GhostLayerBuilder.h

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2026 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
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/* GhostLayerBuilder.h                                         (C) 2000-2026 */
/*                                                                           */
/* Construction of ghost layers.                                             */
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#ifndef ARCANE_MESH_GHOSTLAYERBUILDER_H
#define ARCANE_MESH_GHOSTLAYERBUILDER_H
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#include "arcane/mesh/DynamicMeshKindInfos.h"
#include "arcane/utils/TraceAccessor.h"
 
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namespace Arcane
{
class SerializeBuffer;
}
 
namespace Arcane::mesh
{
class DynamicMesh;
 
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class GhostLayerBuilder
: public TraceAccessor
{
 public:
 
  typedef DynamicMeshKindInfos::ItemInternalMap ItemInternalMap;
 
  typedef HashTableMapT<Int32, SharedArray<Int64>> BoundaryInfosMap;
  typedef HashTableMapEnumeratorT<Int32, SharedArray<Int64>> BoundaryInfosMapEnumerator;
 
 public:

  explicit GhostLayerBuilder(IMesh* mesh);
  virtual ~GhostLayerBuilder();
 
 public:
 
  void addGhostLayers(bool is_allocate);

  void addGhostChildFromParent();
  void addGhostChildFromParent2(Array<Int64>& ghost_cell_to_refine);
 
 private:
 
  IMesh* m_mesh = nullptr;
  IMeshInternal* m_mesh_internal = nullptr;
 
 private:
 
  void _addOneGhostLayerV2();
  void _exchangeData(IParallelExchanger* exchanger, BoundaryInfosMap& boundary_infos_to_send);
  void _printItem(ItemInternal* ii, std::ostream& o);
  void _exchangeCells(HashTableMapT<Int32, SharedArray<Int32>>& cells_to_send, bool with_flags);
};
 
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//TBD to be defined elsewhere
class NodeUidToSubDomain
{
 public:
 
  NodeUidToSubDomain(Int64 max_uid, Int32 nb_rank);
 
  Int32 uidToRank(Int64 uid)
  {
    Int32 rank = (Int32)(uid / m_nb_by_rank);
    if (rank >= m_nb_rank)
      --rank;
    Int32 nrank = rank % m_modulo;
    return nrank;
  }
  Int32 modulo() const { return m_modulo; }
 
 private:
 
  Int32 m_nb_rank;
  Int32 m_modulo;
  Int64 m_nb_by_rank;
};
 
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} // End namespace Arcane::mesh
 
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#endif