79 lines
2.0 KiB
PHP
79 lines
2.0 KiB
PHP
<?php
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/**
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* Copyright 2014 Openstack Foundation
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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/**
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* Class PublisherSubscriberManager
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*/
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final class PublisherSubscriberManager {
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/**
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* @var PublisherSubscriberManager
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*/
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private static $instance;
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private $events = array(); // all subscriptions
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private function __construct(){}
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private function __clone(){}
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/**
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* @return PublisherSubscriberManager
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*/
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public static function getInstance(){
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if(!is_object(self::$instance)){
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self::$instance = new PublisherSubscriberManager();
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}
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return self::$instance;
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}
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/**
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* @param string $event_name
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* @param $callback
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*/
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public function subscribe($event_name, $callback){
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// Make sure the subscription isn't null
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if ( empty( $this->events[ $event_name ] ) )
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$this->events[ $event_name ] = array();
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// push the $callback onto the subscription stack
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array_push( $this->events[ $event_name ], $callback );
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}
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/**
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* @param string$event_name
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* @param array $params
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* @return bool
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*/
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public function publish( $event_name, array $params = array())
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{
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// Check to see if the subscribe isn't null
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if ( empty($this->events[$event_name] ) )
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return false;
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// Loop through all the events and call them
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foreach ( $this->events[$event_name] as $event )
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{
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if ( is_callable( $event ) )
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call_user_func_array( $event, $params );
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}
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}
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/**
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* @param string $event_name
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*/
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public function unsubscribe($event_name){
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if ( !empty( $this->events[$event_name] ) )
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unset($this->events[$event_name] );
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}
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}
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