RandomAccessRequest.h

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/*
// $Id: //open/dev/fennel/device/RandomAccessRequest.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_RandomAccessRequest_Included
#define Fennel_RandomAccessRequest_Included

#include "fennel/common/IntrusiveList.h"

#ifdef HAVE_AIO_H
#include <aio.h>
struct aiocb;
#endif

#ifdef HAVE_LIBAIO_H
#include <libaio.h>
struct iocb;
#endif

#ifdef __MSVC__
#include <windows.h>
#endif

FENNEL_BEGIN_NAMESPACE

class RandomAccessDevice;

class FENNEL_DEVICE_EXPORT RandomAccessRequestBinding
    : public IntrusiveListNode
#ifdef USE_AIO_H
, public aiocb
#endif
#ifdef USE_LIBAIO_H
, public iocb
#endif
#ifdef __MSVC__
, public OVERLAPPED
#endif
{
public:
    explicit RandomAccessRequestBinding();
    virtual ~RandomAccessRequestBinding();

    virtual PBuffer getBuffer() const = 0;

    virtual uint getBufferSize() const = 0;

    virtual void notifyTransferCompletion(bool bSuccess) = 0;
};

class FENNEL_DEVICE_EXPORT RandomAccessRequest
{
public:
    enum Type {
        READ,
        WRITE
    };

    typedef IntrusiveList<RandomAccessRequestBinding> BindingList;
    typedef IntrusiveListIter<RandomAccessRequestBinding> BindingListIter;
    typedef IntrusiveListMutator<RandomAccessRequestBinding>
    BindingListMutator;

    RandomAccessDevice *pDevice;

    FileSize cbOffset;

    FileSize cbTransfer;

    Type type;

    BindingList bindingList;

    void execute();
};

FENNEL_END_NAMESPACE

#endif

// End RandomAccessRequest.h

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