GlobalContext.cpp

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/*
 * Copyright (C) 2020-2022 The ESPResSo project
 *
 * This file is part of ESPResSo.
 *
 * ESPResSo 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.
 *
 * ESPResSo 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/>.
 */
 
/** @file
 *
 *  Infrastructure to synchronize objects created on the head node with
 *  their corresponding remote copies. Methods of script interface
 *  classes may throw exceptions of type @ref ScriptInterface::Exception.
 *  These exceptions will halt the flow of the program on the head node.
 *  The same exceptions will be thrown in the remote copies but will
 *  be silenced, since they are redundant. Other types of exceptions
 *  are not silenced.
 *
 *  Implementation of @ref GlobalContext.hpp.
 */
 
#include "GlobalContext.hpp"
#include "Exception.hpp"
#include "ObjectHandle.hpp"
#include "packed_variant.hpp"
 
#include <utils/serialization/pack.hpp>
 
#include <cassert>
#include <stdexcept>
#include <string>
#include <utility>
 
namespace ScriptInterface {
void GlobalContext::make_handle(ObjectId id, const std::string &name,
                                const PackedMap &parameters) {
  try {
    ObjectRef so = m_node_local_context->make_shared(
        name, unpack(parameters, m_local_objects));
 
    m_local_objects[id] = std::move(so);
  } catch (Exception const &) { // NOLINT(bugprone-empty-catch)
  }
}
 
void GlobalContext::remote_make_handle(ObjectId id, const std::string &name,
                                       const VariantMap &parameters) {
  cb_make_handle(id, name, pack(parameters));
}
 
void GlobalContext::set_parameter(ObjectId id, std::string const &name,
                                  PackedVariant const &value) {
  try {
    m_local_objects.at(id)->set_parameter(name, unpack(value, m_local_objects));
  } catch (Exception const &) { // NOLINT(bugprone-empty-catch)
  }
}
 
void GlobalContext::notify_set_parameter(const ObjectHandle *o,
                                         std::string const &name,
                                         Variant const &value) {
  cb_set_parameter(ObjectId(o), name, pack(value));
}
 
void GlobalContext::call_method(ObjectId id, std::string const &name,
                                PackedMap const &arguments) {
  try {
    m_local_objects.at(id)->call_method(name,
                                        unpack(arguments, m_local_objects));
  } catch (Exception const &) { // NOLINT(bugprone-empty-catch)
  }
}
 
void GlobalContext::notify_call_method(const ObjectHandle *o,
                                       std::string const &name,
                                       VariantMap const &arguments) {
  cb_call_method(ObjectId(o), name, pack(arguments));
}
 
std::shared_ptr<ObjectHandle>
GlobalContext::make_shared(std::string const &name,
                           const VariantMap &parameters) {
  assert(is_head_node());
  auto sp = m_node_local_context->factory().make(name);
  set_context(sp.get());
 
  auto const id = ObjectId(sp.get());
  remote_make_handle(id, name, parameters);
 
  sp->construct(parameters);
 
  return {sp.release(),
          /* Custom deleter, we keep the corresponding global context,
           * as well as the original deleter for the object. */
          [global_context = this, deleter = sp.get_deleter()](ObjectHandle *o) {
            /* Tell the other nodes before invoking the destructor, this is
             * required
             * to have synchronous destructors, which is needed by some client
             * code. */
            global_context->cb_delete_handle(ObjectId(o));
 
            /* Locally destroy the object. */
            deleter(o);
          }};
}
 
std::string_view GlobalContext::name(const ObjectHandle *o) const {
  assert(o);
 
  return m_node_local_context->factory().type_name(*o);
}
} // namespace ScriptInterface