JavaTransformExecStream.h

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/*
// $Id: //open/dev/fennel/farrago/JavaTransformExecStream.h#10 $
// Fennel is a library of data storage and processing components.
// Copyright (C) 2006-2009 The Eigenbase Project
// Copyright (C) 2006-2009 SQLstream, Inc.
// Copyright (C) 2006-2009 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_JavaTransformExecStream_Included
#define Fennel_JavaTransformExecStream_Included

#include "fennel/exec/ExecStream.h"
#include "fennel/exec/ExecStreamDefs.h"
#include "fennel/farrago/CmdInterpreter.h"
#include "fennel/segment/SegPageLock.h"
#include "fennel/tuple/TupleData.h"
#include <string>
#include <iostream>

#include <jni.h>

FENNEL_BEGIN_NAMESPACE

struct JavaTransformExecStreamParams :
    virtual public ExecStreamParams
{
    TupleDescriptor outputTupleDesc;
    TupleFormat outputTupleFormat;

    std::string javaClassName;

    CmdInterpreter::StreamGraphHandle *pStreamGraphHandle;

    explicit JavaTransformExecStreamParams();
};


class FENNEL_FARRAGO_EXPORT JavaTransformExecStream
    : virtual public ExecStream
{
    CmdInterpreter::StreamGraphHandle *pStreamGraphHandle;
    std::string javaClassName;
    jobject outputByteBuffer1;
    jobject outputByteBuffer2;
    PBuffer pBuffer1;
    PBuffer pBuffer2;


protected:
    std::vector<SharedExecStreamBufAccessor> inAccessors;
    SharedExecStreamBufAccessor pOutAccessor;

    void checkEmptyInputs();

    jobject farragoTransform;

public:
    JavaTransformExecStream();
    virtual ~JavaTransformExecStream();

    // implement ExecStream
    virtual void prepare(JavaTransformExecStreamParams const &params);
    virtual void setInputBufAccessors(
        std::vector<SharedExecStreamBufAccessor> const &inAccessors);
    virtual void setOutputBufAccessors(
        std::vector<SharedExecStreamBufAccessor> const &outAccessors);
    virtual void open(bool restart);
    virtual ExecStreamResult execute(ExecStreamQuantum const &quantum);
    virtual void closeImpl();
    virtual ExecStreamBufProvision getInputBufProvision() const;
    virtual ExecStreamBufProvision getOutputBufProvision() const;
    virtual ExecStreamBufProvision getOutputBufConversion() const;
};

FENNEL_END_NAMESPACE

#endif

// End JavaTransformExecStream.h

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