PhutilEventListener.php
31110f222572production

PhutilEventListener.php
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			<?php

			/**
			* @stable
			*/
			abstract class PhutilEventListener {

			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;
			}


			}