RandomAllocationSegment.h

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/*
// $Id: //open/dev/fennel/segment/RandomAllocationSegment.h#12 $
// 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_RandomAllocationSegment_Included
#define Fennel_RandomAllocationSegment_Included

#include "fennel/segment/RandomAllocationSegmentBase.h"

FENNEL_BEGIN_NAMESPACE

struct ExtentAllocationNode;

class FENNEL_SEGMENT_EXPORT RandomAllocationSegment
    : public RandomAllocationSegmentBase
{
    // implement RandomAllocationSegmentBase
    virtual PageId getSegAllocPageIdForWrite(PageId origSegAllocPageId);
    virtual void undoSegAllocPageWrite(PageId segAllocPageId);
    virtual PageId getExtAllocPageIdForWrite(ExtentNum extentNum);
    virtual PageId allocateFromExtent(ExtentNum extentNum, PageOwnerId ownerId);
    virtual void formatPageExtents(
        SegmentAllocationNode &segAllocNode,
        ExtentNum &extentNum);
    virtual PageId allocateFromNewExtent(
        ExtentNum extentNum,
        PageOwnerId ownerId);
    virtual void freePageEntry(ExtentNum extentNum, BlockNum iPageInExtent);
    virtual PageOwnerId getPageOwnerId(PageId pageId, bool thisSegment);
    virtual PageId getSegAllocPageIdForRead(
        PageId origSegAllocPageId,
        SharedSegment &allocNodeSegment);
    virtual PageId getExtAllocPageIdForRead(
        ExtentNum extentNum,
        SharedSegment &allocNodeSegment);
    virtual void getPageEntryCopy(
        PageId pageId,
        PageEntry &pageEntryCopy,
        bool isAllocated,
        bool thisSegment);

public:
    explicit RandomAllocationSegment(SharedSegment delegateSegment);

    // implementation of Segment interface
    virtual PageId allocatePageId(PageOwnerId ownerId);
    virtual PageId getPageSuccessor(PageId pageId);
    virtual void setPageSuccessor(PageId pageId, PageId successorId);
};

FENNEL_END_NAMESPACE

#endif

// End RandomAllocationSegment.h

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