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();
    }

    if (IsPrint(Test1))
      GetOStream(Test1) << *RemoveFactoriesFromList(GetParameterList()) << std::endl;
    else
      RemoveFactoriesFromList(GetParameterList())->print(GetOStream(Test0), Teuchos::ParameterList::PrintOptions().indent(0).showFlags(true).showDefault(false));

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


};  // class TwoLevelFactoryBase

}  // namespace MueLu

#define MUELU_TWOLEVELFACTORY_SHORT
#endif  // ifndef MUELU_TWOLEVELFACTORY_HPP