LogicalTxnLog.h

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/*
// $Id: //open/dev/fennel/txn/LogicalTxnLog.h#14 $
// 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_LogicalTxnLog_Included
#define Fennel_LogicalTxnLog_Included

#include <vector>
#include <boost/utility.hpp>
#include <boost/enable_shared_from_this.hpp>
#include "fennel/synch/SynchMonitoredObject.h"
#include "fennel/txn/LogicalTxnStoredStructs.h"
#include "fennel/common/PseudoUuid.h"

FENNEL_BEGIN_NAMESPACE

class FENNEL_TXN_EXPORT LogicalTxnLog
    : public boost::noncopyable,
        public boost::enable_shared_from_this<LogicalTxnLog>,
        public SynchMonitoredObject
{
    friend class LogicalTxn;

    typedef std::vector<SharedLogicalTxn> TxnList;
    typedef std::vector<SharedLogicalTxn>::iterator TxnListIter;

    typedef std::vector<SharedSegment> SegList;
    typedef std::vector<SharedSegment>::iterator SegListIter;

    SharedSegmentFactory pSegmentFactory;

    TxnId nextTxnId;

    TxnList uncommittedTxns;

    SegList committedLongLogSegments;

    SegmentAccessor logSegmentAccessor;

    SharedSegOutputStream pOutputStream;

    LogicalTxnLogCheckpointMemento lastCheckpointMemento;

    uint nCommittedBeforeLastCheckpoint;

    uint groupCommitInterval;

    explicit LogicalTxnLog(
        SegmentAccessor const &logSegmentAccessor,
        PseudoUuid const &onlineUuid,
        SharedSegmentFactory pSegmentFactory);

    void removeTxn(SharedLogicalTxn pTxn);

    void commitTxn(SharedLogicalTxn pTxn);

    void rollbackTxn(SharedLogicalTxn pTxn);

    void checkpointTxn(SharedLogicalTxn pTxn);

    void commitTxnWithGroup(StrictMutexGuard &mutexGuard);

public:

    static SharedLogicalTxnLog newLogicalTxnLog(
        SegmentAccessor const &logSegmentAccessor,
        PseudoUuid const &onlineUuid,
        SharedSegmentFactory pSegmentFactory);

    virtual ~LogicalTxnLog();

    void setNextTxnId(TxnId nextTxnIdInit);

    SharedLogicalTxn newLogicalTxn(
        SharedCacheAccessor pCacheAccessor);

    void checkpoint(
        LogicalTxnLogCheckpointMemento &memento,
        CheckpointType checkpointType = CHECKPOINT_FLUSH_ALL);

    void deallocateCheckpointedLog(
        LogicalTxnLogCheckpointMemento const &memento,
        CheckpointType checkpointType = CHECKPOINT_FLUSH_ALL);

    TxnId getOldestActiveTxnId();
};

FENNEL_END_NAMESPACE

#endif

// End LogicalTxnLog.h

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