EventListenerInterface.php

<?php
declare(strict_types=1);

/**
 * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 * @link          https://cakephp.org CakePHP(tm) Project
 * @since         2.1.0
 * @license       https://opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Event;

/**
 * Objects implementing this interface should declare the `implementedEvents()` method
 * to notify the event manager what methods should be called when an event is triggered.
 */
interface EventListenerInterface
{
    /**
     * Returns a list of events this object is implementing. When the class is registered
     * in an event manager, each individual method will be associated with the respective event.
     *
     * ### Example:
     *
     * ```
     *  public function implementedEvents()
     *  {
     *      return [
     *          'Order.complete' => 'sendEmail',
     *          'Article.afterBuy' => 'decrementInventory',
     *          'User.onRegister' => ['callable' => 'logRegistration', 'priority' => 20, 'passParams' => true]
     *      ];
     *  }
     * ```
     *
     * @return array<string, mixed> Associative array or event key names pointing to the function
     * that should be called in the object when the respective event is fired
     */
    public function implementedEvents(): array;
}