ExecStreamEmbryo.h

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/*
// $Id: //open/dev/fennel/exec/ExecStreamEmbryo.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) 2004-2009 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_ExecStreamEmbryo_Included
#define Fennel_ExecStreamEmbryo_Included

#include <boost/bind.hpp>
#include <boost/function.hpp>

FENNEL_BEGIN_NAMESPACE

class FENNEL_EXEC_EXPORT ExecStreamEmbryo
{
    SharedExecStream pStream;

    SharedExecStreamParams pParams;

    boost::function<void ()> prepareFunction;

public:

    template<class S, class P>
    inline void init(S *pStreamInit, P const &paramsInit)
    {
        pStream.reset(pStreamInit, ClosableObjectDestructor());
        P *pParamCopy = new P(paramsInit);
        pParams.reset(pParamCopy);
        prepareFunction = boost::bind(
            &S::prepare, pStreamInit, boost::ref(*pParamCopy));
    }

    inline SharedExecStream &getStream()
    {
        return pStream;
    }

    inline SharedExecStreamParams &getParams()
    {
        return pParams;
    }

    inline void prepareStream()
    {
        prepareFunction();
    }
};

FENNEL_END_NAMESPACE

#endif

// End ExecStreamEmbryo.h

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