text: /**
   * \file
   * \copyright
   * Copyright (c) 2012-2020, OpenGeoSys Community (http://www.opengeosys.org)
   *            Distributed under a Modified BSD License.
   *              See accompanying file LICENSE.txt or
   *              http://www.opengeosys.org/project/license
   *
   */
  
  #pragma once
  
  #include "ProcessLib/Process.h"
  #include "HeatConductionFEM.h"
  #include "HeatConductionProcessData.h"
  
  namespace ProcessLib
  {
  namespace HeatConduction
  {
  class HeatConductionProcess final : public Process
  {
  
  public:
      HeatConductionProcess(
          std::string name,
          MeshLib::Mesh& mesh,
          std::unique_ptr<ProcessLib::AbstractJacobianAssembler>&&
              jacobian_assembler,
          std::vector<std::unique_ptr<ParameterLib::ParameterBase>> const&
              parameters,
          unsigned const integration_order,
          std::vector<std::vector<std::reference_wrapper<ProcessVariable>>>&&
              process_variables,
          HeatConductionProcessData&& process_data,
          SecondaryVariableCollection&& secondary_variables);
  
      //! \name ODESystem interface
      //! @{
  
      bool isLinear() const override { return true; }
  
      void computeSecondaryVariableConcrete(
          double const t, GlobalVector const& x, int const process_id) override;
  
  private:
      void initializeConcreteProcess(
          NumLib::LocalToGlobalIndexMap const& dof_table,
          MeshLib::Mesh const& mesh,
          unsigned const integration_order) override;
  
      void assembleConcreteProcess(const double t, double const /*dt*/,
                                   std::vector<GlobalVector*> const& x,
                                   std::vector<GlobalVector*> const& xdot,
                                   int const process_id, GlobalMatrix& M,
                                   GlobalMatrix& K, GlobalVector& b) override;
  
      void assembleWithJacobianConcreteProcess(
          const double t, double const /*dt*/,
          std::vector<GlobalVector*> const& x, GlobalVector const& xdot,
          const double dxdot_dx, const double dx_dx, int const process_id,
          GlobalMatrix& M, GlobalMatrix& K, GlobalVector& b,
          GlobalMatrix& Jac) override;
  
      HeatConductionProcessData _process_data;
  
      std::vector<std::unique_ptr<HeatConductionLocalAssemblerInterface>>
          _local_assemblers;
  
      /// Solution of the previous time step
      std::unique_ptr<GlobalVector> _x_previous_timestep = nullptr;
  };
  
  }  // namespace HeatConduction
  }  // namespace ProcessLib
  