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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2020 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

namespace Joomla\CMS\Application;

use Joomla\Event\DispatcherAwareInterface;
use Joomla\Event\DispatcherInterface;
use Joomla\Event\Event;

/**
 * Interface defining application that can trigger Joomla 3.x style events
 *
 * @since       4.0.0
 * @deprecated  5.0   This interface will be removed as the Joomla 3.x compatibility layer will be removed
 */
interface EventAwareInterface extends DispatcherAwareInterface
{
	/**
	 * Get the event dispatcher.
	 *
	 * @return  DispatcherInterface
	 *
	 * @since   4.0.0
	 * @throws  \UnexpectedValueException May be thrown if the dispatcher has not been set.
	 */
	public function getDispatcher();

	/**
	 * Calls all handlers associated with an event group.
	 *
	 * This is a legacy method, implementing old-style (Joomla! 3.x) plugin calls. It's best to go directly through the
	 * Dispatcher and handle the returned EventInterface object instead of going through this method. This method is
	 * deprecated and will be removed in Joomla! 5.x.
	 *
	 * This method will only return the 'result' argument of the event
	 *
	 * @param   string       $eventName  The event name.
	 * @param   array|Event  $args       An array of arguments or an Event object (optional).
	 *
	 * @return  array  An array of results from each function call. Note this will be an empty array if no dispatcher is set.
	 *
	 * @since       4.0.0
	 * @throws      \InvalidArgumentException
	 * @deprecated  5.0
	 */
	public function triggerEvent($eventName, $args = []);
}