generic_assembly.hh

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/*!
 *
 * Copyright (C) 2015 Technical University of Liberec.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 3 as published by the
 * Free Software Foundation. (http://www.gnu.org/licenses/gpl-3.0.en.html)
 *
 * This program 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.
 *
 *
 * @file    generic_assembly.hh
 * @brief
 */
 
#ifndef GENERIC_ASSEMBLY_HH_
#define GENERIC_ASSEMBLY_HH_
 
#include "quadrature/quadrature_lib.hh"
#include "fem/integral_acc.hh"
#include "fem/eval_points.hh"
#include "fem/element_cache_map.hh"
#include "fem/patch_fe_values.hh"
#include "tools/revertable_list.hh"
#include "system/sys_profiler.hh"
 
 
 
/// Holds common data shared between GenericAssemblz and Assembly<dim> classes.
struct AssemblyInternals {
public:
    AssemblyInternals()
    : eval_points_(std::make_shared<EvalPoints>()) {}
 
    AssemblyInternals(MixedPtr<FiniteElement> fe)
    : eval_points_(std::make_shared<EvalPoints>()), fe_values_(fe) {}
 
    std::shared_ptr<EvalPoints> eval_points_;                     ///< EvalPoints object shared by all integrals
    ElementCacheMap element_cache_map_;                           ///< ElementCacheMap according to EvalPoints
    PatchFEValues<3> fe_values_;                                  ///< Common FEValues object over all dimensions
};
 
 
/**
 * Common interface class for all Assembly classes.
 */
class GenericAssemblyBase
{
public:
    GenericAssemblyBase()
    {}
 
    GenericAssemblyBase(MixedPtr<FiniteElement> fe)
    : asm_internals_(fe)
    {}
 
    virtual ~GenericAssemblyBase(){}
 
    virtual void assemble(std::shared_ptr<DOFHandlerMultiDim> dh) = 0;
 
    /// Getter to EvalPoints object
    inline std::shared_ptr<EvalPoints> eval_points() const {
        return asm_internals_.eval_points_;
    }
 
protected:
    AssemblyInternals asm_internals_;                             ///< Holds shared internals data
};
 
 
/**
 * @brief Generic class of assemblation.
 *
 * Class
 *  - holds assemblation structures (EvalPoints, Integral objects, Integral data table).
 *  - associates assemblation objects specified by dimension
 *  - provides general assemble method
 *  - provides methods that allow construction of element patches
 */
template < template<IntDim...> class DimAssembly>
class GenericAssembly : public GenericAssemblyBase
{
public:
    /**
     * Constructor.
     *
     * Used in equations that don't need PatchFeValues objects in evaluation.
     * @param eq_fields   Descendant of FieldSet declared in equation
     * @param eq_data     Object defined in equation containing shared data of eqation and assembly class.
     */
    GenericAssembly( typename DimAssembly<1>::EqData *eq_data)
    : GenericAssemblyBase(),
      multidim_assembly_(eq_data, &this->asm_internals_)
    {
        initialize();
    }
 
    /**
     * Constructor.
     *
     * Used in equations working with PatchFeValues objects in evaluation.
     * @param eq_fields   Descendant of FieldSet declared in equation
     * @param eq_data     Object defined in equation containing shared data of eqation and assembly class.
     * @param dh          DOF handler object
     */
     GenericAssembly( typename DimAssembly<1>::EqData *eq_data, DOFHandlerMultiDim* dh)
    : GenericAssemblyBase(dh->ds()->fe()),
      multidim_assembly_(eq_data, &this->asm_internals_)
    {
        initialize();
    }
 
    /// Getter to set of assembly objects
    inline MixedPtr<DimAssembly, 1> multidim_assembly() const {
        return multidim_assembly_;
    }
 
    /// Allows to rewrite number of minimal edge sides.
    void set_min_edge_sides(unsigned int val) {
        multidim_assembly_[1_d]->set_min_edge_sides(val);
        multidim_assembly_[2_d]->set_min_edge_sides(val);
        multidim_assembly_[3_d]->set_min_edge_sides(val);
    }
 
    /**
     * @brief General assemble method.
     *
     * Loops through local cells and calls assemble methods of assembly
     * object of each cells over space dimension.
     *
     * TODO:
     * - make estimate of the cache fill for combination of (integral_type x element dimension)
     * - add next cell to patch if current_patch_size + next_element_size <= fixed_cache_size
     * - avoid reverting the integral data lists.
     */
    void assemble(std::shared_ptr<DOFHandlerMultiDim> dh) override {
        START_TIMER( DimAssembly<1>::name() );
        this->reallocate_cache();
        multidim_assembly_[1_d]->begin();
 
        bool add_into_patch = false; // control variable
        for(auto cell_it = dh->local_range().begin(); cell_it != dh->local_range().end(); )
        {
            unsigned int cell_dim = cell_it->dim();
            if (!add_into_patch) {
                asm_internals_.element_cache_map_.start_elements_update();
                add_into_patch = true;
            }
 
            START_TIMER("add_integrals_to_patch");
            bool is_patch_full = false;
            switch ( cell_dim ) {
            case 1:
                is_patch_full = multidim_assembly_[1_d]->add_integrals_of_computing_step(*cell_it);
                break;
            case 2:
                is_patch_full = multidim_assembly_[2_d]->add_integrals_of_computing_step(*cell_it);
                break;
            case 3:
                is_patch_full = multidim_assembly_[3_d]->add_integrals_of_computing_step(*cell_it);
                break;
            default:
                ASSERT(false).error("Should not happen!");
            }
            END_TIMER("add_integrals_to_patch");
 
            if (is_patch_full) {
                asm_internals_.element_cache_map_.eval_point_data_.revert_temporary();
                this->assemble_integrals();
                add_into_patch = false;
            } else {
                asm_internals_.element_cache_map_.make_paermanent_eval_points();
                asm_internals_.fe_values_.make_permanent_ppv_data();
                if (asm_internals_.element_cache_map_.get_simd_rounded_size() == CacheMapElementNumber::get()) {
                    this->assemble_integrals();
                    add_into_patch = false;
                }
                ++cell_it;
            }
        }
        if (add_into_patch) {
            this->assemble_integrals();
        }
 
        multidim_assembly_[1_d]->end();
        END_TIMER( DimAssembly<1>::name() );
    }
 
    /// Return ElementCacheMap
    inline const ElementCacheMap &cache_map() const {
        return asm_internals_.element_cache_map_;
    }
 
private:
    /// Common part of GenericAssemblz constructors.
    void initialize() {
        asm_internals_.element_cache_map_.init(asm_internals_.eval_points_);
        multidim_assembly_[1_d]->initialize();
        multidim_assembly_[2_d]->initialize();
        multidim_assembly_[3_d]->initialize();
        asm_internals_.fe_values_.init_finalize();
    }
 
    /// Call assemblations when patch is filled
    void assemble_integrals() {
        START_TIMER("create_patch");
        asm_internals_.element_cache_map_.create_patch();
        END_TIMER("create_patch");
 
        START_TIMER("cache_update");
        multidim_assembly_[1_d]->eq_fields_->cache_update(asm_internals_.element_cache_map_); // TODO replace with sub FieldSet
        END_TIMER("cache_update");
 
        START_TIMER("patch_reinit");
        patch_reinit(); // reinit PatchFeValues
        END_TIMER("patch_reinit");
 
        asm_internals_.element_cache_map_.finish_elements_update();
 
        {
            START_TIMER("assemble_volume_integrals");
            multidim_assembly_[1_d]->assemble_cell_integrals();
            multidim_assembly_[2_d]->assemble_cell_integrals();
            multidim_assembly_[3_d]->assemble_cell_integrals();
            END_TIMER("assemble_volume_integrals");
        }
 
        {
            START_TIMER("assemble_fluxes_boundary");
            multidim_assembly_[1_d]->assemble_boundary_side_integrals();
            multidim_assembly_[2_d]->assemble_boundary_side_integrals();
            multidim_assembly_[3_d]->assemble_boundary_side_integrals();
            END_TIMER("assemble_fluxes_boundary");
        }
 
        {
            START_TIMER("assemble_fluxes_elem_elem");
            multidim_assembly_[1_d]->assemble_edge_integrals();
            multidim_assembly_[2_d]->assemble_edge_integrals();
            multidim_assembly_[3_d]->assemble_edge_integrals();
            END_TIMER("assemble_fluxes_elem_elem");
        }
 
        {
            START_TIMER("assemble_fluxes_elem_side");
            multidim_assembly_[1_d]->assemble_neighbour_integrals();
            multidim_assembly_[2_d]->assemble_neighbour_integrals();
            END_TIMER("assemble_fluxes_elem_side");
        }
        // clean integral data
        multidim_assembly_[1_d]->clean_integral_data();
        multidim_assembly_[2_d]->clean_integral_data();
        multidim_assembly_[3_d]->clean_integral_data();
        asm_internals_.element_cache_map_.clear_element_eval_points_map();
        asm_internals_.fe_values_.reset();
    }
 
    /// Reinit PatchFeValues object during construction of patch
    void patch_reinit() {
        asm_internals_.fe_values_.clean_elements_map();
        asm_internals_.fe_values_.add_patch_points<3>(multidim_assembly_[3_d]->integrals(), &asm_internals_.element_cache_map_, asm_internals_.eval_points_);
        asm_internals_.fe_values_.add_patch_points<2>(multidim_assembly_[2_d]->integrals(), &asm_internals_.element_cache_map_, asm_internals_.eval_points_);
        asm_internals_.fe_values_.add_patch_points<1>(multidim_assembly_[1_d]->integrals(), &asm_internals_.element_cache_map_, asm_internals_.eval_points_);
 
        asm_internals_.fe_values_.reinit_patch();
    }
 
    /// Calls cache_reallocate method on
    inline void reallocate_cache() {
        multidim_assembly_[1_d]->eq_fields_->cache_reallocate(asm_internals_.element_cache_map_, multidim_assembly_[1_d]->used_fields_);
        // DebugOut() << "Order of evaluated fields (" << DimAssembly<1>::name() << "):" << multidim_assembly_[1_d]->eq_fields_->print_dependency();
    }
 
 
    MixedPtr<DimAssembly, 1> multidim_assembly_;                     ///< Assembly object
};
 
 
#endif /* GENERIC_ASSEMBLY_HH_ */