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PhabricatorEventEngine.php
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			<?php

			final class PhabricatorEventEngine extends Phobject {

			public static function initialize() {
			// NOTE: If any of this fails, we just log it and move on. It's important
			// to try to make it through here because users may have difficulty fixing
			// fix the errors if we don't: for example, if we fatal here a user may not
			// be able to run `bin/config` in order to remove an invalid listener.

			// Load automatic listeners.
			$listeners = id(new PhutilClassMapQuery())
			->setAncestorClass('PhabricatorAutoEventListener')
			->execute();

			// Load configured listeners.
			$config_listeners = PhabricatorEnv::getEnvConfig('events.listeners');
			foreach ($config_listeners as $listener_class) {
			try {
			$listeners[] = newv($listener_class, array());
			} catch (Exception $ex) {
			phlog($ex);
			}
			}

			// Add built-in listeners.
			$listeners[] = new DarkConsoleEventPluginAPI();

			// Add application listeners.
			$applications = PhabricatorApplication::getAllInstalledApplications();
			foreach ($applications as $application) {
			$app_listeners = $application->getEventListeners();
			foreach ($app_listeners as $listener) {
			$listener->setApplication($application);
			$listeners[] = $listener;
			}
			}

			// Now, register all of the listeners.
			foreach ($listeners as $listener) {
			try {
			$listener->register();
			} catch (Exception $ex) {
			phlog($ex);
			}
			}
			}

			}