Differential D20980 Diff 49996 src/events/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;
				}


				}