LinearDeviceSegment.h

Go to the documentation of this file.

/*
// $Id: //open/dev/fennel/segment/LinearDeviceSegment.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_LinearDeviceSegment_Included
#define Fennel_LinearDeviceSegment_Included

#include "fennel/segment/Segment.h"
#include <vector>

FENNEL_BEGIN_NAMESPACE

struct FENNEL_SEGMENT_EXPORT LinearDeviceSegmentParams
{
    BlockId firstBlockId;

    BlockNum nPagesMin;

    BlockNum nPagesAllocated;

    BlockNum nPagesIncrement;

    BlockNum nPagesMax;

    explicit LinearDeviceSegmentParams();
};

class FENNEL_SEGMENT_EXPORT LinearDeviceSegment
    : public Segment
{
    friend class SegmentFactory;

    SharedRandomAccessDevice pDevice;
    BlockId firstBlockId;
    BlockNum nPagesMax,nPagesAllocated,nPagesIncrement,nPagesExtended;

    explicit LinearDeviceSegment(
        SharedCache cache,
        LinearDeviceSegmentParams const &);

    BlockNum getAvailableDevicePages() const;

public:
    virtual ~LinearDeviceSegment();

    DeviceId getDeviceId() const;

    // implementation of Segment interface

    virtual BlockId translatePageId(PageId);
    virtual PageId translateBlockId(BlockId);
    virtual PageId allocatePageId(PageOwnerId ownerId);
    virtual void deallocatePageRange(PageId startPageId,PageId endPageId);
    virtual bool isPageIdAllocated(PageId pageId);
    virtual BlockNum getAllocatedSizeInPages();
    virtual BlockNum getNumPagesOccupiedHighWater();
    virtual BlockNum getNumPagesExtended();
    virtual PageId getPageSuccessor(PageId pageId);
    virtual void setPageSuccessor(PageId pageId, PageId successorId);
    virtual AllocationOrder getAllocationOrder() const;
    virtual bool ensureAllocatedSize(BlockNum nPages);
    virtual void delegatedCheckpoint(
        Segment &delegatingSegment,
        CheckpointType checkpointType);
};

FENNEL_END_NAMESPACE

#endif

// End LinearDeviceSegment.h

---