIntegrityServicesPath); |
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* |
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* @endcode |
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* |
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* @param aFs reference to the file system provided by CIntegrityServices |
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* @param aLoader reference to the RLoader provided by CIntegrityServices |
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* @param aTransactionID A unique ID provided by the client to |
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* identify this transaction. It is suggested |
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* that the client use the current time as the |
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* unique ID. This value can then be shared |
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* between different processes so that they use |
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* the same journal. |
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* @param aPath The path in which to read and write journal |
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* files. eg "\\private\\SID\\" |
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*/ |
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static CJournal* NewL(RFs& aFs, RLoader& aLoader, TStsTransactionId aTransactionID, const TDesC& aPath); |
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|
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/** |
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* Constructs a new CJournal and places it on the cleanup stack |
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* |
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* @code |
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* |
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* TTime currentTime; |
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* currentTime.UniversalTime(); |
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* _LIT(KIntegrityServicesPath, "\\private\\SID\\"); |
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* iIntegrityServices = CIntegrityServices::NewL(currentTime.Int64(), |
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* KIntegrityServicesPath); |
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* |
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* @endcode |
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* |
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* @param aFs reference to the file system provided by CIntegrityServices |
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* @param aLoader reference to the RLoader provided by CIntegrityServices |
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* @param aTransactionID A unique ID provided by the client to |
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* identify this transaction. It is suggested |
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* that the client use the current time as the |
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* unique ID. This value can then be shared |
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* between different processes so that they use |
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* the same journal. |
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* @param aPath The path in which to read and write journal |
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* files. eg "\\private\\SID\\" |
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*/ |
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static CJournal* NewLC(RFs& aFs, RLoader& aLoader, TStsTransactionId aTransactionID, const TDesC& aPath); |
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|
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virtual ~CJournal(); |
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|
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/** |
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* Notifies Integrity Services that a file or directory is being added |
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* so that it can be removed if a rollback occurs. A record is created |
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* in the journal file on the appropriate drive. |
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* |
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* @param aFileName - Name of file or directory including path |
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*/ |
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void AddL(const TDesC& aFileName); |
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|
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/** |
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* Removes the specified file or directory, first backing it up before |
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* deleting it. A record is created in the journal file on the |
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* appropriate drive. |
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* |
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* @param aFileName - Name of file or directory including path |
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* @param aFileName - the generated backup filename to return |
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*/ |
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void RemoveL(const TDesC& aFileName, TDes& aBackupFileName); |
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|
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/** |
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* Notifies Integrity Services that a file or directory is being added |
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* that must later be removed. A record is created in the journal file |
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* on the appropriate drive. |
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* |
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* @param aFileName - Name of file or directory including path |
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*/ |
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void TemporaryL(const TDesC& aFileName); |
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|
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/** |
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* Commits all journals for this transaction |
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* */ |
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void CommitL(); |
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|
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/** |
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* Performs a file restore operation on a single drive |
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* |
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* @param aDrive The drive to apply this operation to |
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*/ |
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|
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void RestoreFilesL(TInt aDrive); |
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|
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/** |
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* Rolls back the journal on all drives |
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@see CIntegrityServices::RollbackL on explanation for aRecordAllRollbackEvents |
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*/ |
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void RollBackL(TBool aRecordAllRollbackEvents = ETrue); |
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|
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/** |
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* Creates the <sysdrive>:\<journal path>\<transactionID>.drv file's name |
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* This file is used by the journal to keep track of affected drives. |
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* @param aTransactionID The transaction id for which the filename is to be assembled |
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* @param aPath The journal path to be used when assembling the filename. |
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* @param aDrvFileName The assembled fully qualfied filename is returned in this descriptor |
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*/ |
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static void CreateDrvFileNameL(TStsTransactionId aTransactionID, const TDesC& aPath, TDes& aDrvFileName); |
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|
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/** |
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* Creates drive independent journal file name eg: \<journal path>\<transactionID>.<journalfileextension> and appends to aJournalFileName |
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* @param aTransactionID The transaction id for which the filename is to be assembled |
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* @param aPath The journal path to be used when assembling the filename. |
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* @param aJournalFileName The assembled drive independent filename is appended to the end of this descriptor |
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*/ |
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static void CreateJournalFileNameL(TStsTransactionId aTransactionID, const TDesC& aPath, TDes& aJournalFileName); |
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|
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static TInt RecoverTransactionIdFromDrvFileName(const TDesC& aDrvFileName, TStsTransactionId& aTransactionID); |
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|
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private: |
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|
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CJournal(RFs& aFs, RLoader& aLoader); |
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|
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/** |
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* Second phase constructor for CJournal |
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* |
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* @param aTransactionID A unique ID provided by the client to |
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* identify this transaction. It is suggested |
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* that the client use the current time as the |
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* unique ID. This value can then be shared |
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* between different processes so that they use |
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* the same journal. |
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* @param aPath The path in which to read and write journal |
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* files. eg "\\private\\SID\\" |
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*/ |
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void ConstructL(TStsTransactionId aTransactionID, const TDesC& aPath); |
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|
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/** |
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* Closes then deletes all files used by this journal. Records completed |
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* drives to the drives array. |
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*/ |
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void DeleteJournalFilesL(); |
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|
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/** |
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* Removes the journal file from the indicated drive if possible. |
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* @see CIntegrityServices::RollbackL on explanation for aRecordAllRollbackEvents |
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* |
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*/ |
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|
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void DeleteJournalFileL(TInt aDrive, TBool aRecordAllRollbackEvents = ETrue ); |
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|
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/** |
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* Removes the drives file from the system drive for this journal. |
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* |
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*/ |
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void DeleteDrivesFileL(); |
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/** |
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* Reads the array of drives used by this transaction from a file. |
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*/ |
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void RefreshDrivesArrayL(); |
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/** |
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* Opens a CJournalFile object on this drive, locking the journal file |
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* and preventing use by other instances of CIntegrityServices using |
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* the same Transaction ID. If a journal file does not exist it will |
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* be created. |
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* |
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* @param aDrive the drive on which to open the journal file |
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*/ |
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TInt PrepareToWriteL(TInt aDrive); |
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/** |
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* Adds the specified drive to the drives array used by this |
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* transaction an records it in a file. |
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* |
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* @param aDrive the drive to add |
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*/ |
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void UpdateDrivesFileL(TInt aDrive); |
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/** |
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* Performs the initial read of the drives file, and creates journal file |
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* objects for every present drive already used in this transaction. |
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*/ |
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void InitJournalsL(); |
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/** |
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* Closes, then deletes the journal file opened with StartRollbackL(). |
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@see CIntegrityServices::RollbackL on explanation for aRecordAllRollbackEvents |
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*/ |
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void FinishRollbackL(TInt aDrive, TBool aRecordAllRollbackEvents = ETrue ); |
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/** |
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* Returns the last event found in the journal files. |
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* (used to determine how far the installation progressed) |
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* |
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* @return TIntegrityServicesEvent representing the last event in the journal |
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*/ |
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TIntegrityServicesEvent LastEventL() const; |
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/** |
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* Performs a file delete operation on all drives referenced by this journal |
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* |
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* @param aTypeFilter The type of file to apply this operation to |
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* @param aFailType The type of test failure to induce during testing |
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*/ |
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void DeleteFilesL(TIntegrityServicesEvent aTypeFilter); |
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/** |
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* Performs a file delete operation on a single drive |
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* |
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* @param aTypeFilter The type of file to apply this operation to |
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* @param aDrive The drive to apply this operation to |
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* @param aFailType The type of test failure to induce during testing |
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*/ |
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void DeleteFilesL(TIntegrityServicesEvent aTypeFilter, TInt aDrive); |
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/** |
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* Write a journal event to a specific drive |
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* |
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* @param aEvent the TEvent describing the current operation |
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* @param aDrive The drive to write the event to |
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* @param aSerializeEventToJournal Specifies whether the journal event should be serialized |
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*/ |
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void WriteJournalEventL(TIntegrityServicesEvent aEvent, TInt aDrive, TBool aSerializeEventToJournal); |
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/** |
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* Performs recovery of the journal for a particular drive. |
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* |
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* @param aDrive The drive to rollback |
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* @param aRecordAllRollbackEvents @see CIntegrityServices::RollbackL |
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*/ |
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void RollBackDriveL(TInt aDrive, TBool aRecordAllRollbackEvents); |
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/** |
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* Writes the event to all journal files |
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* |
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* @param aEvent the TEvent describing the current operation |
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*/ |
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void WriteJournalEventL(TIntegrityServicesEvent aEvent); |
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/** |
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* Opens all journal file(s) belonging to this transaction, first |
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* reading and verifying the existing contents. The files remain |
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* open (and therefore locked) until FinishCommitL() is called. |
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*/ |
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void StartCommitL(); |
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/* |
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* Closes, then deletes the journal file(s) opened with StartCommitL(). |
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*/ |
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void FinishCommitL(); |
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/** |
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* Retrieves the last event from the journal on a specific drive |
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* |
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* @param aDrive The drive for which to retrieve the last event |
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* @return TIntegrityServicesEvent representing the last event in the journal |
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*/ |
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TIntegrityServicesEvent LastEventL(TInt aDrive) const; |
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/** |
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* Retrieves the matching index in iJournalFiles for a journal which matches aDrive. Returns KErrNotFound if there's no journal for the drive |
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*/ |
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TInt FindJournalFileIndexL(TInt aDrive) const; |
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/** |
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* Reference to opened file server session |
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*/ |
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RFs& iFs; |
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/** |
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* Reference to RLoader server session |
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*/ |
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RLoader& iLoader; |
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/** |
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* The generic journal filename (does not include a drive) |
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*/ |
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TFileName iJournalFileName; |
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/** |
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* The filename for the drives array (located on the system drive) |
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* This file stores the drives used, and drives completed for this |
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* transaction. |
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*/ |
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TFileName iDriveArrayFileName; |
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/** |
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* The array of completed drives for this transaction |
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*/ |
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RArray<TInt> iCompletedDrives; |
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RArray<TInt> iAllDrives; |
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/** |
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* Array of CJournalFile objects |
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*/ |
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RPointerArray<CJournalFile> iJournalFiles; |
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}; |
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} ///namespace |
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#endif |