PetscTools.hpp

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*/

#ifndef PETSCTOOLS_HPP_
#define PETSCTOOLS_HPP_

#include <string>
#include <vector>
#include <cstdlib> // For EXIT_FAILURE

#include <petsc.h>
#include <petscvec.h>
#include <petscmat.h>

#define EXIT_IF_PARALLEL if(PetscTools::IsParallel()){TS_TRACE("This test does not pass in parallel yet.");return;}

#define EXIT_IF_SEQUENTIAL if(PetscTools::IsSequential()){TS_TRACE("This test is not meant to be executed in sequential.");return;}

#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR < 2 || PETSC_VERSION_MAJOR<3 ) // Before PETSc 3.2

typedef PetscTruth PetscBool;
#define PETSC_DESTROY_PARAM(x) x
#else

#define PETSC_DESTROY_PARAM(x) &x
#endif

#define TRY_IF_MASTER(method) {              \
    if (PetscTools::AmMaster())              \
    { try {                                  \
        method;                              \
    } catch (Exception& e) {                 \
        PetscTools::ReplicateException(true);\
        throw(e);                            \
    } }                                      \
    PetscTools::ReplicateException(false);   \
    }

class PetscTools
{
private:

    static bool mPetscIsInitialised;

    static unsigned mNumProcessors;

    static unsigned mRank;

    static bool mIsolateProcesses;

    static inline void CheckCache()
    {
        if (mNumProcessors == 0)
        {
            ResetCache();
        }
    }

public:

    static const unsigned MASTER_RANK=0;

    static void ResetCache();

    static bool IsInitialised();

    static bool IsSequential();

    static bool IsParallel();

    static bool IsIsolated();

    static unsigned GetNumProcs();

    static unsigned GetMyRank();

    static bool AmMaster();

    static bool AmTopMost();

    static void Barrier(const std::string callerId="");

    static void BeginRoundRobin();

    static void EndRoundRobin();

    static void IsolateProcesses(bool isolate=true);

    static MPI_Comm GetWorld();

    static Vec CreateVec(int size, int localSize=PETSC_DECIDE, bool ignoreOffProcEntries = true);

    static Vec CreateVec(std::vector<double> data);

    static Vec CreateAndSetVec(int size, double value);

    static void SetupMat(Mat& rMat, int numRows, int numColumns,
                         unsigned rowPreallocation,
                         int numLocalRows=PETSC_DECIDE,
                         int numLocalColumns=PETSC_DECIDE,
                         bool ignoreOffProcEntries=true,
                         bool newAllocationError=true);

    static bool ReplicateBool(bool flag);

    static void ReplicateException(bool flag);

    static void DumpPetscObject(const Mat& rMat, const std::string& rOutputFileFullPath);

    static void DumpPetscObject(const Vec& rVec, const std::string& rOutputFileFullPath);

    static void ReadPetscObject(Mat& rMat, const std::string& rOutputFileFullPath, Vec rParallelLayout=NULL);

    static void ReadPetscObject(Vec& rVec, const std::string& rOutputFileFullPath, Vec rParallelLayout=NULL);

    static bool HasParMetis();

     static inline void Destroy(Vec& rVec)
     {
#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 2) //PETSc 3.2 or later
        VecDestroy(&rVec);
#else
        VecDestroy(rVec);
#endif
     }

     static inline void Destroy(Mat& rMat)
     {
#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 2) //PETSc 3.2 or later
        MatDestroy(&rMat);
#else
        MatDestroy(rMat);
#endif
     }
};

#endif /*PETSCTOOLS_HPP_*/