Add EventManagerInterface.

src/Event/EventManager.php

@@ -22,7 +22,7 @@
  * can create multiple instances of this object to manage local events or keep a single instance
  * and pass it around to manage all events in your app.
  */
-class EventManager
+class EventManager implements EventManagerInterface
 {
 
     /**

src/Event/EventManagerInterface.php

@@ -0,0 +1,109 @@
+<?php
+/**
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://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. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         3.6.0
+ * @license       http://www.opensource.org/licenses/mit-license.php MIT License
+ */
+namespace Cake\Event;
+
+interface EventManagerInterface
+{
+
+    /**
+     * Adds a new listener to an event.
+     *
+     * A variadic interface to add listeners that emulates jQuery.on().
+     *
+     * Binding an EventListenerInterface:
+     *
+     * ```
+     * $eventManager->on($listener);
+     * ```
+     *
+     * Binding with no options:
+     *
+     * ```
+     * $eventManager->on('Model.beforeSave', $callable);
+     * ```
+     *
+     * Binding with options:
+     *
+     * ```
+     * $eventManager->on('Model.beforeSave', ['priority' => 90], $callable);
+     * ```
+     *
+     * @param string|\Cake\Event\EventListenerInterface|null $eventKey The event unique identifier name
+     * with which the callback will be associated. If $eventKey is an instance of
+     * Cake\Event\EventListenerInterface its events will be bound using the `implementedEvents` methods.
+     *
+     * @param array|callable $options Either an array of options or the callable you wish to
+     * bind to $eventKey. If an array of options, the `priority` key can be used to define the order.
+     * Priorities are treated as queues. Lower values are called before higher ones, and multiple attachments
+     * added to the same priority queue will be treated in the order of insertion.
+     *
+     * @param callable|null $callable The callable function you want invoked.
+     *
+     * @return $this
+     * @throws \InvalidArgumentException When event key is missing or callable is not an
+     *   instance of Cake\Event\EventListenerInterface.
+     */
+    public function on($eventKey = null, $options = [], $callable = null);
+
+    /**
+     * Remove a listener from the active listeners.
+     *
+     * Remove a EventListenerInterface entirely:
+     *
+     * ```
+     * $manager->off($listener);
+     * ```
+     *
+     * Remove all listeners for a given event:
+     *
+     * ```
+     * $manager->off('My.event');
+     * ```
+     *
+     * Remove a specific listener:
+     *
+     * ```
+     * $manager->off('My.event', $callback);
+     * ```
+     *
+     * Remove a callback from all events:
+     *
+     * ```
+     * $manager->off($callback);
+     * ```
+     *
+     * @param string|\Cake\Event\EventListenerInterface $eventKey The event unique identifier name
+     *   with which the callback has been associated, or the $listener you want to remove.
+     * @param callable|null $callable The callback you want to detach.
+     * @return $this
+     */
+    public function off($eventKey, $callable = null);
+
+    /**
+     * Dispatches a new event to all configured listeners
+     *
+     * @param string|\Cake\Event\EventInterface $event the event key name or instance of Event
+     * @return \Cake\Event\Event
+     * @triggers $event
+     */
+    public function dispatch($event);
+
+    /**
+     * Returns a list of all listeners for an eventKey in the order they should be called
+     *
+     * @param string $eventKey Event key.
+     * @return array
+     */
+    public function listeners($eventKey);
+}