CrcSegInputStream.h

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/*
// $Id: //open/dev/fennel/segment/CrcSegInputStream.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_CrcSegInputStream_Included
#define Fennel_CrcSegInputStream_Included

#include "fennel/segment/SegInputStream.h"

#include <boost/crc.hpp>

FENNEL_BEGIN_NAMESPACE

class FENNEL_SEGMENT_EXPORT CrcSegInputStream
    : public SegInputStream
{
    PseudoUuid onlineUuid;

    // TODO:  use a 64-bit crc instead
    boost::crc_32_type crcComputer;

    explicit CrcSegInputStream(
        SegmentAccessor const &segmentAccessor,
        PseudoUuid onlineUuid,
        PageId beginPageId);

    inline bool lockBufferParanoid();

    virtual void lockBuffer();

public:
    static SharedSegInputStream newCrcSegInputStream(
        SegmentAccessor const &segmentAccessor,
        PseudoUuid onlineUuid,
        PageId beginPageId = FIRST_LINEAR_PAGE_ID);
};

FENNEL_END_NAMESPACE

#endif

// End CrcSegInputStream.h

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