LogicalTxnStoredStructs.h

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00001 /*
00002 // $Id: //open/dev/fennel/txn/LogicalTxnStoredStructs.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_LogicalTxnStoredStructs_Included
00025 #define Fennel_LogicalTxnStoredStructs_Included
00026 
00027 #include "fennel/segment/SegStream.h"
00028 
00029 FENNEL_BEGIN_NAMESPACE
00030 
00031 class LogicalTxnParticipant;
00032 
00033 // NOTE:  read comments on struct StoredNode before modifying
00034 // the structs below
00035 
00039 struct FENNEL_TXN_EXPORT LogicalTxnSavepoint
00040 {
00044     FileSize cbLogged;
00045 
00049     uint cbActionPrev;
00050 };
00051 
00055 struct FENNEL_TXN_EXPORT LogicalTxnEventMemento
00056 {
00057     enum Event {
00058         EVENT_ROLLBACK,
00059         EVENT_COMMIT,
00060         EVENT_CHECKPOINT
00061     };
00062 
00066     Event event;
00067 
00071     TxnId txnId;
00072 
00076     SegStreamPosition logPosition;
00077 
00082     bool longLog;
00083 
00087     uint cbActionLast;
00088 
00092     uint nParticipants;
00093 };
00094 
00098 struct FENNEL_TXN_EXPORT LogicalTxnActionHeader
00099 {
00106     LogicalTxnParticipant *pParticipant;
00107 
00112     LogicalActionType actionType;
00113 
00118     uint cbActionPrev;
00119 };
00120 
00125 struct FENNEL_TXN_EXPORT LogicalTxnLogCheckpointMemento
00126 {
00130     SegStreamPosition logPosition;
00131 
00135     uint nUncommittedTxns;
00136 
00140     TxnId nextTxnId;
00141 };
00142 
00148 static const LogicalActionType ACTION_TXN_DESCRIBE_PARTICIPANT = -1;
00149 
00155 static const LogicalActionType ACTION_TXN_ROLLBACK_TO_SAVEPOINT = -2;
00156 
00157 FENNEL_END_NAMESPACE
00158 
00159 #endif
00160 
00161 // End LogicalTxnStoredStructs.h

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