Variable.cc

// -*- 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
//-----------------------------------------------------------------------------
/*---------------------------------------------------------------------------*/
/* Variable.cc                                                 (C) 2000-2026 */
/*                                                                           */
/* Classe gérant une variable.                                                */
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
#ifndef ARCANE_VARIABLE_CC
#define ARCANE_VARIABLE_CC
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
#include "arcane/utils/List.h"
#include "arcane/utils/FatalErrorException.h"
#include "arcane/utils/OStringStream.h"
#include "arcane/utils/Iterator.h"
#include "arcane/utils/Iostream.h"
#include "arcane/utils/String.h"
#include "arcane/utils/ITraceMng.h"
#include "arcane/utils/PlatformUtils.h"
#include "arcane/utils/IStackTraceService.h"
#include "arcane/utils/MemoryAccessInfo.h"
#include "arcane/utils/NotImplementedException.h"
#include "arcane/utils/ScopedPtr.h"
#include "arcane/utils/StringBuilder.h"
#include "arcane/utils/MemoryView.h"
#include "arcane/utils/Convert.h"
 
#include "arcane/core/ItemGroupObserver.h"
#include "arcane/core/Variable.h"
#include "arcane/core/VarRefEnumerator.h"
#include "arcane/core/IVariableAccessor.h"
#include "arcane/core/ItemGroup.h"
#include "arcane/core/IMesh.h"
#include "arcane/core/IItemFamily.h"
#include "arcane/core/ISubDomain.h"
#include "arcane/core/VariableInfo.h"
#include "arcane/core/ISerializer.h"
#include "arcane/core/VariableBuildInfo.h"
#include "arcane/core/VariableComputeFunction.h"
#include "arcane/core/CommonVariables.h"
#include "arcane/core/Observable.h"
#include "arcane/core/IVariableMng.h"
#include "arcane/core/IDataReader.h"
#include "arcane/core/IDataWriter.h"
#include "arcane/core/IParallelMng.h"
#include "arcane/core/VariableDependInfo.h"
#include "arcane/core/IParallelReplication.h"
#include "arcane/core/VariableMetaData.h"
#include "arcane/core/IMeshMng.h"
#include "arcane/core/MeshHandle.h"
#include "arcane/core/VariableComparer.h"
#include "arcane/core/datatype/DataAllocationInfo.h"
#include "arcane/core/internal/IItemFamilyInternal.h"
#include "arcane/core/internal/IVariableMngInternal.h"
#include "arcane/core/internal/IVariableInternal.h"
#include "arcane/core/internal/IDataInternal.h"
#include "arcane/core/internal/IParallelMngInternal.h"
 
#include <map>
#include <set>
#include <atomic>
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
namespace Arcane
{
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
const char* IVariable::TAG_POST_PROCESSING = "PostProcessing";
const char* IVariable::TAG_POST_PROCESSING_AT_THIS_ITERATION = "PostProcessingAtThisIteration";
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
/*
 * \brief Partie privée d'une variable.
 */
class VariablePrivate
: public IVariableInternal
{
 public:
 
  VariablePrivate(const VariableBuildInfo& v, const VariableInfo& vi, Variable* var);
 
 public:
 
  static std::atomic<Int64> modified_time_global_value;
 
 public:
 
  ISubDomain* m_sub_domain = nullptr;
  IDataFactoryMng* m_data_factory_mng = nullptr;
  MeshHandle m_mesh_handle; 
  Ref<IData> m_data; 
  ItemGroup m_item_group; 
  IItemFamily* m_item_family = nullptr; 
  VariableInfo m_infos; 
  int m_property = 0; 
  bool m_is_partial = false; 
  bool m_need_property_update = false;
  bool m_is_used = false; 
  bool m_has_valid_data = false; 
  Real m_last_update_time = 0.0; 
  VariableRef* m_first_reference = nullptr; 
  Integer m_nb_reference = 0;
  UniqueArray<VariableDependInfo> m_depends; 
  Int64 m_modified_time = 0; 
  ScopedPtrT<IVariableComputeFunction> m_compute_function; 
  AutoDetachObservable m_write_observable; 
  AutoDetachObservable m_read_observable; 
  AutoDetachObservable m_on_size_changed_observable; 
  std::map<String, String> m_tags; 
  bool m_has_recursive_depend = true; 
  bool m_want_shrink = false;
  Variable* m_variable = nullptr; 
 
 public:

  void serializeHashId(ISerializer* sbuf)
  {
    switch (sbuf->mode()) {
    case ISerializer::ModeReserve:
      sbuf->reserveSpan(eBasicDataType::Byte, HASHID_SIZE);
      break;
    case ISerializer::ModePut:
      sbuf->putSpan(Span<const Byte>(m_hash_id, HASHID_SIZE));
      break;
    case ISerializer::ModeGet: {
      Byte read_hash_id_buf[HASHID_SIZE];
      Span<Byte> read_span(read_hash_id_buf, HASHID_SIZE);
      sbuf->getSpan(read_span);
      Span<const Byte> ref_span(m_hash_id, HASHID_SIZE);
      if (ref_span != Span<const Byte>(read_span))
        ARCANE_FATAL("Bad hashid for variable name='{0}'\n"
                     "  expected_hash_id='{1}'\n"
                     "  hash_id         ='{2}'\n"
                     " This may be due to incoherence in variable list (order) between ranks"
                     " during serialization",
                     m_infos.fullName(), String(ref_span), String(read_span));
    } break;
    }
  }
 
 public:

  String computeComparisonHashCollective(IHashAlgorithm* hash_algo, IData* sorted_data) override;
  void changeAllocator(const MemoryAllocationOptions& alloc_info) override;
  void resize(const VariableResizeArgs& resize_args) override;
  VariableComparerResults compareVariable(const VariableComparerArgs& compare_args) override;
  IParallelMng* replicaParallelMng() const;
 
 private:
 
  static const int HASHID_SIZE = 64;
  Byte m_hash_id[HASHID_SIZE];
 
  void _setHashId()
  {
    constexpr Int64 hashid_hexa_length = 16;
    constexpr Int64 name_length = HASHID_SIZE - hashid_hexa_length;
    Span<Byte> hash_id(m_hash_id, HASHID_SIZE);
    hash_id.fill('~');
    const String& full_name = m_infos.fullName();
    Int64 hash_value = IntegerHashFunctionT<StringView>::hashfunc(full_name.view());
    Convert::toHexaString(hash_value, hash_id);
    Span<const Byte> bytes = full_name.bytes();
    if (bytes.size() > name_length)
      bytes = bytes.subspan(0, name_length);
    auto hash_id2 = hash_id.subspan(hashid_hexa_length, name_length);
    hash_id2.copy(bytes);
  }
};
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
std::atomic<Int64> VariablePrivate::modified_time_global_value = 1;
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Int64 IVariable::
incrementModifiedTime()
{
  Int64 v = VariablePrivate::modified_time_global_value;
  ++VariablePrivate::modified_time_global_value;
  return v;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
VariablePrivate::
VariablePrivate(const VariableBuildInfo& v, const VariableInfo& vi, Variable* var)
: m_sub_domain(v._subDomain())
, m_data_factory_mng(v.dataFactoryMng())
, m_mesh_handle(v.meshHandle())
, m_infos(vi)
, m_property(v.property())
, m_is_partial(vi.isPartial())
, m_variable(var)
{
  _setHashId();
  m_infos.setDefaultItemGroupName();
 
  // Pour test uniquement
  if (!platform::getEnvironmentVariable("ARCANE_NO_RECURSIVE_DEPEND").null())
    m_has_recursive_depend = false;
 
  // Pour teste de libération mémoire.
  {
    String str = platform::getEnvironmentVariable("ARCANE_VARIABLE_SHRINK_MEMORY");
    if (str == "1")
      m_want_shrink = true;
  }
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/

class ItemGroupPartialVariableObserver
: public IItemGroupObserver
{
 public:
 
  explicit ItemGroupPartialVariableObserver(IVariable* var)
  : m_var(var)
  {
    ARCANE_ASSERT((m_var), ("Variable pointer null"));
 
    if (var->itemGroup().isAllItems())
      ARCANE_FATAL("No observer should be attached on all items group");
  }
 
  void executeExtend(const Int32ConstArrayView* info) override
  {
    const Int32ConstArrayView& new_ids = *info;
    if (new_ids.empty())
      return;
    ItemGroup group = m_var->itemGroup();
    SharedPtrT<GroupIndexTable> id_to_index = group.localIdToIndex();
 
    const Integer old_size = id_to_index->size();
    const Integer group_size = group.size();
    if (group_size != (old_size + new_ids.size()))
      ARCANE_FATAL("Inconsistent extended size");
    m_var->resizeFromGroup();
    //id_to_index->update();
  }
 
  void executeReduce(const Int32ConstArrayView* info) override
  {
    // contient la liste des localids des items supprimés dans l'ancien groupe
    const Int32ConstArrayView& removed_lids = *info;
    if (removed_lids.empty())
      return;
    ItemGroup group = m_var->itemGroup();
    SharedPtrT<GroupIndexTable> id_to_index = group.localIdToIndex();
 
    const Integer old_size = id_to_index->size();
    const Integer group_size = group.size();
 
    if (group_size != (old_size - removed_lids.size()))
      ARCANE_FATAL("Inconsistent reduced size {0} vs {1}", group_size, old_size);
    [[maybe_unused]] ItemVectorView view = group.view();
    Int32UniqueArray source;
    Int32UniqueArray destination;
    source.reserve(group_size);
    destination.reserve(group_size);
    for (Integer i = 0, index = 0, removed_index = 0; i < old_size; ++i) {
      if (removed_index < removed_lids.size() &&
          id_to_index->keyLocalId(i) == removed_lids[removed_index]) {
        ++removed_index;
      }
      else {
        ARCANE_ASSERT((id_to_index->keyLocalId(i) == view[index].localId()),
                      ("Inconsistent key (pos=%d,key=%d) vs (pos=%d,key=%d)",
                       i, id_to_index->keyLocalId(i), index, view[index].localId()));
        if (i != index) {
          destination.add(index);
          source.add(i);
        }
        ++index;
      }
    }
    m_var->copyItemsValues(source, destination);
    m_var->resizeFromGroup();
  }
 
  void executeCompact(const Int32ConstArrayView* info) override
  {
    const Int32ConstArrayView& ids = *info;
    if (ids.empty())
      return;
    ItemGroup group = m_var->itemGroup();
    SharedPtrT<GroupIndexTable> id_to_index = group.localIdToIndex();
    m_var->compact(*info);
    //id_to_index->compact(info);
  }
 
  void executeInvalidate() override
  {
    ItemGroup group = m_var->itemGroup();
    SharedPtrT<GroupIndexTable> id_to_index = group.localIdToIndex();
    m_var->resizeFromGroup();
    //id_to_index->update();
  }
 
  bool needInfo() const override { return true; }
 
 private:
 
  IVariable* m_var = nullptr;
};
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Variable::
Variable(const VariableBuildInfo& v, const VariableInfo& vi)
: TraceAccessor(v.traceMng())
, m_p(new VariablePrivate(v, vi, this))
{
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Variable::
~Variable()
{
  //NOTE: si la variable possède un groupe, c'est le IVariableMng
  // qui supprime la référence de cette variable sur le groupe
  delete m_p;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
bool Variable::
_hasReference() const
{
  return m_p->m_first_reference;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
addVariableRef(VariableRef* ref)
{
  _checkSetProperty(ref);
  ++m_p->m_nb_reference;
  ref->setNextReference(m_p->m_first_reference);
  if (m_p->m_first_reference) {
    VariableRef* _list = m_p->m_first_reference;
    if (_list->previousReference())
      _list->previousReference()->setNextReference(ref);
    _list->setPreviousReference(ref);
  }
  else {
    ref->setPreviousReference(0);
  }
  m_p->m_first_reference = ref;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
removeVariableRef(VariableRef* ref)
{
  {
    VariableRef* tmp = ref;
    if (tmp->previousReference())
      tmp->previousReference()->setNextReference(tmp->nextReference());
    if (tmp->nextReference())
      tmp->nextReference()->setPreviousReference(tmp->previousReference());
    if (m_p->m_first_reference == tmp)
      m_p->m_first_reference = m_p->m_first_reference->nextReference();
  }
  // La référence peut être utilisée par la suite donc il ne faut pas oublier
  // de supprimer le précédent et le suivant.
  ref->setNextReference(0);
  ref->setPreviousReference(0);
 
  --m_p->m_nb_reference;
  _checkSetProperty(ref);
 
  // Lorsqu'il n'y a plus de références sur cette variable, le signale au
  // gestionnaire de variable, sauf s'il s'agit d'une variable persistante
  if (!_hasReference()) {
    bool is_persistant = property() & IVariable::PPersistant;
    if (!is_persistant) {
      //m_p->m_trace->info() << " REF PROPERTY name=" << name() << " " << ref->referenceProperty();
      _removeMeshReference();
      ISubDomain* sd = m_p->m_sub_domain;
      IVariableMng* vm = sd->variableMng();
      vm->_internalApi()->removeVariable(this);
    }
  }
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
VariableRef* Variable::
firstReference() const
{
  return m_p->m_first_reference;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
_checkSetProperty(VariableRef* ref)
{
  // Garantie que la propriété est correctement mise à jour avec la valeur
  // de la seule référence.
  if (!_hasReference()) {
    m_p->m_property = ref->referenceProperty();
    m_p->m_need_property_update = false;
  }
  else
    m_p->m_need_property_update = true;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Integer Variable::
nbReference() const
{
  return m_p->m_nb_reference;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
ISubDomain* Variable::
subDomain()
{
  return m_p->m_sub_domain;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
IVariableMng* Variable::
variableMng() const
{
  return m_p->m_sub_domain->variableMng();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
String Variable::
name() const
{
  return m_p->m_infos.localName();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
String Variable::
fullName() const
{
  return m_p->m_infos.fullName();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
String Variable::
itemFamilyName() const
{
  return m_p->m_infos.itemFamilyName();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
String Variable::
itemGroupName() const
{
  return m_p->m_infos.itemGroupName();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
String Variable::
meshName() const
{
  return m_p->m_infos.meshName();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
eDataType Variable::
dataType() const
{
  return m_p->m_infos.dataType();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/

int Variable::
property() const
{
  if (!m_p->m_need_property_update)
    return m_p->m_property;
 
  // Les propriétés de la variable dépendent de ce que chaque
  // référence souhaite et il faut les remettre à jour lorsque ces
  // dernières changent.
  // Par exemple, si toutes les références sont PNoDump et qu'une seule
  // ne l'est pas, la variable ne doit pas l'être.
  m_p->m_need_property_update = false;
 
  bool want_dump = false;
  bool want_sync = false;
  bool want_replica_sync = false;
  bool sub_domain_depend = false;
  bool execution_depend = false;
  bool want_private = false;
  bool want_restore = false;
  bool want_notemporary = false;
  bool want_exchange = false;
  bool want_persistant = false;
  bool want_shmem = false;
  bool want_dumpnull = false;
 
  int property = 0;
  for (VarRefEnumerator i(this); i.hasNext(); ++i) {
    VariableRef* vref = *i;
    int p = vref->referenceProperty();
    if (!(p & IVariable::PNoDump))
      want_dump = true;
    if (!(p & IVariable::PNoNeedSync))
      want_sync = true;
    if (!(p & IVariable::PNoReplicaSync))
      want_replica_sync = true;
    if ((p & IVariable::PSubDomainDepend))
      sub_domain_depend = true;
    if ((p & IVariable::PExecutionDepend))
      execution_depend = true;
    if ((p & IVariable::PPersistant))
      want_persistant = true;
    if ((p & IVariable::PPrivate))
      want_private = true;
    if (!(p & IVariable::PNoRestore))
      want_restore = true;
    if (!(p & IVariable::PNoExchange))
      want_exchange = true;
    if (!(p & IVariable::PTemporary))
      want_notemporary = true;
    if ((p & IVariable::PInShMem))
      want_shmem = true;
    if ((p & IVariable::PDumpNull))
      want_dumpnull = true;
  }
 
  if (!want_dump)
    property |= IVariable::PNoDump;
  if (!want_sync)
    property |= IVariable::PNoNeedSync;
  if (!want_replica_sync)
    property |= IVariable::PNoReplicaSync;
  if (sub_domain_depend)
    property |= IVariable::PSubDomainDepend;
  if (execution_depend)
    property |= IVariable::PExecutionDepend;
  if (want_private)
    property |= IVariable::PPrivate;
  if (want_persistant)
    property |= IVariable::PPersistant;
  if (!want_restore)
    property |= IVariable::PNoRestore;
  if (!want_exchange)
    property |= IVariable::PNoExchange;
  if (!want_notemporary)
    property |= IVariable::PTemporary;
  if (want_shmem)
    property |= IVariable::PInShMem;
  if (want_dumpnull)
    property |= IVariable::PDumpNull;
 
  m_p->m_property = property;
  return m_p->m_property;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
notifyReferencePropertyChanged()
{
  m_p->m_need_property_update = true;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
setUsed(bool is_used)
{
  if (m_p->m_is_used == is_used)
    return;
 
  m_p->m_is_used = is_used;
 
  eItemKind ik = itemKind();
 
  if (m_p->m_is_used) {
    if (m_p->m_property & IVariable::PInShMem) {
      if (m_p->m_property & IVariable::PSubDomainPrivate) {
        ARCANE_FATAL("Variable avec la propriété PInShMem doit être dans tous les sous-domaines (la propriété PSubDomainPrivate ne peut pas être définie avec PInShMem)");
      }
      if (m_p->m_data->_commonInternal()->numericData() == nullptr) {
        ARCANE_FATAL("Variable sans NumericData ne peut pas changer d'allocateur");
      }
      // TODO: Même si changeAllocator() avec le même allocateur déjà en
      //        place fait simplement un return, ça reste moche...
      IParallelMng* pm{};
      if (m_p->m_mesh_handle.hasMesh()) {
        pm = m_p->m_mesh_handle.mesh()->parallelMng();
      }
      else {
        pm = subDomain()->parallelMng();
      }
      m_p->changeAllocator(pm->_internalApi()->machineShMemWinMemoryAllocator());
    }
 
    if (m_p->m_item_group.null() && ik != IK_Unknown) {
      _checkSetItemFamily();
      _checkSetItemGroup();
      // Attention à ne pas reinitialiser les valeurs lorsque ces dernières
      // sont valides, ce qui est le cas par exemple après une protection.
      if (!m_p->m_has_valid_data) {
        resizeFromGroup();
        // Historiquement on remplissait dans tous les cas la variable avec le
        // constructeur par défaut
        // de la donnée en appelant systématiquement fillDefautt(). Cependant,
        // ce n'était pas le comportement souhaité qui doit être celui défini par
        // getGlobalDataInitialisationPolicy() (dans DataTypes.h).
        // On ne le fait maintenant que si le mode d'initialisation est égal
        // à DIP_Legacy. Ce mode doit à terme disparaître.
        if (getGlobalDataInitialisationPolicy() == DIP_Legacy)
          m_p->m_data->fillDefault();
        m_p->m_has_valid_data = true;
      }
    }
  }
  else {
    _removeMeshReference();
    if (ik == IK_Unknown)
      resize(0);
    else
      resizeFromGroup();
    // Indique que les valeurs ne sont plus valides
    m_p->m_has_valid_data = false;
  }
 
  for (VarRefEnumerator i(this); i.hasNext(); ++i) {
    VariableRef* ref = *i;
    ref->internalSetUsed(m_p->m_is_used);
  }
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
_removeMeshReference()
{
  IItemFamily* family = m_p->m_item_family;
  if (family)
    family->_internalApi()->removeVariable(this);
 
  if (isPartial())
    m_p->m_item_group.internal()->detachObserver(this);
 
  m_p->m_item_group = ItemGroup();
  m_p->m_item_family = 0;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
bool Variable::
isUsed() const
{
  return m_p->m_is_used;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
namespace
{
 
  String _buildVariableFullType(const IVariable* var)
  {
    StringBuilder full_type_b;
    full_type_b = dataTypeName(var->dataType());
    full_type_b += ".";
    full_type_b += itemKindName(var->itemKind());
    full_type_b += ".";
    full_type_b += var->dimension();
    full_type_b += ".";
    full_type_b += var->multiTag();
    if (var->isPartial())
      full_type_b += ".Partial";
    return full_type_b.toString();
  }
 
} // namespace
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
VariableMetaData* Variable::
_createMetaData() const
{
  auto vmd = new VariableMetaData(name(), meshName(), itemFamilyName(),
                                  itemGroupName(), isPartial());
  vmd->setFullType(_buildVariableFullType(this));
  vmd->setMultiTag(String::fromNumber(multiTag()));
  vmd->setProperty(property());
  return vmd;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
VariableMetaData* Variable::
createMetaData() const
{
  return _createMetaData();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Ref<VariableMetaData> Variable::
createMetaDataRef() const
{
  return makeRef(_createMetaData());
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
syncReferences()
{
  //cout << "** SYNC REFERENCE N=" << m_p->m_nb_reference << " F=" << m_p->m_first_reference << '\n';
  for (VarRefEnumerator i(this); i.hasNext(); ++i) {
    VariableRef* ref = *i;
    //cout << "** SYNC REFERENCE V=" << ref << '\n';
    ref->updateFromInternal();
  }
  // Il faut le faire après la mise à jour des références
  // car les observateurs peuvent lire les valeurs via une référence
  onSizeChangedObservable()->notifyAllObservers();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Int32 Variable::
checkIfSync(int max_print)
{
  VariableComparerArgs compare_args;
  compare_args.setCompareMode(eVariableComparerCompareMode::Sync);
  compare_args.setMaxPrint(max_print);
  compare_args.setCompareGhost(true);
  VariableComparerResults results = _compareVariable(compare_args);
  return results.nbDifference();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Int32 Variable::
checkIfSameOnAllReplica(Integer max_print)
{
  VariableComparerArgs compare_args;
  compare_args.setCompareMode(eVariableComparerCompareMode::SameOnAllReplica);
  compare_args.setMaxPrint(max_print);
  VariableComparerResults r = _compareVariable(compare_args);
  return r.nbDifference();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Int32 Variable::
checkIfSame(IDataReader* reader, Integer max_print, bool compare_ghost)
{
  VariableComparerArgs compare_args;
  compare_args.setMaxPrint(max_print);
  compare_args.setCompareGhost(compare_ghost);
  compare_args.setDataReader(reader);
  VariableComparerResults r = _compareVariable(compare_args);
  return r.nbDifference();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
IMesh* Variable::
mesh() const
{
  if (m_p->m_mesh_handle.hasMesh())
    return m_p->m_mesh_handle.mesh();
  return nullptr;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
MeshHandle Variable::
meshHandle() const
{
  return m_p->m_mesh_handle;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
ItemGroup Variable::
itemGroup() const
{
  return m_p->m_item_group;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
eItemKind Variable::
itemKind() const
{
  return m_p->m_infos.itemKind();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Integer Variable::
dimension() const
{
  return m_p->m_infos.dimension();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Integer Variable::
multiTag() const
{
  return m_p->m_infos.multiTag();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
bool Variable::
isPartial() const
{
  return m_p->m_is_partial;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
IItemFamily* Variable::
itemFamily() const
{
  return m_p->m_item_family;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
_setData(const Ref<IData>& data)
{
  m_p->m_data = data;
  if (!data.get()) {
    ARCANE_FATAL("Données invalides : nom={0} type de données={1} dimension={2} multitag={3}",
                 m_p->m_infos.fullName(), m_p->m_infos.dataType(),
                 m_p->m_infos.dimension(), m_p->m_infos.multiTag());
  }
  data->setName(m_p->m_infos.fullName());
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
_setValidData(bool valid_data)
{
  m_p->m_has_valid_data = valid_data;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
bool Variable::
_hasValidData() const
{
  return m_p->m_has_valid_data;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
_setProperty(int property)
{
  m_p->m_property |= property;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
IDataFactoryMng* Variable::
dataFactoryMng() const
{
  return m_p->m_data_factory_mng;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
serialize(ISerializer* sbuffer, Int32ConstArrayView ids, IDataOperation* operation)
{
  debug(Trace::High) << "Sérialisation (partielle) de la variable nom=" << fullName();
  m_p->serializeHashId(sbuffer);
  m_p->m_data->serialize(sbuffer, ids, operation);
  // En mode lecture, les données sont modifiées
  if (sbuffer->mode() == ISerializer::ModeGet)
    syncReferences();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
serialize(ISerializer* sbuffer, IDataOperation* operation)
{
  debug(Trace::High) << "Sérialisation (complète) de la variable nom=" << fullName();
 
  m_p->serializeHashId(sbuffer);
  m_p->m_data->serialize(sbuffer, operation);
  // En mode lecture, les données sont modifiées
  if (sbuffer->mode() == ISerializer::ModeGet)
    syncReferences();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
_resize(const VariableResizeArgs& resize_args)
{
  eItemKind ik = itemKind();
  if (ik != IK_Unknown) {
    ARCANE_FATAL("Cet appel est invalide pour une variable d'élément. Utilisez resizeFromGroup() à la place");
  }
  _internalResize(resize_args);
  syncReferences();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
resize(Integer new_size)
{
  _resize(VariableResizeArgs(new_size));
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
resizeFromGroup()
{
  eItemKind ik = itemKind();
  if (ik == IK_Unknown)
    return;
  Integer new_size = 0;
  IItemFamily* family = m_p->m_item_family;
  if (family) {
    if (m_p->m_item_group.isAllItems())
      new_size = m_p->m_item_family->maxLocalId();
    else
      new_size = m_p->m_item_group.size();
  }
  else {
    ItemGroup group = m_p->m_item_group;
    if (!group.null()) {
      ARCANE_FATAL("Variable '{0}' has group but no family", fullName());
    }
  }
  debug(Trace::High) << "Variable::resizeFromGroup() var='" << fullName()
                     << "' with " << new_size << " items "
                     << " this=" << this;
  _internalResize(VariableResizeArgs(new_size, new_size / 20));
  syncReferences();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
_checkSetItemFamily()
{
  if (m_p->m_item_family || !m_p->m_item_group.null())
    return;
 
  if (m_p->m_mesh_handle.isNull())
    m_p->m_mesh_handle = m_p->m_sub_domain->meshMng()->findMeshHandle(m_p->m_infos.meshName());
 
  IMesh* mesh = m_p->m_mesh_handle.mesh();
  if (!mesh)
    ARCANE_FATAL("No mesh named '{0}' exists for variable '{1}'", m_p->m_infos.meshName(), name());
 
  eItemKind ik = itemKind();
 
  IItemFamily* family = 0;
  const String& family_name = m_p->m_infos.itemFamilyName();
  if (ik == IK_Particle || ik == IK_DoF) {
    if (family_name.null()) {
      ARCANE_FATAL("family name not specified for variable {0}", name());
    }
    family = mesh->findItemFamily(ik, family_name, true);
  }
  else {
    family = mesh->itemFamily(ik);
  }
 
  if (family && family->itemKind() != itemKind())
    ARCANE_FATAL("Bad family kind '{0}' '{1}'", family->itemKind(), itemKind());
 
  if (family && family->name() != itemFamilyName())
    ARCANE_FATAL("Incoherent family name. var={0} from_type={1} given={2}",
                 name(), family->name(), itemFamilyName());
 
  if (!family)
    ARCANE_FATAL("Family not found");
 
  if (isPartial() && !family->hasUniqueIdMap())
    ARCANE_FATAL("Cannot have partial variable for a family without unique id map");
 
  m_p->m_item_family = family;
  debug(Trace::High) << "Variable::setItemFamily() name=" << name()
                     << " family=" << family
                     << " familyname='" << family_name << "'";
  family->_internalApi()->addVariable(this);
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
_checkSetItemGroup()
{
  if (!m_p->m_item_group.null())
    return;
  const String& group_name = m_p->m_infos.itemGroupName();
  //info() << " CHECK SET GROUP var=" << name() << " group=" << group_name;
  if (group_name.null()) {
    m_p->m_item_group = m_p->m_item_family->allItems();
  }
  else
    m_p->m_item_group = m_p->m_item_family->findGroup(group_name, true);
 
  ItemGroupImpl* internal = m_p->m_item_group.internal();
  // (HP) TODO: faut il garder ce controle hérité de l'ancienne implémentation de addVariable
  if (internal->parent() && (mesh()->parallelMng()->isParallel() && internal->isOwn()))
    ARCANE_FATAL("Cannot add variable ({0}) on a own group (name={1})",
                 fullName(), internal->name());
  if (isPartial()) {
    if (group_name.empty())
      ARCANE_FATAL("Cannot create a partial variable with an empty item_group_name");
    debug(Trace::High) << "Attach ItemGroupPartialVariableObserver from " << fullName()
                       << " to " << m_p->m_item_group.name();
    internal->attachObserver(this, new ItemGroupPartialVariableObserver(this));
  }
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
IObservable* Variable::
writeObservable()
{
  return &(m_p->m_write_observable);
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
IObservable* Variable::
readObservable()
{
  return &(m_p->m_read_observable);
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
IObservable* Variable::
onSizeChangedObservable()
{
  return &(m_p->m_on_size_changed_observable);
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
update()
{
  update(DPT_PreviousTime);
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
update(Real wanted_time)
{
  if (m_p->m_last_update_time < wanted_time) {
    for (Integer k = 0, n = m_p->m_depends.size(); k < n; ++k) {
      VariableDependInfo& vdi = m_p->m_depends[k];
      if (vdi.dependType() == DPT_PreviousTime)
        vdi.variable()->update(wanted_time);
    }
  }
 
  if (m_p->m_has_recursive_depend) {
    for (Integer k = 0, n = m_p->m_depends.size(); k < n; ++k) {
      VariableDependInfo& vdi = m_p->m_depends[k];
      if (vdi.dependType() == DPT_CurrentTime)
        vdi.variable()->update(m_p->m_last_update_time);
    }
  }
 
  bool need_update = false;
  Int64 modified_time = m_p->m_modified_time;
  for (Integer k = 0, n = m_p->m_depends.size(); k < n; ++k) {
    VariableDependInfo& vdi = m_p->m_depends[k];
    Int64 mt = vdi.variable()->modifiedTime();
    if (mt > modified_time) {
      need_update = true;
      break;
    }
  }
  if (need_update) {
    IVariableComputeFunction* cf = m_p->m_compute_function.get();
    //msg->info() << "Need Compute For Variable <" << name() << "> " << cf;
    if (cf) {
      //msg->info() << "Compute For Variable <" << name() << ">";
      cf->execute();
    }
    else {
      ARCANE_FATAL("No compute function for variable '{0}'", fullName());
    }
  }
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
setUpToDate()
{
  m_p->m_last_update_time = subDomain()->commonVariables().globalTime();
  m_p->m_modified_time = IVariable::incrementModifiedTime();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
Int64 Variable::
modifiedTime()
{
  return m_p->m_modified_time;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
addDepend(IVariable* var, eDependType dt)
{
  m_p->m_depends.add(VariableDependInfo(var, dt, TraceInfo()));
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
addDepend(IVariable* var, eDependType dt, const TraceInfo& tinfo)
{
  m_p->m_depends.add(VariableDependInfo(var, dt, tinfo));
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
removeDepend(IVariable* var)
{
  ARCANE_UNUSED(var);
  throw NotImplementedException(A_FUNCINFO);
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
setComputeFunction(IVariableComputeFunction* v)
{
  m_p->m_compute_function = v;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
IVariableComputeFunction* Variable::
computeFunction()
{
  return m_p->m_compute_function.get();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
dependInfos(Array<VariableDependInfo>& infos)
{
  for (Integer k = 0, n = m_p->m_depends.size(); k < n; ++k) {
    VariableDependInfo& vdi = m_p->m_depends[k];
    infos.add(vdi);
  }
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
addTag(const String& tagname, const String& tagvalue)
{
  m_p->m_tags[tagname] = tagvalue;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
removeTag(const String& tagname)
{
  m_p->m_tags.erase(tagname);
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
bool Variable::
hasTag(const String& tagname)
{
  return m_p->m_tags.find(tagname) != m_p->m_tags.end();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
String Variable::
tagValue(const String& tagname)
{
  std::map<String, String>::const_iterator i = m_p->m_tags.find(tagname);
  if (i == m_p->m_tags.end())
    return String();
  return i->second;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
notifyEndRead()
{
  setUpToDate();
  syncReferences();
  readObservable()->notifyAllObservers();
  _setValidData(true);
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
notifyBeginWrite()
{
  writeObservable()->notifyAllObservers();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
read(IDataReader* reader)
{
  reader->read(this, data());
  notifyEndRead();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
write(IDataWriter* writer)
{
  notifyBeginWrite();
  writer->write(this, data());
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
changeGroupIds(Int32ConstArrayView old_to_new_ids)
{
  ARCANE_UNUSED(old_to_new_ids);
  // pH: default implementation since this method is not yet official
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/

void Variable::
_checkSwapIsValid(Variable* rhs)
{
  if (!m_p->m_is_used)
    ARCANE_FATAL("Can not swap variable values for unused variable (instance)");
  if (!rhs->m_p->m_is_used)
    ARCANE_FATAL("Can not swap variable values for unused variable (argument)");
  if (isPartial() || rhs->isPartial())
    ARCANE_FATAL("Can not swap variable values for partial variables");
  if (itemGroup() != rhs->itemGroup())
    ARCANE_FATAL("Can not swap variable values for variables from different groups");
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
bool Variable::
_wantShrink() const
{
  return m_p->m_want_shrink;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void Variable::
setAllocationInfo(const DataAllocationInfo& v)
{
  data()->setAllocationInfo(v);
  // Il est possible que le changement d'allocation modifie les données
  // allouées. Il faut donc synchroniser les références.
  syncReferences();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
DataAllocationInfo Variable::
allocationInfo() const
{
  return data()->allocationInfo();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
IVariableInternal* Variable::
_internalApi()
{
  return m_p;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
String VariablePrivate::
computeComparisonHashCollective(IHashAlgorithm* hash_algo,
                                IData* sorted_data)
{
  ARCANE_CHECK_POINTER(hash_algo);
  ARCANE_CHECK_POINTER(sorted_data);
 
  INumericDataInternal* num_data = sorted_data->_commonInternal()->numericData();
  if (!num_data)
    return {};
  if (!m_item_family)
    return {};
 
  IParallelMng* pm = m_item_family->parallelMng();
  Int32 my_rank = pm->commRank();
  Int32 master_rank = pm->masterIORank();
  ConstMemoryView memory_view = num_data->memoryView();
 
  UniqueArray<Byte> bytes;
 
  pm->gatherVariable(Arccore::asSpan<Byte>(memory_view.bytes()).smallView(), bytes, master_rank);
 
  String hash_string;
  if (my_rank == master_rank) {
    HashAlgorithmValue hash_value;
    hash_algo->computeHash(asBytes(bytes), hash_value);
    hash_string = Convert::toHexaString(asBytes(hash_value.bytes()));
  }
  return hash_string;
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void VariablePrivate::
changeAllocator(const MemoryAllocationOptions& mem_options)
{
  INumericDataInternal* dx = m_data->_commonInternal()->numericData();
  if (dx) {
    dx->changeAllocator(mem_options);
    m_variable->syncReferences();
  }
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
void VariablePrivate::
resize(const VariableResizeArgs& resize_args)
{
  return m_variable->_resize(resize_args);
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
VariableComparerResults VariablePrivate::
compareVariable(const VariableComparerArgs& compare_args)
{
  return m_variable->_compareVariable(compare_args);
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
IParallelMng* VariablePrivate::
replicaParallelMng() const
{
  //TODO: regarder si la variable est utilisée.
  IMesh* mesh = m_variable->mesh();
  // TODO: faut-il prendre le sous-domaine dans ce cas ?
  IParallelMng* pm = (mesh) ? mesh->parallelMng() : m_variable->subDomain()->parallelMng();
  IParallelReplication* pr = pm->replication();
  if (!pr->hasReplication())
    return nullptr;
  return pr->replicaParallelMng();
}
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
} // End namespace Arcane
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
#endif