PCTwoLevelsBlockDiagonal.hpp

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*/

#ifndef PCTWOLEVELSBLOCKDIAGONAL_HPP_
#define PCTWOLEVELSBLOCKDIAGONAL_HPP_

#include <cassert>
#include <petscvec.h>
#include <petscmat.h>
#include <petscksp.h>
#include <petscpc.h>
#include "PetscTools.hpp"

#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 1) //PETSc 3.1 or later
PetscErrorCode PCTwoLevelsBlockDiagonalApply(PC pc_context, Vec x, Vec y);
#else
PetscErrorCode PCTwoLevelsBlockDiagonalApply(void* pc_context, Vec x, Vec y);
#endif


class PCTwoLevelsBlockDiagonal
{
public:

    typedef struct{
        Mat A11_matrix_subblock; 
        Mat A22_B1_matrix_subblock; 
        Mat A22_B2_matrix_subblock; 
        PC  PC_amg_A11; 
        PC  PC_amg_A22_B1; 
        PC  PC_amg_A22_B2; 
        Vec x1_subvector;
        Vec x21_subvector;
        Vec x22_subvector;
        Vec y1_subvector;
        Vec y21_subvector;
        Vec y22_subvector;
        VecScatter A11_scatter_ctx;
        VecScatter A22_B1_scatter_ctx;
        VecScatter A22_B2_scatter_ctx;
    } PCTwoLevelsBlockDiagonalContext;

    PCTwoLevelsBlockDiagonalContext mPCContext; 
    PC mPetscPCObject;
public:

    PCTwoLevelsBlockDiagonal(KSP& rKspObject, std::vector<PetscInt>& rBathNodes);

    ~PCTwoLevelsBlockDiagonal();

private:

    void PCTwoLevelsBlockDiagonalCreate(KSP& rKspObject, std::vector<PetscInt>& rBathNodes);

    void PCTwoLevelsBlockDiagonalSetUp();
};

#endif /*PCTWOLEVELSBLOCKDIAGONAL_HPP_*/