atelierspierrot/library

<?php
/**
 * This file is part of the Library package.
 *
 * Copyleft (ↄ) 2013-2015 Pierre Cassat <me@e-piwi.fr> and contributors
 * 
 * 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/>.
 *
 * The source code of this package is available online at 
 * <http://github.com/atelierspierrot/library>.
 */

namespace Library\Event;

/**
 * Interface EventManagerInterface
 */
interface EventManagerInterface
{

    /**
     * @param $event_name
     * @return bool
     */
    public function hasListeners($event_name);

    /**
     * @param $event_name
     * @return array|null
     */
    public function getListeners($event_name);

    /**
     * @param $event
     * @param $callback
     */
    public function addListener($event, $callback);

    /**
     * @param $event
     * @param $callback
     */
    public function removeListener($event, $callback);

    /**
     * @param EventSubscriberInterface $subscriber
     */
    public function addSubscriber(EventSubscriberInterface $subscriber);

    /**
     * @param EventSubscriberInterface $subscriber
     */
    public function removeSubscriber(EventSubscriberInterface $subscriber);

    /**
     * @param string $event_name
     * @param ObservableInterface $subject
     * @return mixed
     */
    public function triggerEvent($event_name, ObservableInterface $subject);

}

// Endfile