LogicalTxnStoredStructs.h

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/*
// $Id: //open/dev/fennel/txn/LogicalTxnStoredStructs.h#10 $
// Fennel is a library of data storage and processing components.
// Copyright (C) 2005-2009 The Eigenbase Project
// Copyright (C) 2005-2009 SQLstream, Inc.
// Copyright (C) 2005-2009 LucidEra, Inc.
// Portions Copyright (C) 1999-2009 John V. Sichi
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version approved by The Eigenbase Project.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef Fennel_LogicalTxnStoredStructs_Included
#define Fennel_LogicalTxnStoredStructs_Included

#include "fennel/segment/SegStream.h"

FENNEL_BEGIN_NAMESPACE

class LogicalTxnParticipant;

// NOTE:  read comments on struct StoredNode before modifying
// the structs below

struct FENNEL_TXN_EXPORT LogicalTxnSavepoint
{
    FileSize cbLogged;

    uint cbActionPrev;
};

struct FENNEL_TXN_EXPORT LogicalTxnEventMemento
{
    enum Event {
        EVENT_ROLLBACK,
        EVENT_COMMIT,
        EVENT_CHECKPOINT
    };

    Event event;

    TxnId txnId;

    SegStreamPosition logPosition;

    bool longLog;

    uint cbActionLast;

    uint nParticipants;
};

struct FENNEL_TXN_EXPORT LogicalTxnActionHeader
{
    LogicalTxnParticipant *pParticipant;

    LogicalActionType actionType;

    uint cbActionPrev;
};

struct FENNEL_TXN_EXPORT LogicalTxnLogCheckpointMemento
{
    SegStreamPosition logPosition;

    uint nUncommittedTxns;

    TxnId nextTxnId;
};

static const LogicalActionType ACTION_TXN_DESCRIBE_PARTICIPANT = -1;

static const LogicalActionType ACTION_TXN_ROLLBACK_TO_SAVEPOINT = -2;

FENNEL_END_NAMESPACE

#endif

// End LogicalTxnStoredStructs.h

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