💿🐜 Antkeeper source code
https://antkeeper.com
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138 lines
3.6 KiB
138 lines
3.6 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_EVENT_DISPATCHER_HPP
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#define ANTKEEPER_EVENT_DISPATCHER_HPP
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#include "event.hpp"
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#include "event-handler.hpp"
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#include <cstdlib>
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#include <list>
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#include <map>
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/**
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* Queues events and dispatches them to event handlers.
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*/
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class event_dispatcher
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{
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public:
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/// Creates an event dispatcher
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event_dispatcher();
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/// Destroys an event dispatcher
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~event_dispatcher();
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/**
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* Processes all pending subscriptions and unsubscriptions, dispatches queued events, then dispatches due scheduled events.
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*
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* @param time The current time.
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*/
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void update(double time);
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/**
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* Subscribes an event handler to event dispatches.
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*
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* @param handler Handler to subscribe.
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*/
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template <typename T>
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void subscribe(event_handler<T>* handler);
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/**
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* Unsubscribes an event handler from event dispatches.
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*
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* @param handler Handler to unsubscribe.
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*/
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template <typename T>
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void unsubscribe(event_handler<T>* handler);
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/**
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* Adds an event to the queue.
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*
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* @param event Event to queue.
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*/
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void queue(const event_base& event);
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/**
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* Schedules an event to be dispatched at a specific time.
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*
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* @param event Event to schedule.
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* @param time Time that the event should be dispatched.
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*/
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void schedule(const event_base& event, double time);
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/**
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* Dispatches a single event.
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*
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* @param event Event to dispatch.
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*/
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void dispatch(const event_base& event);
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/**
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* Dispatches all events in the queue.
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*/
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void flush();
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/// Removes all queued and scheduled events from the queue without notifying handlers.
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void clear();
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private:
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std::list<std::tuple<std::size_t, event_handler_base*>> to_subscribe;
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std::list<std::tuple<std::size_t, event_handler_base*>> to_unsubscribe;
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std::map<std::size_t, std::list<event_handler_base*>> handler_map;
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std::list<event_base*> queued_events;
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std::multimap<double, event_base*> scheduled_events;
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};
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template <typename T>
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void event_dispatcher::subscribe(event_handler<T>* handler)
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{
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to_subscribe.push_back(std::make_tuple(handler->get_handled_event_type_id(), handler));
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}
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template <typename T>
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void event_dispatcher::unsubscribe(event_handler<T>* handler)
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{
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to_unsubscribe.push_back(std::make_tuple(handler->get_handled_event_type_id(), handler));
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}
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inline void event_dispatcher::queue(const event_base& event)
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{
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queued_events.push_back(event.clone());
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}
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inline void event_dispatcher::schedule(const event_base& event, double time)
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{
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scheduled_events.insert(std::pair<double, event_base*>(time, event.clone()));
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}
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inline void event_dispatcher::dispatch(const event_base& event)
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{
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// Get list of handlers for this type of event
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const std::list<event_handler_base*>& handlers = handler_map[event.get_event_type_id()];
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// For each handler
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for (auto handler = handlers.begin(); handler != handlers.end(); ++handler)
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{
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// Pass event to the handler
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(*handler)->route_event(event);
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}
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}
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#endif // ANTKEEPER_EVENT_DISPATCHER_HPP
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