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aka_event_handler_manager.hh
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/**
* @file aka_event_handler_manager.hh
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Fri Jun 18 2010
* @date last modification: Tue Feb 09 2021
*
* @brief Base of Event Handler classes
*
*
* @section LICENSE
*
* Copyright (©) 2010-2021 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_AKA_EVENT_HANDLER_MANAGER_HH_
#define AKANTU_AKA_EVENT_HANDLER_MANAGER_HH_
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
/* -------------------------------------------------------------------------- */
#include <algorithm>
#include <list>
/* -------------------------------------------------------------------------- */
namespace akantu {
template <class EventHandler> class EventHandlerManager {
private:
using priority_value = std::pair<EventHandlerPriority, EventHandler *>;
using priority_list = std::list<priority_value>;
struct KeyComp {
bool operator()(const priority_value & a, const priority_value & b) const {
return (a.first < b.first);
}
bool operator()(const priority_value & a, UInt b) const {
return (a.first < b);
}
};
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
virtual ~EventHandlerManager() = default;
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
/// register a new EventHandler to the Manager. The register object
/// will then be informed about the events the manager observes.
void registerEventHandler(EventHandler & event_handler,
EventHandlerPriority priority = _ehp_highest) {
auto it = this->searchEventHandler(event_handler);
if (it != this->event_handlers.end()) {
AKANTU_EXCEPTION("This event handler was already registered (priority: "
<< priority << ")");
}
auto pos =
std::lower_bound(this->event_handlers.begin(),
this->event_handlers.end(), priority, KeyComp());
this->event_handlers.insert(pos, std::make_pair(priority, &event_handler));
}
/// unregister a EventHandler object. This object will not be
/// notified anymore about the events this manager observes.
void unregisterEventHandler(EventHandler & event_handler) {
auto it = this->searchEventHandler(event_handler);
if (it == this->event_handlers.end()) {
AKANTU_EXCEPTION("This event handler is not registered");
}
this->event_handlers.erase(it);
}
/// Notify all the registered EventHandlers about the event that just occured.
template <class Event> void sendEvent(const Event & event) {
for (auto & pair : this->event_handlers) {
pair.second->sendEvent(event);
}
}
private:
typename priority_list::iterator searchEventHandler(EventHandler & handler) {
auto it = this->event_handlers.begin();
auto end = this->event_handlers.end();
for (; it != end && it->second != &handler; ++it) {
;
}
return it;
}
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
private:
/// list of the event handlers
priority_list event_handlers;
};
} // namespace akantu
#endif /* AKANTU_AKA_EVENT_HANDLER_MANAGER_HH_ */

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