MergeExecStream.h

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/*
// $Id: //open/dev/fennel/exec/MergeExecStream.h#8 $
// 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.
//
// 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_MergeExecStream_Included
#define Fennel_MergeExecStream_Included

#include "fennel/exec/ConfluenceExecStream.h"

#include <vector>

FENNEL_BEGIN_NAMESPACE

struct FENNEL_EXEC_EXPORT MergeExecStreamParams
    : public ConfluenceExecStreamParams
{
    bool isParallel;

    explicit MergeExecStreamParams();
};

class FENNEL_EXEC_EXPORT MergeExecStream
    : public ConfluenceExecStream
{
    uint iInput;

    uint nInputsEOS;

    std::vector<bool> inputEOS;

    bool isParallel;

    PConstBuffer pLastConsumptionEnd;

public:
    // implement ExecStream
    virtual void prepare(MergeExecStreamParams const &params);
    virtual void open(bool restart);
    virtual ExecStreamResult execute(ExecStreamQuantum const &quantum);
    virtual ExecStreamBufProvision getOutputBufProvision() const;
};

FENNEL_END_NAMESPACE

#endif

// End MergeExecStream.h

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