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GlobalEventManager.php
001 <?php
002 /**
003 * Zend Framework (http://framework.zend.com/)
004 *
005 * @link http://github.com/zendframework/zf2 for the canonical source repository
006 * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
007 * @license http://framework.zend.com/license/new-bsd New BSD License
008 */
009
010 namespace Zend\EventManager;
011
012 use Zend\Stdlib\CallbackHandler;
013 use Zend\Stdlib\PriorityQueue;
014
015 /**
016 * Event manager: notification system
017 *
018 * Use the EventManager when you want to create a per-instance notification
019 * system for your objects.
020 */
021 class GlobalEventManager
022 {
023 /**
024 * @var EventManagerInterface
025 */
026 protected static $events;
027
028 /**
029 * Set the event collection on which this will operate
030 *
031 * @param null|EventManagerInterface $events
032 * @return void
033 */
034 public static function setEventCollection(EventManagerInterface $events = null)
035 {
036 static::$events = $events;
037 }
038
039 /**
040 * Get event collection on which this operates
041 *
042 * @return EventManagerInterface
043 */
044 public static function getEventCollection()
045 {
046 if (null === static::$events) {
047 static::setEventCollection(new EventManager());
048 }
049 return static::$events;
050 }
051
052 /**
053 * Trigger an event
054 *
055 * @param string $event
056 * @param object|string $context
057 * @param array|object $argv
058 * @param null|callable $callback
059 * @return ResponseCollection
060 */
061 public static function trigger($event, $context, $argv = array(), $callback = null)
062 {
063 return static::getEventCollection()->trigger($event, $context, $argv, $callback);
064 }
065
066 /**
067 * Trigger listeners until return value of one causes a callback to evaluate
068 * to true.
069 *
070 * @param string $event
071 * @param string|object $context
072 * @param array|object $argv
073 * @param callable $callback
074 * @return ResponseCollection
075 * @deprecated Please use trigger()
076 */
077 public static function triggerUntil($event, $context, $argv, $callback)
078 {
079 trigger_error(
080 'This method is deprecated and will be removed in the future. Please use trigger() instead.',
081 E_USER_DEPRECATED
082 );
083 return static::trigger($event, $context, $argv, $callback);
084 }
085
086 /**
087 * Attach a listener to an event
088 *
089 * @param string $event
090 * @param callable $callback
091 * @param int $priority
092 * @return CallbackHandler
093 */
094 public static function attach($event, $callback, $priority = 1)
095 {
096 return static::getEventCollection()->attach($event, $callback, $priority);
097 }
098
099 /**
100 * Detach a callback from a listener
101 *
102 * @param CallbackHandler $listener
103 * @return bool
104 */
105 public static function detach(CallbackHandler $listener)
106 {
107 return static::getEventCollection()->detach($listener);
108 }
109
110 /**
111 * Retrieve list of events this object manages
112 *
113 * @return array
114 */
115 public static function getEvents()
116 {
117 return static::getEventCollection()->getEvents();
118 }
119
120 /**
121 * Retrieve all listeners for a given event
122 *
123 * @param string $event
124 * @return PriorityQueue|array
125 */
126 public static function getListeners($event)
127 {
128 return static::getEventCollection()->getListeners($event);
129 }
130
131 /**
132 * Clear all listeners for a given event
133 *
134 * @param string $event
135 * @return void
136 */
137 public static function clearListeners($event)
138 {
139 static::getEventCollection()->clearListeners($event);
140 }
141 }
142