<?php
/**
 * Interface for subscribers
 *
 * @package RocketLazyload
 */

namespace RocketLazyLoadPlugin\EventManagement;

/**
 * A Subscriber knows what specific WordPress events it wants to listen to.
 *
 * When an EventManager adds a Subscriber, it gets all the WordPress events that
 * it wants to listen to. It then adds the subscriber as a listener for each of them.
 *
 * @author Carl Alexander <contact@carlalexander.ca>
 */
interface SubscriberInterface
{
    /**
     * Returns an array of events that this subscriber wants to listen to.
     *
     * The array key is the event name. The value can be:
     *
     *  * The method name
     *  * An array with the method name and priority
     *  * An array with the method name, priority and number of accepted arguments
     *
     * For instance:
     *
     *  * array('hook_name' => 'method_name')
     *  * array('hook_name' => array('method_name', $priority))
     *  * array('hook_name' => array('method_name', $priority, $accepted_args))
     *  * array('hook_name' => array(array('method_name_1', $priority_1, $accepted_args_1)), array('method_name_2', $priority_2, $accepted_args_2)))
     *
     * @return array
     */
    public function getSubscribedEvents();
}