processorTopology.H

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    Copyright (C) 2022 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
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    the Free Software Foundation, either version 3 of the License, or
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    You should have received a copy of the GNU General Public License
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Class
    Foam::processorTopology
 
Description
    Determines/represents processor-processor connection.
    After instantiation contains the processor-processor connection table
    (globally synchronized on all processors).
 
Note
    A processorTopology is usually generated by using the \c New
    factory method, which has been wrapped into a separate header to
    minimize dependencies.
 
Warning
    Does not currently correctly support multiple processor
    patches connecting two processors.
 
SourceFiles
    processorTopologyNew.H
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_processorTopology_H
#define Foam_processorTopology_H
 
#include "labelList.H"
#include "lduSchedule.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                      Class processorTopology Declaration
\*---------------------------------------------------------------------------*/
 
class processorTopology
{
    // Private Data
 
        //- The processor to processor connection (adjacency) table
        labelListList procNeighbours_;
 
        //- Order in which the patches should be initialised/evaluated
        //- corresponding to the schedule
        lduSchedule patchSchedule_;
 
        //- Local map from neighbour proc to patchi. Different per processor!
        //  -1 or patchi for connection to procID
        labelList procPatchMap_;
 
 
    // Private Member Functions
 
        //- From neighbour processor to index in our local boundary.
        //  Local information (so not same over all processors)
 
        //- Which \em local boundary is attached to specified processor
        //  Local information (so not same over all processors)
        //  \return -1 if not currently connected to specified processor.
        label procToLocalPatch(const label proci) const
        {
            return
            (
                proci >= 0 && proci < procPatchMap_.size()
              ? procPatchMap_[proci]
              : static_cast<label>(-1)
            );
        }
 
 
public:
 
    // Generated Methods
 
        //- Default construct (empty)
        processorTopology() = default;
 
        //- Copy construct
        processorTopology(const processorTopology&) = default;
 
        //- Move construct
        processorTopology(processorTopology&&) = default;
 
        //- Copy assignment
        processorTopology& operator=(const processorTopology&) = default;
 
        //- Move assignment
        processorTopology& operator=(processorTopology&&) = default;
 
 
    // Static Functions
 
        //- Factory method to create topology, schedule and proc/patch maps.
        //  Scans the list of patches for processor connections corresponding
        //  to the ProcPatch type.
        template<class ProcPatch, class PatchListType>
        static processorTopology New
        (
            const PatchListType& patches,
            const label comm
        );
 
 
    // Member Functions
 
        //- The number of processors used by the topology
        label nProcs() const noexcept
        {
            return procNeighbours_.size();
        }
 
        //- The processor to processor connection topology
        //- (like an adjacency list). Globally synchronized information
        const labelListList& procNeighbours() const noexcept
        {
            return procNeighbours_;
        }
 
        //- Order in which the patches should be initialised/evaluated
        //- corresponding to the schedule
        const lduSchedule& patchSchedule() const noexcept
        {
            return patchSchedule_;
        }
 
        //- Which \em local boundary is attached to specified processor
        //  Local information (so not same over all processors)
        //  \return -1 if not currently connected to specified processor.
        label procPatchLookup(const label proci) const
        {
            return procToLocalPatch(proci);
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //