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) 2013-2022 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

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

#include <boost/mpi/communicator.hpp>

namespace artis {
namespace pdevs {
namespace mpi {

template<typename 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