interface.h

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// ------------------------------------------------------
//
// SPDX-License-Identifier: GPL-2.0-or-later
//
// SPDX-FileCopyrightText: Copyright (C) 2025 by the ASPECT authors.
//
// This file is part of ASPECT.
//
// Detailed license information governing the source code and
// contributions can be found in the folder LICENSES and in
// LICENSE and CONTRIBUTING.md at the top level directory.
//
// ------------------------------------------------------

#ifndef _aspect_simulator_solver_interface_h
#define _aspect_simulator_solver_interface_h

#include <aspect/global.h>
#include <aspect/simulator_access.h>


namespace aspect
{
  namespace StokesSolver
  {
    struct SolverOutputs
    {
      SolverOutputs()
        :
        initial_nonlinear_residual(numbers::signaling_nan<double>()),
        final_linear_residual(numbers::signaling_nan<double>()),
        pressure_normalization_adjustment(numbers::signaling_nan<double>())
      {}

      double initial_nonlinear_residual;
      double final_linear_residual;

      double pressure_normalization_adjustment;
    };

    template <int dim>
    class Interface: public SimulatorAccess<dim>, public Plugins::InterfaceBase
    {
      public:
        virtual
        SolverOutputs solve(const LinearAlgebra::BlockSparseMatrix &system_matrix,
                            const LinearAlgebra::BlockVector &system_rhs,
                            const bool solve_newton_system,
                            const double last_pressure_normalization_adjustment,
                            LinearAlgebra::BlockVector &solution_vector) = 0;

        virtual
        std::string name() const = 0;
    };
  }
}

#endif