script_interface/walberla/EKContainer.hpp

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/*
 * Copyright (C) 2022-2023 The ESPResSo project
 *
 * This file is part of ESPResSo.
 *
 * ESPResSo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ESPResSo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include "config/config.hpp"
 
#ifdef WALBERLA
 
#include "EKFFT.hpp"
#include "EKNone.hpp"
#include "EKReactions.hpp"
#include "EKSpecies.hpp"
 
#include <walberla_bridge/electrokinetics/EKContainer.hpp>
#include <walberla_bridge/electrokinetics/EKinWalberlaBase.hpp>
 
#include "core/ek/EKWalberla.hpp"
#include "core/ek/Solver.hpp"
#include "core/system/System.hpp"
 
#include <script_interface/ObjectList.hpp>
#include <script_interface/ScriptInterface.hpp>
 
#include <cassert>
#include <memory>
#include <optional>
#include <string>
#include <variant>
 
namespace ScriptInterface::walberla {
 
class EKContainer : public ObjectList<EKSpecies> {
  using Base = ObjectList<EKSpecies>;
 
  std::variant<
#ifdef WALBERLA_FFT
      std::shared_ptr<EKFFT>,
#endif
      std::shared_ptr<EKNone>>
      m_poisson_solver;
 
  std::shared_ptr<EKReactions> m_ek_reactions;
  std::shared_ptr<::EK::EKWalberla> m_ek_instance;
  std::shared_ptr<::EK::EKWalberla::ek_container_type> m_ek_container;
  bool m_is_active;
 
  bool has_in_core(std::shared_ptr<EKSpecies> const &obj_ptr) const override {
    return m_ek_container->contains(obj_ptr->get_ekinstance());
  }
  void add_in_core(std::shared_ptr<EKSpecies> const &obj_ptr) override {
    context()->parallel_try_catch(
        [this, &obj_ptr]() { m_ek_container->add(obj_ptr->get_ekinstance()); });
  }
  void remove_in_core(std::shared_ptr<EKSpecies> const &obj_ptr) override {
    m_ek_container->remove(obj_ptr->get_ekinstance());
  }
 
  struct GetPoissonSolverAsVariant {
    template <typename T>
    auto operator()(std::shared_ptr<T> const &solver) const {
      return (solver) ? Variant{solver} : Variant{none};
    }
  };
 
  Variant get_solver() const {
    return std::visit(GetPoissonSolverAsVariant(), m_poisson_solver);
  }
 
  struct GetPoissonSolverCoreInstance {
    template <typename T>
    std::shared_ptr<::walberla::PoissonSolver>
    operator()(std::shared_ptr<T> const &solver) const {
      return solver->get_instance();
    }
  };
 
  auto extract_solver(Variant const &v) {
    std::optional<decltype(m_poisson_solver)> solver;
    auto so_ptr = get_value<ObjectRef>(v);
    if (auto ptr = std::dynamic_pointer_cast<EKNone>(so_ptr)) {
      solver = std::move(ptr);
    }
#ifdef WALBERLA_FFT
    else if (auto ptr = std::dynamic_pointer_cast<EKFFT>(so_ptr)) {
      solver = std::move(ptr);
    }
#endif
    assert(solver.has_value());
    return *solver;
  }
 
  void set_solver(Variant const &v) {
    m_poisson_solver = extract_solver(v);
    auto handle = std::visit(GetPoissonSolverCoreInstance{}, m_poisson_solver);
    context()->parallel_try_catch(
        [this, &handle]() { m_ek_container->set_poisson_solver(handle); });
  }
 
public:
  EKContainer() : Base::ObjectList() {
    add_parameters({
        {"tau", AutoParameter::read_only,
         [this]() { return m_ek_container->get_tau(); }},
        {"solver", [this](Variant const &v) { set_solver(v); },
         [this]() { return get_solver(); }},
        {"reactions", AutoParameter::read_only,
         [this]() { return m_ek_reactions; }},
        {"is_active", AutoParameter::read_only,
         [this]() { return m_is_active; }},
    });
  }
 
  void do_construct(VariantMap const &params) override {
    m_is_active = false;
    auto const tau = get_value<double>(params, "tau");
    context()->parallel_try_catch([tau]() {
      if (tau <= 0.) {
        throw std::domain_error("Parameter 'tau' must be > 0");
      }
    });
    m_poisson_solver = extract_solver(
        (params.count("solver") == 1) ? params.at("solver") : Variant{none});
    m_ek_container = std::make_shared<::EK::EKWalberla::ek_container_type>(
        tau, std::visit(GetPoissonSolverCoreInstance{}, m_poisson_solver));
    m_ek_reactions = get_value<decltype(m_ek_reactions)>(params, "reactions");
    m_ek_instance = std::make_shared<::EK::EKWalberla>(
        m_ek_container, m_ek_reactions->get_handle());
    // EK species must be added after tau
    Base::do_construct(params);
  }
 
protected:
  Variant do_call_method(std::string const &method,
                         VariantMap const &parameters) override {
    if (method == "activate") {
      context()->parallel_try_catch([this]() {
        ::System::get_system().ek.set<::EK::EKWalberla>(m_ek_instance);
      });
      m_is_active = true;
      return {};
    }
    if (method == "deactivate") {
      if (m_is_active) {
        ::System::get_system().ek.reset();
        m_is_active = false;
      }
      return {};
    }
 
    return Base::do_call_method(method, parameters);
  }
};
 
} // namespace ScriptInterface::walberla
 
#endif // WALBERLA