Teko_LU2x2PreconditionerFactory.cpp

// @HEADER
// *****************************************************************************
//      Teko: A package for block and physics based preconditioning
//
// Copyright 2010 NTESS and the Teko contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#include "Teko_LU2x2PreconditionerFactory.hpp"

// Teko includes
#include "Teko_LU2x2InverseOp.hpp"
#include "Teko_BlockUpperTriInverseOp.hpp"

// default strategies
#include "Teko_LU2x2DiagonalStrategy.hpp"
#include "NS/Teko_PCDStrategy.hpp"

using Teuchos::rcp;
using Teuchos::RCP;

namespace Teko {

// construct a PreconditionerFactory
LU2x2PreconditionerFactory::LU2x2PreconditionerFactory(LinearOp& invA00, LinearOp& invS)
    : invOpsStrategy_(rcp(new StaticLU2x2Strategy(invA00, invA00, invS))), useFullLDU_(true) {}

LU2x2PreconditionerFactory::LU2x2PreconditionerFactory(LinearOp& hatInvA00, LinearOp& tildeInvA00,
                                                       LinearOp& invS)
    : invOpsStrategy_(rcp(new StaticLU2x2Strategy(hatInvA00, tildeInvA00, invS))),
      useFullLDU_(true) {}

LU2x2PreconditionerFactory::LU2x2PreconditionerFactory(const RCP<LU2x2Strategy>& strategy)
    : invOpsStrategy_(strategy), useFullLDU_(true) {}

LU2x2PreconditionerFactory::LU2x2PreconditionerFactory()
    : invOpsStrategy_(Teuchos::null), useFullLDU_(true) {}

// for PreconditionerFactoryBase

// initialize a newly created preconditioner object
LinearOp LU2x2PreconditionerFactory::buildPreconditionerOperator(
    BlockedLinearOp& A, BlockPreconditionerState& state) const {
  Teko_DEBUG_SCOPE("LU2x2PreconditionerFactory::buildPreconditionerOperator", 10);
  LinearOp hatInvA00   = invOpsStrategy_->getHatInvA00(A, state);
  LinearOp tildeInvA00 = invOpsStrategy_->getTildeInvA00(A, state);
  LinearOp invS        = invOpsStrategy_->getInvS(A, state);

  // build the SchurSolve LinearOp
  if (useFullLDU())
    return createLU2x2InverseOp(A, hatInvA00, tildeInvA00, invS, "LU2x2-Full");
  else {
    std::vector<LinearOp> invDiag(2);
    invDiag[0] = hatInvA00;
    invDiag[1] = scale(-1.0, invS);
    return createBlockUpperTriInverseOp(A, invDiag, "LU2x2-Upper");
  }
}

void LU2x2PreconditionerFactory::initializeFromParameterList(
    const Teuchos::ParameterList& settings) {
  Teko_DEBUG_SCOPE("LU2x2PreconditionerFactory::initializeFromParameterList", 10);

  // use Golub & Wathen type or full LDU decomposition for inverse solve?
  bool useLDU = true;
  if (settings.isParameter("Use LDU")) useLDU = settings.get<bool>("Use LDU");
  setFullLDU(useLDU);

  // build strategy object
  std::string stratName            = settings.get<std::string>("Strategy Name");
  const Teuchos::ParameterList& pl = settings.sublist("Strategy Settings");
  invOpsStrategy_ = buildStrategy(stratName, pl, getInverseLibrary(), getRequestHandler());
}

Teuchos::RCP<Teuchos::ParameterList> LU2x2PreconditionerFactory::getRequestedParameters() const {
  Teko_DEBUG_SCOPE("LU2x2PreconditionerFactory::getRequestedParameters", 0);
  return invOpsStrategy_->getRequestedParameters();
}

bool LU2x2PreconditionerFactory::updateRequestedParameters(const Teuchos::ParameterList& pl) {
  Teko_DEBUG_SCOPE("LU2x2PreconditionerFactory::updateRequestedParameters", 0);
  return invOpsStrategy_->updateRequestedParameters(pl);
}

// Static members and methods

CloneFactory<LU2x2Strategy> LU2x2PreconditionerFactory::strategyBuilder_;

RCP<LU2x2Strategy> LU2x2PreconditionerFactory::buildStrategy(
    const std::string& name, const Teuchos::ParameterList& settings,
    const RCP<const InverseLibrary>& invLib, const RCP<RequestHandler>& rh) {
  Teko_DEBUG_SCOPE("LU2x2PreconditionerFactory::buildStrategy", 0);

  // initialize the defaults if necessary
  if (strategyBuilder_.cloneCount() == 0) initializeStrategyBuilder();

  Teko_DEBUG_MSG_BEGIN(1) std::vector<std::string> names;
  strategyBuilder_.getCloneNames(names);
  DEBUG_STREAM << "Strategy names = ";
  for (std::size_t i = 0; i < names.size(); i++) DEBUG_STREAM << names[i] << ", ";
  DEBUG_STREAM << std::endl;
  Teko_DEBUG_MSG_END()

      // request the preconditioner factory from the CloneFactory
      RCP<LU2x2Strategy>
          strategy = strategyBuilder_.build(name);

  if (strategy == Teuchos::null) {
    Teko_DEBUG_MSG("Warning: Could not build LU2x2Strategy named \""
                       << name << "\"...pressing on, failure expected",
                   0) return Teuchos::null;
  }

  // now that inverse library has been set,
  // pass in the parameter list
  strategy->setRequestHandler(rh);
  strategy->initializeFromParameterList(settings, *invLib);

  return strategy;
}

void LU2x2PreconditionerFactory::addStrategy(const std::string& name, const RCP<Cloneable>& clone) {
  Teko_DEBUG_SCOPE("LU2x2PreconditionerFactory::addStrategy", 10);

  // initialize the defaults if necessary
  if (strategyBuilder_.cloneCount() == 0) initializeStrategyBuilder();

  // add clone to builder
  strategyBuilder_.addClone(name, clone);
}

void LU2x2PreconditionerFactory::initializeStrategyBuilder() {
  Teko_DEBUG_SCOPE("LU2x2PreconditionerFactory::initializeStrategyBuilder", 10);

  RCP<Cloneable> clone;

  // add various strategies to the factory
  clone = rcp(new AutoClone<LU2x2DiagonalStrategy>());
  strategyBuilder_.addClone("Diagonal Strategy", clone);

  // add various strategies to the factory
  clone = rcp(new AutoClone<NS::PCDStrategy>());
  strategyBuilder_.addClone("NS PCD Strategy", clone);
}

}  // end namespace Teko