PhutilEventEngine.php
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PhutilEventEngine.php
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	<?php

	final class PhutilEventEngine extends Phobject {

	private static $instance;

	private $listeners = array();

	private function __construct() {
	// <empty>
	}

	public static function getInstance() {
	if (!self::$instance) {
	self::$instance = new PhutilEventEngine();
	}
	return self::$instance;
	}

	public function addListener(PhutilEventListener $listener, $type) {
	$this->listeners[$type][] = $listener;
	return $this;
	}

	/**
	* Get all the objects currently listening to any event.
	*/
	public function getAllListeners() {
	$listeners = array_mergev($this->listeners);
	$listeners = mpull($listeners, null, 'getListenerID');
	return $listeners;
	}

	public static function dispatchEvent(PhutilEvent $event) {
	$instance = self::getInstance();

	$listeners = idx($instance->listeners, $event->getType(), array());
	$global_listeners = idx(
	$instance->listeners,
	PhutilEventType::TYPE_ALL,
	array());

	// Merge and deduplicate listeners (we want to send the event to each
	// listener only once, even if it satisfies multiple criteria for the
	// event).
	$listeners = array_merge($listeners, $global_listeners);
	$listeners = mpull($listeners, null, 'getListenerID');

	$profiler = PhutilServiceProfiler::getInstance();
	$profiler_id = $profiler->beginServiceCall(
	array(
	'type' => 'event',
	'kind' => $event->getType(),
	'count' => count($listeners),
	));

	$caught = null;
	try {
	foreach ($listeners as $listener) {
	if ($event->isStopped()) {
	// Do this first so if someone tries to dispatch a stopped event it
	// doesn't go anywhere. Silly but less surprising.
	break;
	}
	$listener->handleEvent($event);
	}
	} catch (Exception $ex) {
	$profiler->endServiceCall($profiler_id, array());
	throw $ex;
	}

	$profiler->endServiceCall($profiler_id, array());
	}

	}

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