DistributedVector.hpp

/*

Copyright (C) University of Oxford, 2005-2009

University of Oxford means the Chancellor, Masters and Scholars of the
University of Oxford, having an administrative office at Wellington
Square, Oxford OX1 2JD, UK.

This file is part of Chaste.

Chaste is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 2.1 of the License, or
(at your option) any later version.

Chaste 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 Lesser General Public
License for more details. The offer of Chaste under the terms of the
License is subject to the License being interpreted in accordance with
English Law and subject to any action against the University of Oxford
being under the jurisdiction of the English Courts.

You should have received a copy of the GNU Lesser General Public License
along with Chaste. If not, see <http://www.gnu.org/licenses/>.

*/


#ifndef DISTRIBUTEDVECTOR_HPP_
#define DISTRIBUTEDVECTOR_HPP_

#include <vector>
#include <petscvec.h>
#include <iostream>
#include <cassert>
#include "DistributedVectorException.hpp"

class DistributedVector
{
private:
    // Data global to all vectors.
    static unsigned mLo;
    static unsigned mHi;
    static unsigned mGlobalHi;
    static bool mPetscStatusKnown;

    // Data local to a single vector.
    unsigned mNumChunks;
    Vec mVec;
    double *mpVec;

    static void CheckForPetsc();

public:

    static void SetProblemSizePerProcessor(unsigned size, PetscInt local);

    static void SetProblemSize(unsigned size);

    static void SetProblemSize(Vec vec);

    static unsigned GetProblemSize();

    static bool IsGlobalIndexLocal(unsigned globalIndex);

    static Vec CreateVec();

    static Vec CreateVec(unsigned stride);

    DistributedVector(Vec vec);

    double& operator[](unsigned globalIndex) throw (DistributedVectorException);

    void Restore();

    class Iterator
    {
    public:
        unsigned Local;  
        unsigned Global; 
        bool operator!=(const Iterator& other);

        Iterator& operator++();
    };

    class Stripe
    {
    public:
        unsigned mStride;
        unsigned mStripe;
        double *mpVec;

        Stripe(DistributedVector parallelVec, unsigned stripe)
        {
            mStride = parallelVec.mNumChunks;
            mStripe = stripe;
            assert(mStripe < mStride);
            mpVec = parallelVec.mpVec;
        }

        double& operator[](unsigned globalIndex) throw (DistributedVectorException)
        {
            if (mLo<=globalIndex && globalIndex <mHi)
            {
                return mpVec[(globalIndex - mLo)*mStride + mStripe];
            }
            throw DistributedVectorException();
        }

        double& operator[](Iterator index) throw (DistributedVectorException)
        {
            return mpVec[index.Local*mStride+mStripe];
        }

    };

    class Chunk
    {
    public:
        //unsigned mChunk;
        unsigned mOffset;  
        double *mpVec;

        Chunk(DistributedVector parallelVec, unsigned chunk)
        {
            assert(chunk<parallelVec.mNumChunks);
            mOffset = chunk*(parallelVec.mHi - parallelVec.mLo);
            mpVec = parallelVec.mpVec;
        }

        double& operator[](unsigned globalIndex) throw (DistributedVectorException)
        {
            if (mLo<=globalIndex && globalIndex <mHi)
            {
                //localIndex = globalIndex - mLo
                return mpVec[mOffset + globalIndex - mLo];
            }
            throw DistributedVectorException();
         }

        double& operator[](Iterator index) throw (DistributedVectorException)
        {
            return mpVec[mOffset + index.Local];
        }

    };

    static Iterator Begin();

    static Iterator End();

    double& operator[](Iterator index) throw (DistributedVectorException);
};



#endif /*DISTRIBUTEDVECTOR_HPP_*/

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