multiWorldConnectionsObject.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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-------------------------------------------------------------------------------
    Copyright (C) 2021 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM 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 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM 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 OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::multiWorldConnections
 
Description
    Centralized handling of multi-world MPI connections.
 
Note
    This class may move to static only or a singleton in the future.
 
SourceFiles
    multiWorldConnectionsObject.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef meshObjects_multiWorldConnections_H
#define meshObjects_multiWorldConnections_H
 
#include "MeshObject.H"
#include "edgeHashes.H"
#include "Time.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                    Class multiWorldConnections Declaration
\*---------------------------------------------------------------------------*/
 
class multiWorldConnections
:
    public MeshObject
    <
        Time,
        TopologicalMeshObject,
        multiWorldConnections
    >
{
    // Private Typedefs
 
        typedef MeshObject
        <
            Time,
            TopologicalMeshObject,
            multiWorldConnections
        > MeshObject_type;
 
 
    // Private Data
 
        //- Table of world/world connections to communicator label
        EdgeMap<label> table_;
 
 
    // Private Member Functions
 
        //- Pairing from myWorld to other world by ID
        //  \return invalid on any error or if non-parallel
        static edge worldPair(const label otherWorld);
 
        //- Pairing from myWorld to other world by NAME.
        //  \return invalid on any error or if non-parallel
        static edge worldPair(const word& otherWorld);
 
        //- Allocate a communicator between myWorld and other world
        static label createCommunicator(const edge& worlds);
 
 
public:
 
    //- Run-time type information
    TypeName("multiWorld");
 
 
    // Constructors
 
        //- Construct
        explicit multiWorldConnections(const Time& runTime);
 
 
    // Selectors
 
        //- Access mesh object
        static const multiWorldConnections& New(const Time& runTime);
 
 
    //- Destructor
    ~multiWorldConnections() = default;
 
 
    // Member Functions
 
        //- True if no world-to-world connections are defined
        bool empty() const noexcept;
 
        //- Number of world-to-world connections defined.
        label size() const noexcept;
 
        //- Create all communicators.
        //- Low-level, not normally called directly
        void createComms();
 
        //- Define a connection from myWorld to other world by ID
        bool addConnectionById(const label otherWorld);
 
        //- Define a connection from myWorld to other world by NAME
        bool addConnectionByName(const word& otherWorld);
 
        //- Get communicator for myWorld to other world connection by ID.
        //  Uses cached value, or creates a new communicator
        label getCommById(const label otherWorld) const;
 
        //- Get communicator for myWorld to other world connection by NAME.
        //  Uses cached value, or creates a new communicator
        label getCommByName(const word& otherWorld) const;
 
        //- Get communicators used for myWorld to other worlds in sorted order.
        //  \return worldComm if no world-to-world communicators in use.
        labelList comms() const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //