LogicalRecoveryTxn.h

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00001 /*
00002 // $Id: //open/dev/fennel/txn/LogicalRecoveryTxn.h#10 $
00003 // Fennel is a library of data storage and processing components.
00004 // Copyright (C) 2005-2009 The Eigenbase Project
00005 // Copyright (C) 2005-2009 SQLstream, Inc.
00006 // Copyright (C) 2005-2009 LucidEra, Inc.
00007 // Portions Copyright (C) 1999-2009 John V. Sichi
00008 //
00009 // This program is free software; you can redistribute it and/or modify it
00010 // under the terms of the GNU General Public License as published by the Free
00011 // Software Foundation; either version 2 of the License, or (at your option)
00012 // any later version approved by The Eigenbase Project.
00013 //
00014 // This program is distributed in the hope that it will be useful,
00015 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00017 // GNU General Public License for more details.
00018 //
00019 // You should have received a copy of the GNU General Public License
00020 // along with this program; if not, write to the Free Software
00021 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022 */
00023 
00024 #ifndef Fennel_LogicalRecoveryTxn_Included
00025 #define Fennel_LogicalRecoveryTxn_Included
00026 
00027 #include "fennel/common/VoidPtrHash.h"
00028 
00029 #include <boost/utility.hpp>
00030 
00031 #include <hash_map>
00032 
00033 FENNEL_BEGIN_NAMESPACE
00034 
00035 class LogicalTxnParticipant;
00036 class LogicalTxnParticipantFactory;
00037 struct LogicalTxnSavepoint;
00038 
00043 class FENNEL_TXN_EXPORT LogicalRecoveryTxn
00044     : public boost::noncopyable
00045 {
00046     typedef std::hash_map<
00047         LogicalTxnParticipant *,
00048         SharedLogicalTxnParticipant,
00049         VoidPtrHash> ParticipantMap;
00050     typedef ParticipantMap::iterator ParticipantMapIter;
00051 
00055     SharedByteInputStream pTxnInputStream;
00056 
00061     LogicalTxnParticipantFactory *pParticipantFactory;
00062 
00066     ParticipantMap participantMap;
00067 
00068     bool isOnline() const
00069     {
00070         return pParticipantFactory ? false : true;
00071     }
00072 
00073     void recoverParticipant(
00074         LogicalTxnParticipant *pLoggedParticipant);
00075 
00076     LogicalTxnParticipant *swizzleParticipant(
00077         LogicalTxnParticipant *pParticipant);
00078 
00079 public:
00089     explicit LogicalRecoveryTxn(
00090         SharedByteInputStream pTxnInputStream,
00091         LogicalTxnParticipantFactory *pParticipantFactory);
00092 
00093     virtual ~LogicalRecoveryTxn();
00094 
00100     void redoActions(uint cbRedo);
00101 
00115     void undoActions(
00116         LogicalTxnSavepoint const &svptEnd,
00117         uint nActionsMax = MAXU,
00118         FileSize minActionOffset = 0);
00119 };
00120 
00121 FENNEL_END_NAMESPACE
00122 
00123 #endif
00124 
00125 // End LogicalRecoveryTxn.h

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