randomDecomp.H

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License
    This file is part of OpenFOAM.

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Class
    Foam::randomDecomp

Description
    Decomposition according to pseudo-random number generator,
    which is useful for development and stress testing implementations
    but obviously sub-optimal for normal uses.
    Can optionally specify the number of consecutive cells to assign
    to the same processor (agglomeration).

    Coefficients:
    \table
        Property  | Description                             | Required | Default
        agglom    | Number of cells to agglomerate          | no  | 1
    \endtable

SourceFiles
    randomDecomp.C

\*---------------------------------------------------------------------------*/

#ifndef Foam_randomDecomp_H
#define Foam_randomDecomp_H

#include "decompositionMethod.H"

namespace Foam
{

/*---------------------------------------------------------------------------*\
                        Class randomDecomp Declaration
\*---------------------------------------------------------------------------*/

class randomDecomp
:
    public decompositionMethod
{
    // Private Data

        //- Number of cells to agglomerate per random value (default: 1)
        label agglom_;


    // Private Member Functions

        //- Random distribution on the 0-nCells interval
        labelList randomMap(const label nCells) const;

        //- No copy construct
        void operator=(const randomDecomp&) = delete;

        //- No copy assignment
        randomDecomp(const randomDecomp&) = delete;


public:

    //- Runtime type information
    TypeNameNoDebug("random");


    // Constructors

        //- Construct for decomposition dictionary and optional region name
        explicit randomDecomp
        (
            const dictionary& decompDict,
            const word& regionName = "",
            int select = selectionType::DEFAULT
        );


    //- Destructor
    virtual ~randomDecomp() = default;


    // Member Functions

        //- Does not care about proc boundaries
        virtual bool parallelAware() const
        {
            return true;
        }


    // No topology (implemented by geometric decomposers)

        //- Return for every coordinate the wanted processor number.
        virtual labelList decompose
        (
            const pointField& points,
            const scalarField& pointWeights
        ) const;

        //- Decompose with uniform weights on the points
        virtual labelList decompose(const pointField& points) const;

        //- Return for every coordinate the wanted processor number.
        virtual labelList decompose
        (
            const polyMesh& mesh,
            const pointField& cc,
            const scalarField& cWeights
        ) const;

        //- Return for every coordinate the wanted processor number.
        //  Explicitly provided connectivity - does not use mesh_.
        virtual labelList decompose
        (
            const labelListList& globalCellCells,
            const pointField& cc,
            const scalarField& cWeights
        ) const;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //