MueLu_TwoLevelFactoryBase.hpp

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//        MueLu: A package for multigrid based preconditioning
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#ifndef MUELU_TWOLEVELFACTORY_HPP
#define MUELU_TWOLEVELFACTORY_HPP

#include "MueLu_ConfigDefs.hpp"

#include "MueLu_Factory.hpp"
#include "MueLu_Level.hpp"
#include "MueLu_TimeMonitor.hpp"
#include "MueLu_Utilities.hpp"

namespace MueLu {

  class TwoLevelFactoryBase : public Factory {

  public:



    TwoLevelFactoryBase() { }

    virtual ~TwoLevelFactoryBase()
    { }




    virtual void DeclareInput(Level &fineLevel, Level &coarseLevel) const = 0;

    virtual void CallDeclareInput(Level & requestedLevel) const {
      if (requestedLevel.GetPreviousLevel() == Teuchos::null) {
        std::ostringstream errStr;
        errStr << "LevelID = " << requestedLevel.GetLevelID();
        throw Exceptions::DependencyError(errStr.str());
      }
      DeclareInput(*requestedLevel.GetPreviousLevel(), requestedLevel);
    }





    virtual void Build(Level & fineLevel, Level & coarseLevel) const = 0;

    virtual void CallBuild(Level& requestedLevel) const {
      int levelID = requestedLevel.GetLevelID();

#ifdef HAVE_MUELU_DEBUG
      // We cannot call Build method twice for the same level, but we can call it multiple times for different levels
      TEUCHOS_TEST_FOR_EXCEPTION((multipleCallCheck_ == ENABLED) && (multipleCallCheckGlobal_ == ENABLED) && (lastLevelID_ == levelID),
                                 Exceptions::RuntimeError,
                                 this->ShortClassName() << "::Build() called twice for the same level (levelID=" << levelID
                                 << "). This is likely due to a configuration error, or calling hierarchy setup multiple times "
                                 << "without resetting debug info through FactoryManager::ResetDebugData().");
      if (multipleCallCheck_ == FIRSTCALL)
        multipleCallCheck_ = ENABLED;

      lastLevelID_ = levelID;
#endif
      TEUCHOS_TEST_FOR_EXCEPTION(requestedLevel.GetPreviousLevel() == Teuchos::null, Exceptions::RuntimeError, "LevelID = " << levelID);

      RCP<const Teuchos::Comm<int> > comm = requestedLevel.GetComm();
      if (comm.is_null()) {
        // Some factories are called before we constructed Ac, and therefore,
        // before we set the level communicator. For such factories we can get
        // the comm from the previous level, as all processes go there
        RCP<Level>& prevLevel = requestedLevel.GetPreviousLevel();
        if (!prevLevel.is_null())
          comm = prevLevel->GetComm();
      }

      int oldRank = -1;
      if (!comm.is_null())
        oldRank = SetProcRankVerbose(comm->getRank());

      // Synchronization timer
      std::string syncTimer = this->ShortClassName() + ": Build sync (level=" + toString(requestedLevel.GetLevelID()) + ")";
      if (this->timerSync_ && !comm.is_null()) {
        TimeMonitor timer(*this, syncTimer);
        comm->barrier();
      }

      Build(*requestedLevel.GetPreviousLevel(), requestedLevel);

      if (this->timerSync_ && !comm.is_null()) {
        TimeMonitor timer(*this, syncTimer);
        comm->barrier();
      }

      GetOStream(Test) << *RemoveFactoriesFromList(GetParameterList()) << std::endl;

      if (oldRank != -1)
        SetProcRankVerbose(oldRank);
    }


  }; //class TwoLevelFactoryBase


} //namespace MueLu

#define MUELU_TWOLEVELFACTORY_SHORT
#endif //ifndef MUELU_TWOLEVELFACTORY_HPP