PhutilEventListener.php
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PhutilEventListener.php
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	<?php

	abstract class PhutilEventListener extends Phobject {

	private $listenerID;
	private static $nextListenerID = 1;

	final public function __construct() {
	// <empty>
	}

	abstract public function register();
	abstract public function handleEvent(PhutilEvent $event);

	final public function listen($type) {
	$engine = PhutilEventEngine::getInstance();
	$engine->addListener($this, $type);
	}


	/**
	* Return a scalar ID unique to this listener. This is used to deduplicate
	* listeners which match events on multiple rules, so they are invoked only
	* once.
	*
	* @return int A scalar unique to this object instance.
	*/
	final public function getListenerID() {
	if (!$this->listenerID) {
	$this->listenerID = self::$nextListenerID;
	self::$nextListenerID++;
	}
	return $this->listenerID;
	}


	}