EventHandler class

gistfile1.php

<?php
require_once 'EventPriorityQueue.php';

/**
 * Class EventHandler
 */
class EventHandler {
	/**
	 * Holds all events in an array of EventPriorityQueues
	 *
	 * @var EventPriorityQueue[]
	 */
	private static $events = [];

	/**
	 * Add an Event to a specific handle
	 *
	 * @param string         $handle
	 * @param callable|Event $event
	 * @param int            $priority
	 *
	 * @throws Exception    If the type of the $event is not callable and not an Event, throws an Exception
	 */
	public static function addEvent($handle, $event, $priority = 10) {
		if ( ! array_key_exists($handle, self::$events)) {
			self::$events[$handle] = new EventPriorityQueue();
		}

		if ($event instanceof Event) {
			self::$events[$handle]->insert($event, $priority);
		} elseif (is_callable($event)) {
			self::$events[$handle]->insert(new Event($event), $priority);
		} else {
			throw new Exception('Type of $event was unknown, it was: ' . gettype($event));
		}
	}

	/**
	 * Execute all events for the specific handle
	 *
	 * @param string $handle
	 */
	public static function executeEvents($handle) {
		if (array_key_exists($handle, self::$events)) {
			/**
			 * @var $event Event
			 */
			foreach (self::$events[$handle] as $event) {
				$event->run();
			}

			// Remove the handle from the array of events
			unset(self::$events[$handle]);
		}
	}
}