4 * This file is part of the Symfony package.
6 * (c) Fabien Potencier <fabien@symfony.com>
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
12 namespace Symfony\Component\EventDispatcher;
15 * The EventDispatcherInterface is the central point of Symfony's event listener system.
17 * Listeners are registered on the manager and events are dispatched through the
20 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
21 * @author Jonathan Wage <jonwage@gmail.com>
22 * @author Roman Borschel <roman@code-factory.org>
23 * @author Bernhard Schussek <bschussek@gmail.com>
24 * @author Fabien Potencier <fabien@symfony.com>
25 * @author Jordi Boggiano <j.boggiano@seld.be>
26 * @author Jordan Alliot <jordan.alliot@gmail.com>
28 class EventDispatcher implements EventDispatcherInterface
30 private $listeners = array();
31 private $sorted = array();
36 public function dispatch($eventName, Event $event = null)
38 if (null === $event) {
42 if ($listeners = $this->getListeners($eventName)) {
43 $this->doDispatch($listeners, $eventName, $event);
52 public function getListeners($eventName = null)
54 if (null !== $eventName) {
55 if (!isset($this->listeners[$eventName])) {
59 if (!isset($this->sorted[$eventName])) {
60 $this->sortListeners($eventName);
63 return $this->sorted[$eventName];
66 foreach ($this->listeners as $eventName => $eventListeners) {
67 if (!isset($this->sorted[$eventName])) {
68 $this->sortListeners($eventName);
72 return array_filter($this->sorted);
78 public function getListenerPriority($eventName, $listener)
80 if (!isset($this->listeners[$eventName])) {
84 foreach ($this->listeners[$eventName] as $priority => $listeners) {
85 if (false !== in_array($listener, $listeners, true)) {
94 public function hasListeners($eventName = null)
96 return (bool) $this->getListeners($eventName);
102 public function addListener($eventName, $listener, $priority = 0)
104 $this->listeners[$eventName][$priority][] = $listener;
105 unset($this->sorted[$eventName]);
111 public function removeListener($eventName, $listener)
113 if (!isset($this->listeners[$eventName])) {
117 foreach ($this->listeners[$eventName] as $priority => $listeners) {
118 if (false !== ($key = array_search($listener, $listeners, true))) {
119 unset($this->listeners[$eventName][$priority][$key], $this->sorted[$eventName]);
127 public function addSubscriber(EventSubscriberInterface $subscriber)
129 foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
130 if (is_string($params)) {
131 $this->addListener($eventName, array($subscriber, $params));
132 } elseif (is_string($params[0])) {
133 $this->addListener($eventName, array($subscriber, $params[0]), isset($params[1]) ? $params[1] : 0);
135 foreach ($params as $listener) {
136 $this->addListener($eventName, array($subscriber, $listener[0]), isset($listener[1]) ? $listener[1] : 0);
145 public function removeSubscriber(EventSubscriberInterface $subscriber)
147 foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
148 if (is_array($params) && is_array($params[0])) {
149 foreach ($params as $listener) {
150 $this->removeListener($eventName, array($subscriber, $listener[0]));
153 $this->removeListener($eventName, array($subscriber, is_string($params) ? $params : $params[0]));
159 * Triggers the listeners of an event.
161 * This method can be overridden to add functionality that is executed
164 * @param callable[] $listeners The event listeners
165 * @param string $eventName The name of the event to dispatch
166 * @param Event $event The event object to pass to the event handlers/listeners
168 protected function doDispatch($listeners, $eventName, Event $event)
170 foreach ($listeners as $listener) {
171 if ($event->isPropagationStopped()) {
174 call_user_func($listener, $event, $eventName, $this);
179 * Sorts the internal list of listeners for the given event by priority.
181 * @param string $eventName The name of the event
183 private function sortListeners($eventName)
185 krsort($this->listeners[$eventName]);
186 $this->sorted[$eventName] = call_user_func_array('array_merge', $this->listeners[$eventName]);