source: XIOS/dev/branch_openmp/src/node/axis.cpp @ 1338

#include "axis.hpp"

#include "attribute_template.hpp"
#include "object_template.hpp"
#include "group_template.hpp"
#include "message.hpp"
#include "type.hpp"
#include "context.hpp"
#include "context_client.hpp"
#include "context_server.hpp"
#include "xios_spl.hpp"
#include "inverse_axis.hpp"
#include "zoom_axis.hpp"
#include "interpolate_axis.hpp"
#include "server_distribution_description.hpp"
#include "client_server_mapping_distributed.hpp"
#include "distribution_client.hpp"

namespace xios {

   /// ////////////////////// Définitions ////////////////////// ///

   CAxis::CAxis(void)
      : CObjectTemplate<CAxis>()
      , CAxisAttributes(), isChecked(false), relFiles(), areClientAttributesChecked_(false)
      , isClientAfterTransformationChecked(false)
      , isDistributed_(false), hasBounds_(false), isCompressible_(false)
      , numberWrittenIndexes_(0), totalNumberWrittenIndexes_(0), offsetWrittenIndexes_(0)
      , transformationMap_(), hasValue(false), hasLabel(false)
   {
   }

   CAxis::CAxis(const StdString & id)
      : CObjectTemplate<CAxis>(id)
      , CAxisAttributes(), isChecked(false), relFiles(), areClientAttributesChecked_(false)
      , isClientAfterTransformationChecked(false)
      , isDistributed_(false), hasBounds_(false), isCompressible_(false)
      , numberWrittenIndexes_(0), totalNumberWrittenIndexes_(0), offsetWrittenIndexes_(0)
      , transformationMap_(), hasValue(false), hasLabel(false)
   {
   }

   CAxis::~CAxis(void)
   { /* Ne rien faire de plus */ }

   std::map<StdString, ETranformationType> *CAxis::transformationMapList_ptr = 0;

   bool CAxis::initializeTransformationMap(std::map<StdString, ETranformationType>& m)
   {
     m["zoom_axis"] = TRANS_ZOOM_AXIS;
     m["interpolate_axis"] = TRANS_INTERPOLATE_AXIS;
     m["inverse_axis"] = TRANS_INVERSE_AXIS;
     m["reduce_domain"] = TRANS_REDUCE_DOMAIN_TO_AXIS;
     m["extract_domain"] = TRANS_EXTRACT_DOMAIN_TO_AXIS;
   }

   bool CAxis::initializeTransformationMap()
   {
     if(CAxis::transformationMapList_ptr == 0) CAxis::transformationMapList_ptr = new std::map<StdString, ETranformationType>();
     (*CAxis::transformationMapList_ptr)["zoom_axis"]        = TRANS_ZOOM_AXIS;
     (*CAxis::transformationMapList_ptr)["interpolate_axis"] = TRANS_INTERPOLATE_AXIS;
     (*CAxis::transformationMapList_ptr)["inverse_axis"]     = TRANS_INVERSE_AXIS;
     (*CAxis::transformationMapList_ptr)["reduce_domain"]    = TRANS_REDUCE_DOMAIN_TO_AXIS;
     (*CAxis::transformationMapList_ptr)["extract_domain"]   = TRANS_EXTRACT_DOMAIN_TO_AXIS;
   }

   ///---------------------------------------------------------------

   const std::set<StdString> & CAxis::getRelFiles(void) const
   {
      return (this->relFiles);
   }

   bool CAxis::IsWritten(const StdString & filename) const
   {
      return (this->relFiles.find(filename) != this->relFiles.end());
   }

   bool CAxis::isWrittenCompressed(const StdString& filename) const
   {
      return (this->relFilesCompressed.find(filename) != this->relFilesCompressed.end());
   }

   bool CAxis::isDistributed(void) const
   {
      return isDistributed_;
   }

   /*!
    * Test whether the data defined on the axis can be outputted in a compressed way.
    *
    * \return true if and only if a mask was defined for this axis
    */
   bool CAxis::isCompressible(void) const
   {
      return isCompressible_;
   }

   void CAxis::addRelFile(const StdString & filename)
   {
      this->relFiles.insert(filename);
   }

   void CAxis::addRelFileCompressed(const StdString& filename)
   {
      this->relFilesCompressed.insert(filename);
   }

   //----------------------------------------------------------------

   const std::vector<int>& CAxis::getIndexesToWrite(void) const
   {
     return indexesToWrite;
   }

   /*!
     Returns the number of indexes written by each server.
     \return the number of indexes written by each server
   */
   int CAxis::getNumberWrittenIndexes() const
   {
     return numberWrittenIndexes_;
   }

   /*!
     Returns the total number of indexes written by the servers.
     \return the total number of indexes written by the servers
   */
   int CAxis::getTotalNumberWrittenIndexes() const
   {
     return totalNumberWrittenIndexes_;
   }

   /*!
     Returns the offset of indexes written by each server.
     \return the offset of indexes written by each server
   */
   int CAxis::getOffsetWrittenIndexes() const
   {
     return offsetWrittenIndexes_;
   }

   //----------------------------------------------------------------

   /*!
    * Compute the minimum buffer size required to send the attributes to the server(s).
    *
    * \return A map associating the server rank with its minimum buffer size.
    */
   std::map<int, StdSize> CAxis::getAttributesBufferSize()
   {
     CContextClient* client = CContext::getCurrent()->client;

     std::map<int, StdSize> attributesSizes = getMinimumBufferSizeForAttributes();

     bool isNonDistributed = (n == n_glo);

     if (client->isServerLeader())
     {
       // size estimation for sendServerAttribut
       size_t size = 6 * sizeof(size_t);
       // size estimation for sendNonDistributedValue
       if (isNonDistributed)
         size = std::max(size, CArray<double,1>::size(n_glo) + (isCompressible_ ? CArray<int,1>::size(n_glo) : 0));
       size += CEventClient::headerSize + getId().size() + sizeof(size_t);

       const std::list<int>& ranks = client->getRanksServerLeader();
       for (std::list<int>::const_iterator itRank = ranks.begin(), itRankEnd = ranks.end(); itRank != itRankEnd; ++itRank)
       {
         if (size > attributesSizes[*itRank])
           attributesSizes[*itRank] = size;
       }
     }

     if (!isNonDistributed)
     {
       // size estimation for sendDistributedValue
       std::map<int, std::vector<size_t> >::const_iterator it, ite = indSrv_.end();
       for (it = indSrv_.begin(); it != ite; ++it)
       {
         size_t sizeIndexEvent = CArray<int,1>::size(it->second.size());
         if (isCompressible_)
           sizeIndexEvent += CArray<int,1>::size(indWrittenSrv_[it->first].size());

         size_t sizeValEvent = CArray<double,1>::size(it->second.size());
         if (hasBounds_)
           sizeValEvent += CArray<double,2>::size(2 * it->second.size());
 
         if (hasLabel)
           sizeValEvent += CArray<StdString,1>::size(it->second.size());

         size_t size = CEventClient::headerSize + getId().size() + sizeof(size_t) + std::max(sizeIndexEvent, sizeValEvent);
         if (size > attributesSizes[it->first])
           attributesSizes[it->first] = size;
       }
     }

     return attributesSizes;
   }

   //----------------------------------------------------------------

   StdString CAxis::GetName(void)   { return (StdString("axis")); }
   StdString CAxis::GetDefName(void){ return (CAxis::GetName()); }
   ENodeType CAxis::GetType(void)   { return (eAxis); }

   //----------------------------------------------------------------

   CAxis* CAxis::createAxis()
   {
     CAxis* axis = CAxisGroup::get("axis_definition")->createChild();
     return axis;
   }

   void CAxis::fillInValues(const CArray<double,1>& values)
   {
     this->value = values;
   }

   void CAxis::checkAttributes(void)
   {
      if (this->n_glo.isEmpty())
        ERROR("CAxis::checkAttributes(void)",
              << "[ id = '" << getId() << "' , context = '" << CObjectFactory::GetCurrentContextId() << "' ] "
              << "The axis is wrongly defined, attribute 'n_glo' must be specified");
      StdSize size = this->n_glo.getValue();

      if (!this->index.isEmpty())
      {
        if (n.isEmpty()) n = index.numElements();

        // It's not so correct but if begin is not the first value of index 
        // then data on the local axis has user-defined distribution. In this case, begin has no meaning.
        if (begin.isEmpty()) begin = index(0);         
      }
      else 
      {
        if (!this->begin.isEmpty())
        {
          if (begin < 0 || begin > size - 1)
            ERROR("CAxis::checkAttributes(void)",
                  << "[ id = '" << getId() << "' , context = '" << CObjectFactory::GetCurrentContextId() << "' ] "
                  << "The axis is wrongly defined, attribute 'begin' (" << begin.getValue() << ") must be non-negative and smaller than size-1 (" << size - 1 << ").");
        }
        else this->begin.setValue(0);

        if (!this->n.isEmpty())
        {
          if (n < 0 || n > size)
            ERROR("CAxis::checkAttributes(void)",
                  << "[ id = '" << getId() << "' , context = '" << CObjectFactory::GetCurrentContextId() << "' ] "
                  << "The axis is wrongly defined, attribute 'n' (" << n.getValue() << ") must be non-negative and smaller than size (" << size << ").");
        }
        else this->n.setValue(size);

        {
          index.resize(n);
          for (int i = 0; i < n; ++i) index(i) = i+begin;
        }
      }

      if (!this->value.isEmpty())
      {
        StdSize true_size = value.numElements();
        if (this->n.getValue() != true_size)
          ERROR("CAxis::checkAttributes(void)",
                << "[ id = '" << getId() << "' , context = '" << CObjectFactory::GetCurrentContextId() << "' ] "
                << "The axis is wrongly defined, attribute 'value' has a different size (" << true_size << ") than the one defined by the \'size\' attribute (" << n.getValue() << ").");
        this->hasValue = true;
      }

      this->checkData();
      this->checkZoom();
      this->checkMask();
      this->checkBounds();
      this->checkLabel();

      isDistributed_ = (!this->begin.isEmpty() && !this->n.isEmpty() && (this->begin + this->n < this->n_glo)) ||
                       (!this->n.isEmpty() && (this->n != this->n_glo));

      // A same stupid condition to make sure that if there is only one client, axis
      // should be considered to be distributed. This should be a temporary solution     
      isDistributed_ |= (1 == CContext::getCurrent()->client->clientSize);
   }

   void CAxis::checkData()
   {
      if (data_begin.isEmpty()) data_begin.setValue(0);

      if (data_n.isEmpty())
      {
        data_n.setValue(n);
      }
      else if (data_n.getValue() < 0)
      {
        ERROR("CAxis::checkData(void)",
              << "[ id = " << this->getId() << " , context = '" << CObjectFactory::GetCurrentContextId() << " ] "
              << "The data size should be strictly positive ('data_n' = " << data_n.getValue() << ").");
      }

      if (data_index.isEmpty())
      {
        data_index.resize(data_n);
        for (int i = 0; i < data_n; ++i) data_index(i) = i;
      }
   }

   void CAxis::checkZoom(void)
   {
     if (global_zoom_begin.isEmpty()) global_zoom_begin.setValue(0);
     if (global_zoom_n.isEmpty()) global_zoom_n.setValue(n_glo.getValue());
   }

   void CAxis::checkMask()
   {
      if (!mask.isEmpty())
      {
         if (mask.extent(0) != n)
           ERROR("CAxis::checkMask(void)",
                 << "[ id = " << this->getId() << " , context = '" << CObjectFactory::GetCurrentContextId() << " ] "
                 << "The mask does not have the same size as the local domain." << std::endl
                 << "Local size is " << n.getValue() << "." << std::endl
                 << "Mask size is " << mask.extent(0) << ".");
      }
      else // (mask.isEmpty())
      { // If no mask was defined, we create a default one without any masked point.
         mask.resize(n);
         for (int i = 0; i < n; ++i)
         {
           mask(i) = true;
         }
      }
   }

  void CAxis::checkBounds()
  {
    if (!bounds.isEmpty())
    {
      if (bounds.extent(0) != 2 || bounds.extent(1) != n)
        ERROR("CAxis::checkAttributes(void)",
              << "The bounds array of the axis [ id = '" << getId() << "' , context = '" << CObjectFactory::GetCurrentContextId() << "' ] must be of dimension 2 x axis size." << std::endl
              << "Axis size is " << n.getValue() << "." << std::endl
              << "Bounds size is "<< bounds.extent(0) << " x " << bounds.extent(1) << ".");
      hasBounds_ = true;
    }
    else hasBounds_ = false;
  }

  void CAxis::checkLabel()
  {
    if (!label.isEmpty())
    {
      if (label.extent(0) != n)
        ERROR("CAxis::checkLabel(void)",
              << "The label array of the axis [ id = '" << getId() << "' , context = '" << CObjectFactory::GetCurrentContextId() << "' ] must be of dimension of axis size." << std::endl
              << "Axis size is " << n.getValue() << "." << std::endl
              << "label size is "<< label.extent(0)<<  " .");
      hasLabel = true;
    }
    else hasLabel = false;
  }
  void CAxis::checkEligibilityForCompressedOutput()
  {
    // We don't check if the mask is valid here, just if a mask has been defined at this point.
    isCompressible_ = !mask.isEmpty();
  }

  bool CAxis::zoomByIndex()
  {
    return (!global_zoom_index.isEmpty() && (0 != global_zoom_index.numElements()));
  }

  bool CAxis::dispatchEvent(CEventServer& event)
   {
      if (SuperClass::dispatchEvent(event)) return true;
      else
      {
        switch(event.type)
        {
           case EVENT_ID_SERVER_ATTRIBUT :
             recvServerAttribut(event);
             return true;
             break;
           case EVENT_ID_INDEX:
            recvIndex(event);
            return true;
            break;
          case EVENT_ID_DISTRIBUTED_VALUE:
            recvDistributedValue(event);
            return true;
            break;
          case EVENT_ID_NON_DISTRIBUTED_VALUE:
            recvNonDistributedValue(event);
            return true;
            break;
           default :
             ERROR("bool CAxis::dispatchEvent(CEventServer& event)",
                    << "Unknown Event");
           return false;
         }
      }
   }

   void CAxis::checkAttributesOnClient()
   {
     if (this->areClientAttributesChecked_) return;

     this->checkAttributes();

     this->areClientAttributesChecked_ = true;
   }

   void CAxis::checkAttributesOnClientAfterTransformation(const std::vector<int>& globalDim, int orderPositionInGrid,
                                                          CServerDistributionDescription::ServerDistributionType distType)
   {
     CContext* context=CContext::getCurrent() ;

     if (this->isClientAfterTransformationChecked) return;
     if (context->hasClient)
     {
       if (n.getValue() != n_glo.getValue()) computeConnectedServer(globalDim, orderPositionInGrid, distType);
     }

     this->isClientAfterTransformationChecked = true;
   }

   // Send all checked attributes to server
   void CAxis::sendCheckedAttributes(const std::vector<int>& globalDim, int orderPositionInGrid,
                                     CServerDistributionDescription::ServerDistributionType distType)
   {
     if (!this->areClientAttributesChecked_) checkAttributesOnClient();
     if (!this->isClientAfterTransformationChecked) checkAttributesOnClientAfterTransformation(globalDim, orderPositionInGrid, distType);
     CContext* context = CContext::getCurrent();

     if (this->isChecked) return;
     if (context->hasClient)
     {
       sendServerAttribut(globalDim, orderPositionInGrid, distType);
       if (hasValue) sendValue();
     }

     this->isChecked = true;
   }

  void CAxis::sendValue()
  {
     if (n.getValue() == n_glo.getValue())
       sendNonDistributedValue();
     else
       sendDistributedValue();
  }

  void CAxis::computeConnectedServer(const std::vector<int>& globalDim, int orderPositionInGrid,
                                     CServerDistributionDescription::ServerDistributionType distType)
  {
    CContext* context = CContext::getCurrent();
    CContextClient* client = context->client;
    int nbServer = client->serverSize;
    int range, clientSize = client->clientSize;
    int rank = client->clientRank;

    size_t ni = this->n.getValue();
    size_t ibegin = this->begin.getValue();
    size_t zoom_end = global_zoom_begin+global_zoom_n-1;
    size_t nZoomCount = 0;
    size_t nbIndex = index.numElements();

    int end = (0 == n) ? begin : begin + n - 1;
    int zoom_size = zoomByIndex() ? global_zoom_index.numElements() : global_zoom_n;
    int minInd = min(index);
    int maxInd = max(index);
    for (size_t idx = 0; idx < zoom_size; ++idx)
    {
      size_t globalZoomIndex = zoomByIndex() ? global_zoom_index(idx) : global_zoom_begin + idx;
      if (globalZoomIndex >= minInd && globalZoomIndex <= maxInd) ++nZoomCount;
    }

/*    for (size_t idx = 0; idx < nbIndex; ++idx)
    {
      size_t globalIndex = index(idx);
      if (globalIndex >= global_zoom_begin && globalIndex <= zoom_end) ++nZoomCount;
    }*/
    
    CArray<size_t,1> globalIndexAxis(nbIndex);
    for (size_t idx = 0; idx < nbIndex; ++idx)
    {      
      globalIndexAxis(idx) = (size_t)index(idx);
    }

    std::vector<size_t> globalAxisZoom(nZoomCount);
    nZoomCount = 0;
    for (size_t idx = 0; idx < zoom_size; ++idx)
    {
      size_t globalZoomIndex = zoomByIndex() ? global_zoom_index(idx) : global_zoom_begin + idx;
      if (globalZoomIndex >= minInd && globalZoomIndex <= maxInd)
      {
        globalAxisZoom[nZoomCount] = globalZoomIndex;
        ++nZoomCount;
      }
    }

    std::set<int> writtenInd;
    if (isCompressible_)
    {
      for (int idx = 0; idx < data_index.numElements(); ++idx)
      {
        int ind = CDistributionClient::getAxisIndex(data_index(idx), data_begin, ni);

        if (ind >= 0 && ind < ni && mask(ind))
        {
          ind += ibegin;
          if (ind >= global_zoom_begin && ind <= zoom_end)
            writtenInd.insert(ind);
        }
      }
    }

    CServerDistributionDescription serverDescriptionGlobal(globalDim, nbServer);
    int distributedDimensionOnServer = serverDescriptionGlobal.getDimensionDistributed();
    CClientServerMapping::GlobalIndexMap globalIndexAxisOnServer;
    if (distributedDimensionOnServer == orderPositionInGrid) // So we have distributed axis on client side and also on server side*
    {
      std::vector<int> nGlobAxis(1);
      nGlobAxis[0] = n_glo.getValue();

      size_t globalSizeIndex = 1, indexBegin, indexEnd;
      for (int i = 0; i < nGlobAxis.size(); ++i) globalSizeIndex *= nGlobAxis[i];
      indexBegin = 0;
      if (globalSizeIndex <= clientSize)
      {
        indexBegin = rank%globalSizeIndex;
        indexEnd = indexBegin;
      }
      else
      {
        for (int i = 0; i < clientSize; ++i)
        {
          range = globalSizeIndex / clientSize;
          if (i < (globalSizeIndex%clientSize)) ++range;
          if (i == client->clientRank) break;
          indexBegin += range;
        }
        indexEnd = indexBegin + range - 1;
      }

      CServerDistributionDescription serverDescription(nGlobAxis, nbServer);
      serverDescription.computeServerGlobalIndexInRange(std::make_pair<size_t,size_t>(indexBegin, indexEnd));
      CClientServerMapping* clientServerMap = new CClientServerMappingDistributed(serverDescription.getGlobalIndexRange(), client->intraComm);
      clientServerMap->computeServerIndexMapping(globalIndexAxis);
      globalIndexAxisOnServer = clientServerMap->getGlobalIndexOnServer();
      delete clientServerMap;
    }
    else
    {
      std::vector<size_t> globalIndexServer(n_glo.getValue());
      for (size_t idx = 0; idx < n_glo.getValue(); ++idx)
      {
        globalIndexServer[idx] = idx;
      }

      for (int idx = 0; idx < nbServer; ++idx)
      {
        globalIndexAxisOnServer[idx] = globalIndexServer;
      }
    }

    CClientServerMapping::GlobalIndexMap::const_iterator it = globalIndexAxisOnServer.begin(),
                                                         ite = globalIndexAxisOnServer.end();
    std::vector<size_t>::const_iterator itbVec = (globalAxisZoom).begin(),
                                        iteVec = (globalAxisZoom).end();
    indSrv_.clear();
    indWrittenSrv_.clear();
    for (; it != ite; ++it)
    {
      int rank = it->first;
      const std::vector<size_t>& globalIndexTmp = it->second;
      int nb = globalIndexTmp.size();

      for (int i = 0; i < nb; ++i)
      {
        if (std::binary_search(itbVec, iteVec, globalIndexTmp[i]))
        {
          indSrv_[rank].push_back(globalIndexTmp[i]);
        }

        if (writtenInd.count(globalIndexTmp[i]))
        {
          indWrittenSrv_[rank].push_back(globalIndexTmp[i]);
        }
      }
    }

    connectedServerRank_.clear();
    for (it = globalIndexAxisOnServer.begin(); it != ite; ++it) {
      connectedServerRank_.push_back(it->first);
    }

    if (!indSrv_.empty())
    {
      std::map<int, vector<size_t> >::const_iterator itIndSrv  = indSrv_.begin(),
                                                     iteIndSrv = indSrv_.end();
      connectedServerRank_.clear();
      for (; itIndSrv != iteIndSrv; ++itIndSrv)
        connectedServerRank_.push_back(itIndSrv->first);
    }
    nbConnectedClients_ = CClientServerMapping::computeConnectedClients(client->serverSize, client->clientSize, client->intraComm, connectedServerRank_);
  }

  void CAxis::sendNonDistributedValue()
  {
    CContext* context = CContext::getCurrent();
    CContextClient* client = context->client;
    CEventClient event(getType(), EVENT_ID_NON_DISTRIBUTED_VALUE);

    int zoom_end = global_zoom_begin + global_zoom_n - 1;
    int nb = 0;
/*    for (size_t idx = 0; idx < n; ++idx)
    {
      size_t globalIndex = begin + idx;
      if (globalIndex >= global_zoom_begin && globalIndex <= zoom_end) ++nb;
    }*/

    int end = (0 == n) ? begin : begin + n - 1;
    int zoom_size = zoomByIndex() ? global_zoom_index.numElements() : global_zoom_n;
    for (size_t idx = 0; idx < zoom_size; ++idx)
    {
      size_t globalZoomIndex = zoomByIndex() ? global_zoom_index(idx) : global_zoom_begin + idx;
      if (globalZoomIndex >= begin && globalZoomIndex <= end) ++nb;
    }

    int nbWritten = 0;
    if (isCompressible_)
    {
      for (int idx = 0; idx < data_index.numElements(); ++idx)
      {
        int ind = CDistributionClient::getAxisIndex(data_index(idx), data_begin, n);

        if (ind >= 0 && ind < n && mask(ind))
        {
          ind += begin;
          if (ind >= global_zoom_begin && ind <= zoom_end)
            ++nbWritten;
        }
      }
    }

    CArray<double,1> val(nb);
    nb = 0;
/*    for (size_t idx = 0; idx < n; ++idx)
    {
      size_t globalIndex = begin + idx;
      if (globalIndex >= global_zoom_begin && globalIndex <= zoom_end)
      {
        val(nb) = value(idx);
        ++nb;
      }
    }*/

    for (size_t idx = 0; idx < zoom_size; ++idx)
    {
      size_t globalZoomIndex = zoomByIndex() ? global_zoom_index(idx) : global_zoom_begin + idx;
      if (globalZoomIndex >= begin && globalZoomIndex <= end)
      {
        val(nb) = value(globalZoomIndex-begin);
        ++nb;
      }
    }

    CArray<int, 1> writtenInd(nbWritten);
    nbWritten = 0;
    if (isCompressible_)
    {
      for (int idx = 0; idx < data_index.numElements(); ++idx)
      {
        int ind = CDistributionClient::getAxisIndex(data_index(idx), data_begin, n);

        if (ind >= 0 && ind < n && mask(ind))
        {
          ind += begin;
          if (ind >= global_zoom_begin && ind <= zoom_end)
          {
            writtenInd(nbWritten) = ind;
            ++nbWritten;
          }
        }
      }
    }

    if (client->isServerLeader())
    {
      std::list<CMessage> msgs;

      const std::list<int>& ranks = client->getRanksServerLeader();
      for (std::list<int>::const_iterator itRank = ranks.begin(), itRankEnd = ranks.end(); itRank != itRankEnd; ++itRank)
      {
        msgs.push_back(CMessage());
        CMessage& msg = msgs.back();
        msg << this->getId();
        msg << val;
        if (isCompressible_)
          msg << writtenInd;
        event.push(*itRank, 1, msg);
      }
      client->sendEvent(event);
    }
    else client->sendEvent(event);
  }

  void CAxis::sendDistributedValue(void)
  {
    int ns, n, i, j, ind, nv, idx;
    CContext* context = CContext::getCurrent();
    CContextClient* client=context->client;

    // send value for each connected server
    CEventClient eventIndex(getType(), EVENT_ID_INDEX);
    CEventClient eventVal(getType(), EVENT_ID_DISTRIBUTED_VALUE);

    list<CMessage> list_msgsIndex, list_msgsVal;
    list<CArray<int,1> > list_indi;
    list<CArray<int,1> > list_writtenInd;
    list<CArray<double,1> > list_val;
    list<CArray<double,2> > list_bounds;
    list<CArray<StdString,1> > list_label;

    std::map<int, std::vector<size_t> >::const_iterator it, iteMap;
    iteMap = indSrv_.end();
    for (int k = 0; k < connectedServerRank_.size(); ++k)
    {
      int nbData = 0;
      int rank = connectedServerRank_[k];
      it = indSrv_.find(rank);
      if (iteMap != it)
        nbData = it->second.size();

      list_indi.push_back(CArray<int,1>(nbData));
      list_val.push_back(CArray<double,1>(nbData));

      if (hasBounds_)
      {
        list_bounds.push_back(CArray<double,2>(2,nbData));
      }
      
      if (hasLabel)
      {
        list_label.push_back(CArray<StdString,1>(nbData));
      }

      CArray<int,1>& indi = list_indi.back();
      CArray<double,1>& val = list_val.back();

      for (n = 0; n < nbData; ++n)
      {
        idx = static_cast<int>(it->second[n]);
        ind = idx - begin;

        val(n) = value(ind);
        indi(n) = idx;

        if (hasBounds_)
        {
          CArray<double,2>& boundsVal = list_bounds.back();
          boundsVal(0, n) = bounds(0,n);
          boundsVal(1, n) = bounds(1,n);
        }
        
        if (hasLabel)
        {
          CArray<StdString,1>& labelVal = list_label.back();
          labelVal(n) = label(n);
        }
      }

      list_msgsIndex.push_back(CMessage());
      list_msgsIndex.back() << this->getId() << list_indi.back();

      if (isCompressible_)
      {
        std::vector<int>& writtenIndSrc = indWrittenSrv_[rank];
        list_writtenInd.push_back(CArray<int,1>(writtenIndSrc.size()));
        CArray<int,1>& writtenInd = list_writtenInd.back();

        for (n = 0; n < writtenInd.numElements(); ++n)
          writtenInd(n) = writtenIndSrc[n];

        list_msgsIndex.back() << writtenInd;
      }

      list_msgsVal.push_back(CMessage());
      list_msgsVal.back() << this->getId() << list_val.back();

      if (hasBounds_)
      {
        list_msgsVal.back() << list_bounds.back();
      }
 
      if (hasLabel)
      {
        list_msgsVal.back() << list_label.back();
      }

      eventIndex.push(rank, nbConnectedClients_[rank], list_msgsIndex.back());
      eventVal.push(rank, nbConnectedClients_[rank], list_msgsVal.back());
    }

    client->sendEvent(eventIndex);
    client->sendEvent(eventVal);
  }

  void CAxis::recvIndex(CEventServer& event)
  {
    CAxis* axis;

    list<CEventServer::SSubEvent>::iterator it;
    for (it = event.subEvents.begin(); it != event.subEvents.end(); ++it)
    {
      CBufferIn* buffer = it->buffer;
      string axisId;
      *buffer >> axisId;
      axis = get(axisId);
      axis->recvIndex(it->rank, *buffer);
    }

    if (axis->isCompressible_)
    {
      std::sort(axis->indexesToWrite.begin(), axis->indexesToWrite.end());

      CContextServer* server = CContext::getCurrent()->server;
      axis->numberWrittenIndexes_ = axis->indexesToWrite.size();
      MPI_Allreduce(&axis->numberWrittenIndexes_, &axis->totalNumberWrittenIndexes_, 1, MPI_INT, MPI_SUM, server->intraComm);
      MPI_Scan(&axis->numberWrittenIndexes_, &axis->offsetWrittenIndexes_, 1, MPI_INT, MPI_SUM, server->intraComm);
      axis->offsetWrittenIndexes_ -= axis->numberWrittenIndexes_;
    }
  }

  void CAxis::recvIndex(int rank, CBufferIn& buffer)
  {
    buffer >> indiSrv_[rank];

    if (isCompressible_)
    {
      CArray<int, 1> writtenIndexes;
      buffer >> writtenIndexes;
      indexesToWrite.reserve(indexesToWrite.size() + writtenIndexes.numElements());
      for (int i = 0; i < writtenIndexes.numElements(); ++i)
        indexesToWrite.push_back(writtenIndexes(i));
    }
  }

  void CAxis::recvDistributedValue(CEventServer& event)
  {
    list<CEventServer::SSubEvent>::iterator it;
    for (it = event.subEvents.begin(); it != event.subEvents.end(); ++it)
    {
      CBufferIn* buffer = it->buffer;
      string axisId;
      *buffer >> axisId;
      get(axisId)->recvDistributedValue(it->rank, *buffer);
    }
  }

  void CAxis::recvDistributedValue(int rank, CBufferIn& buffer)
  {
    CArray<int,1> &indi = indiSrv_[rank];
    CArray<double,1> val;
    CArray<double,2> boundsVal;
    CArray<StdString,1> labelVal;

    buffer >> val;
    if (hasBounds_) buffer >> boundsVal;
    if (hasLabel) buffer >> labelVal;

    int i, j, ind_srv;
    for (int ind = 0; ind < indi.numElements(); ++ind)
    {
      i = indi(ind);
      ind_srv = i - zoom_begin_srv;
      value_srv(ind_srv) = val(ind);
      if (hasBounds_)
      {
        bound_srv(0,ind_srv) = boundsVal(0, ind);
        bound_srv(1,ind_srv) = boundsVal(1, ind);
      }

      if (hasLabel)
      {
        label_srv(ind_srv) = labelVal( ind);
      }

    }
  }

   void CAxis::recvNonDistributedValue(CEventServer& event)
  {
    CAxis* axis;

    list<CEventServer::SSubEvent>::iterator it;
    for (it = event.subEvents.begin(); it != event.subEvents.end(); ++it)
    {
      CBufferIn* buffer = it->buffer;
      string axisId;
      *buffer >> axisId;
      axis = get(axisId);
      axis->recvNonDistributedValue(it->rank, *buffer);
    }

    if (axis->isCompressible_)
    {
      std::sort(axis->indexesToWrite.begin(), axis->indexesToWrite.end());

      axis->numberWrittenIndexes_ = axis->totalNumberWrittenIndexes_ = axis->indexesToWrite.size();
      axis->offsetWrittenIndexes_ = 0;
    }
  }

  void CAxis::recvNonDistributedValue(int rank, CBufferIn& buffer)
  {
    CArray<double,1> val;
    buffer >> val;

    for (int ind = 0; ind < val.numElements(); ++ind)
    {
      value_srv(ind) = val(ind);
      if (hasBounds_)
      {
        bound_srv(0,ind) = bounds(0,ind);
        bound_srv(1,ind) = bounds(1,ind);
      }
      if (hasLabel)
      {
        label_srv(ind) = label(ind);
      }
    }

    if (isCompressible_)
    {
      CArray<int, 1> writtenIndexes;
      buffer >> writtenIndexes;
      indexesToWrite.reserve(indexesToWrite.size() + writtenIndexes.numElements());
      for (int i = 0; i < writtenIndexes.numElements(); ++i)
        indexesToWrite.push_back(writtenIndexes(i));
    }
  }

  void CAxis::sendServerAttribut(const std::vector<int>& globalDim, int orderPositionInGrid,
                                 CServerDistributionDescription::ServerDistributionType distType)
  {
    CContext* context = CContext::getCurrent();
    CContextClient* client = context->client;
    int nbServer = client->serverSize;

    CServerDistributionDescription serverDescription(globalDim, nbServer);
    serverDescription.computeServerDistribution();

    std::vector<std::vector<int> > serverIndexBegin = serverDescription.getServerIndexBegin();
    std::vector<std::vector<int> > serverDimensionSizes = serverDescription.getServerDimensionSizes();

    CEventClient event(getType(),EVENT_ID_SERVER_ATTRIBUT);
    if (client->isServerLeader())
    {
      std::list<CMessage> msgs;

      const std::list<int>& ranks = client->getRanksServerLeader();
      for (std::list<int>::const_iterator itRank = ranks.begin(), itRankEnd = ranks.end(); itRank != itRankEnd; ++itRank)
      {
        // Use const int to ensure CMessage holds a copy of the value instead of just a reference
        const int begin = serverIndexBegin[*itRank][orderPositionInGrid];
        const int ni    = serverDimensionSizes[*itRank][orderPositionInGrid];
        const int end   = begin + ni - 1;
        const bool zoomIndex = zoomByIndex();

        msgs.push_back(CMessage());
        CMessage& msg = msgs.back();
        msg << this->getId();
        msg << ni << begin << end;
        msg << global_zoom_begin.getValue() << global_zoom_n.getValue();
        msg << isCompressible_;
        msg << zoomIndex;
        if (zoomIndex)
          msg << global_zoom_index.getValue();

        event.push(*itRank,1,msg);
      }
      client->sendEvent(event);
    }
    else client->sendEvent(event);
  }

  void CAxis::recvServerAttribut(CEventServer& event)
  {
    CBufferIn* buffer = event.subEvents.begin()->buffer;
    string axisId;
    *buffer >> axisId;
    get(axisId)->recvServerAttribut(*buffer);
  }

  void CAxis::recvServerAttribut(CBufferIn& buffer)
  {
    int ni_srv, begin_srv, end_srv, global_zoom_begin_tmp, global_zoom_n_tmp;
    bool zoomIndex;    
    CArray<int,1> zoom_index_recv;
    std::vector<int> zoom_index_tmp;
    std::vector<int>::iterator itZoomBeginSrv, itZoomEndSrv, itZoomSrv;

    buffer >> ni_srv >> begin_srv >> end_srv;
    buffer >> global_zoom_begin_tmp >> global_zoom_n_tmp;
    buffer >> isCompressible_;
    buffer >> zoomIndex;
    if (zoomIndex)
    {
      buffer >> zoom_index_recv;
      global_zoom_index.reference(zoom_index_recv);
      zoom_index_tmp.resize(global_zoom_index.numElements());
      std::copy(global_zoom_index.begin(), global_zoom_index.end(), zoom_index_tmp.begin());
      std::sort(zoom_index_tmp.begin(), zoom_index_tmp.end());
      itZoomBeginSrv = std::lower_bound(zoom_index_tmp.begin(), zoom_index_tmp.end(), begin_srv);
      itZoomEndSrv   = std::upper_bound(zoom_index_tmp.begin(), zoom_index_tmp.end(), end_srv);      
      int sz = std::distance(itZoomBeginSrv, itZoomEndSrv);
      zoom_index_srv.resize(sz);
      itZoomSrv = itZoomBeginSrv;
      for (int i = 0; i < sz; ++i, ++itZoomSrv)
      {
        zoom_index_srv(i) = *(itZoomSrv);
      }
    }

    global_zoom_begin = global_zoom_begin_tmp;
    global_zoom_n  = global_zoom_n_tmp;
    int global_zoom_end = global_zoom_begin + global_zoom_n - 1;

    zoom_begin_srv = zoomIndex ? std::distance(itZoomBeginSrv, zoom_index_tmp.begin())
                                 : global_zoom_begin > begin_srv ? global_zoom_begin : begin_srv ;
    zoom_end_srv   = zoomIndex ? std::distance(zoom_index_tmp.begin(), itZoomEndSrv) - 1 
                                 : global_zoom_end < end_srv ? global_zoom_end : end_srv ;
    zoom_size_srv  = zoom_end_srv - zoom_begin_srv + 1;
     
    global_zoom_begin_srv = zoomIndex ? 0 : global_zoom_begin ;
    global_zoom_size_srv  = zoomIndex ? zoom_index_tmp.size() : global_zoom_n;

    if (zoom_size_srv<=0)
    {
      zoom_begin_srv = 0; zoom_end_srv = 0; zoom_size_srv = 0;
    }

    if (n_glo == n)
    {
      zoom_begin_srv = zoomIndex ? std::distance(itZoomBeginSrv, zoom_index_tmp.begin())
                                   : global_zoom_begin;      
      zoom_size_srv  = zoomIndex ? zoom_index_tmp.size()
                                   : global_zoom_n;
    }
    if (hasValue)
    {
      value_srv.resize(zoom_size_srv);
      if (hasBounds_)  bound_srv.resize(2,zoom_size_srv);
      if (hasLabel)  label_srv.resize(zoom_size_srv);
    }
  }

  /*!
    Compare two axis objects. 
    They are equal if only if they have identical attributes as well as their values.
    Moreover, they must have the same transformations.
  \param [in] axis Compared axis
  \return result of the comparison
  */
  bool CAxis::isEqual(CAxis* obj)
  {
    vector<StdString> excludedAttr;
    excludedAttr.push_back("axis_ref");

    bool objEqual = SuperClass::isEqual(obj, excludedAttr);    
    if (!objEqual) return objEqual;

    TransMapTypes thisTrans = this->getAllTransformations();
    TransMapTypes objTrans  = obj->getAllTransformations();

    TransMapTypes::const_iterator it, itb, ite;
    std::vector<ETranformationType> thisTransType, objTransType;
    for (it = thisTrans.begin(); it != thisTrans.end(); ++it)
      thisTransType.push_back(it->first);
    for (it = objTrans.begin(); it != objTrans.end(); ++it)
      objTransType.push_back(it->first);

    if (thisTransType.size() != objTransType.size()) return false;
    for (int idx = 0; idx < thisTransType.size(); ++idx)
      objEqual &= (thisTransType[idx] == objTransType[idx]);

    return objEqual;
  }

  CTransformation<CAxis>* CAxis::addTransformation(ETranformationType transType, const StdString& id)
  {
    transformationMap_.push_back(std::make_pair(transType, CTransformation<CAxis>::createTransformation(transType,id)));
    return transformationMap_.back().second;
  }

  bool CAxis::hasTransformation()
  {
    return (!transformationMap_.empty());
  }

  void CAxis::setTransformations(const TransMapTypes& axisTrans)
  {
    transformationMap_ = axisTrans;
  }

  CAxis::TransMapTypes CAxis::getAllTransformations(void)
  {
    return transformationMap_;
  }

  void CAxis::duplicateTransformation(CAxis* src)
  {
    if (src->hasTransformation())
    {
      this->setTransformations(src->getAllTransformations());
    }
  }

  /*!
   * Go through the hierarchy to find the axis from which the transformations must be inherited
   */
  void CAxis::solveInheritanceTransformation()
  {
    if (hasTransformation() || !hasDirectAxisReference())
      return;

    CAxis* axis = this;
    std::vector<CAxis*> refAxis;
    while (!axis->hasTransformation() && axis->hasDirectAxisReference())
    {
      refAxis.push_back(axis);
      axis = axis->getDirectAxisReference();
    }

    if (axis->hasTransformation())
      for (size_t i = 0; i < refAxis.size(); ++i)
        refAxis[i]->setTransformations(axis->getAllTransformations());
  }

  void CAxis::parse(xml::CXMLNode & node)
  {
    SuperClass::parse(node);

    if (node.goToChildElement())
    {
      StdString nodeElementName;
      do
      {
        StdString nodeId("");
        if (node.getAttributes().end() != node.getAttributes().find("id"))
        { nodeId = node.getAttributes()["id"]; }

        nodeElementName = node.getElementName();

        if(transformationMapList_ptr == 0) initializeTransformationMap();
        std::map<StdString, ETranformationType>::const_iterator ite = (*CAxis::transformationMapList_ptr).end(), it;
        it = (*CAxis::transformationMapList_ptr).find(nodeElementName);
        if (ite != it)
        {
          transformationMap_.push_back(std::make_pair(it->second, CTransformation<CAxis>::createTransformation(it->second,
                                                                                                               nodeId,
                                                                                                               &node)));
        }
        else
        {
          ERROR("void CAxis::parse(xml::CXMLNode & node)",
                << "The transformation " << nodeElementName << " has not been supported yet.");
        }
      } while (node.goToNextElement()) ;
      node.goToParentElement();
    }
  }

  DEFINE_REF_FUNC(Axis,axis)

   ///---------------------------------------------------------------

} // namespace xios