openstackweb/openstack/code/utils/PublisherSubscriberManager.php
2014-10-31 16:59:18 -03:00

79 lines
2.0 KiB
PHP

<?php
/**
* Copyright 2014 Openstack Foundation
* 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 PublisherSubscriberManager
*/
final class PublisherSubscriberManager {
/**
* @var PublisherSubscriberManager
*/
private static $instance;
private $events = array(); // all subscriptions
private function __construct(){}
private function __clone(){}
/**
* @return PublisherSubscriberManager
*/
public static function getInstance(){
if(!is_object(self::$instance)){
self::$instance = new PublisherSubscriberManager();
}
return self::$instance;
}
/**
* @param string $event_name
* @param $callback
*/
public function subscribe($event_name, $callback){
// Make sure the subscription isn't null
if ( empty( $this->events[ $event_name ] ) )
$this->events[ $event_name ] = array();
// push the $callback onto the subscription stack
array_push( $this->events[ $event_name ], $callback );
}
/**
* @param string$event_name
* @param array $params
* @return bool
*/
public function publish( $event_name, array $params = array())
{
// Check to see if the subscribe isn't null
if ( empty($this->events[$event_name] ) )
return false;
// Loop through all the events and call them
foreach ( $this->events[$event_name] as $event )
{
if ( is_callable( $event ) )
call_user_func_array( $event, $params );
}
}
/**
* @param string $event_name
*/
public function unsubscribe($event_name){
if ( !empty( $this->events[$event_name] ) )
unset($this->events[$event_name] );
}
}