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phab/src/infrastructure/events/engine/PhabricatorEventEngine.php
522e5b47795ffeature/better-testing

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PhabricatorEventEngine.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
class PhabricatorEventEngine {
private static $instance;
private $listeners = array();
private function __construct() {
// <empty>
}
public static function initialize() {
self::$instance = new PhabricatorEventEngine();
// Instantiate and register custom event listeners so they can react to
// events.
$listeners = PhabricatorEnv::getEnvConfig('events.listeners');
foreach ($listeners as $listener) {
id(new $listener())->register();
}
}
public static function getInstance() {
if (!self::$instance) {
throw new Exception("Event engine has not been initialized!");
}
return self::$instance;
}
public function addListener(
PhabricatorEventListener $listener,
$type) {
$this->listeners[$type][] = $listener;
return $this;
}
public static function dispatchEvent(PhabricatorEvent $event) {
$instance = self::getInstance();
$listeners = idx($instance->listeners, $event->getType(), array());
foreach ($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);
}
}
}
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