artis-star/src/artis-star/kernel/pdevs/mpi/LogicalProcessor.hpp

/**
 * @file kernel/pdevs/mpi/LogicalProcessor.hpp
 * @author The ARTIS Development Team
 * See the AUTHORS or Authors.txt file
 */

/*
 * ARTIS - the multimodeling and simulation environment
 * This file is a part of the ARTIS environment
 *
 * Copyright (C) 2013-2019 ULCO http://www.univ-littoral.fr
 *
 * This program 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.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef PDEVS_MPI_LOGICAL_PROCESSOR
#define PDEVS_MPI_LOGICAL_PROCESSOR 1

#include <artis-star/kernel/pdevs/mpi/ModelProxy.hpp>

#include <boost/mpi/communicator.hpp>

namespace artis {
    namespace pdevs {
        namespace mpi {

            template<class Time>
            class LogicalProcessor {
                typedef LogicalProcessor<Time> type;

            public:
                LogicalProcessor(common::Model<Time>* model, int rank, int parent)
                        :
                        _rank(rank),
                        _parent(parent),
                        _model(model) { }

                virtual ~LogicalProcessor() { }

                void dispatch_events_to_parent(common::Node<Time> node,
                        const common::Value& content,
                        typename Time::type t)
                {
                    (void) t;

                    _output_bag.push_back(
                            common::ExternalEvent<Time>(node, content));
                }

                void loop()
                {
                    typename Time::type t;

                    for (;;) {
                        boost::mpi::status msg = _communicator.probe();

                        switch (msg.tag()) {
                        case finish_send_tag:
                            return;
                        case output_send_tag: {
                            _communicator.recv(_parent, output_send_tag, t);
                            _model->output(t);
                            _communicator.send(_parent, output_receive_tag,
                                    _output_bag);
                            _output_bag.clear();
                            break;
                        }
                        case post_event_send_tag: {
                            common::ExternalEvent<Time> event;

                            _communicator.recv(_parent, post_event_send_tag, t);
                            _communicator.recv(_parent, post_event_send_tag, event);
                            _model->post_event(t, event);
                            break;
                        }
                        case start_send_tag:
                            _communicator.recv(_parent, start_send_tag, t);
                            _communicator.send(_parent, tn_receive_tag,
                                    _model->start(t));
                            break;
                        case transition_send_tag:
                            _communicator.recv(_parent, transition_send_tag, t);
                            _communicator.send(_parent, tn_receive_tag,
                                    _model->transition(t));
                            break;
                        default:
                            throw std::runtime_error("Invalid tag");
                        }
                    }
                };

            private:
                int _rank;
                int _parent;
                boost::mpi::communicator _communicator;
                common::Model<Time>* _model;
                common::Bag<Time> _output_bag;
            };

        }
    }
} // namespace artis pdevs mpi

#endif