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EventDispatcher.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\EventDispatcher;
013
014 /**
015 * The EventDispatcherInterface is the central point of Symfony's event listener system.
016 *
017 * Listeners are registered on the manager and events are dispatched through the
018 * manager.
019 *
020 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
021 * @author Jonathan Wage <jonwage@gmail.com>
022 * @author Roman Borschel <roman@code-factory.org>
023 * @author Bernhard Schussek <bschussek@gmail.com>
024 * @author Fabien Potencier <fabien@symfony.com>
025 * @author Jordi Boggiano <j.boggiano@seld.be>
026 * @author Jordan Alliot <jordan.alliot@gmail.com>
027 * @author Nicolas Grekas <p@tchwork.com>
028 */
029 class EventDispatcher implements EventDispatcherInterface
030 {
031 private $listeners = [];
032 private $sorted = [];
033
034 /**
035 * {@inheritdoc}
036 */
037 public function dispatch($eventName, Event $event = null)
038 {
039 if (null === $event) {
040 $event = new Event();
041 }
042
043 if ($listeners = $this->getListeners($eventName)) {
044 $this->doDispatch($listeners, $eventName, $event);
045 }
046
047 return $event;
048 }
049
050 /**
051 * {@inheritdoc}
052 */
053 public function getListeners($eventName = null)
054 {
055 if (null !== $eventName) {
056 if (empty($this->listeners[$eventName])) {
057 return [];
058 }
059
060 if (!isset($this->sorted[$eventName])) {
061 $this->sortListeners($eventName);
062 }
063
064 return $this->sorted[$eventName];
065 }
066
067 foreach ($this->listeners as $eventName => $eventListeners) {
068 if (!isset($this->sorted[$eventName])) {
069 $this->sortListeners($eventName);
070 }
071 }
072
073 return array_filter($this->sorted);
074 }
075
076 /**
077 * {@inheritdoc}
078 */
079 public function getListenerPriority($eventName, $listener)
080 {
081 if (empty($this->listeners[$eventName])) {
082 return null;
083 }
084
085 if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
086 $listener[0] = $listener[0]();
087 }
088
089 foreach ($this->listeners[$eventName] as $priority => $listeners) {
090 foreach ($listeners as $k => $v) {
091 if ($v !== $listener && \is_array($v) && isset($v[0]) && $v[0] instanceof \Closure) {
092 $v[0] = $v[0]();
093 $this->listeners[$eventName][$priority][$k] = $v;
094 }
095 if ($v === $listener) {
096 return $priority;
097 }
098 }
099 }
100
101 return null;
102 }
103
104 /**
105 * {@inheritdoc}
106 */
107 public function hasListeners($eventName = null)
108 {
109 if (null !== $eventName) {
110 return !empty($this->listeners[$eventName]);
111 }
112
113 foreach ($this->listeners as $eventListeners) {
114 if ($eventListeners) {
115 return true;
116 }
117 }
118
119 return false;
120 }
121
122 /**
123 * {@inheritdoc}
124 */
125 public function addListener($eventName, $listener, $priority = 0)
126 {
127 $this->listeners[$eventName][$priority][] = $listener;
128 unset($this->sorted[$eventName]);
129 }
130
131 /**
132 * {@inheritdoc}
133 */
134 public function removeListener($eventName, $listener)
135 {
136 if (empty($this->listeners[$eventName])) {
137 return;
138 }
139
140 if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
141 $listener[0] = $listener[0]();
142 }
143
144 foreach ($this->listeners[$eventName] as $priority => $listeners) {
145 foreach ($listeners as $k => $v) {
146 if ($v !== $listener && \is_array($v) && isset($v[0]) && $v[0] instanceof \Closure) {
147 $v[0] = $v[0]();
148 }
149 if ($v === $listener) {
150 unset($listeners[$k], $this->sorted[$eventName]);
151 } else {
152 $listeners[$k] = $v;
153 }
154 }
155
156 if ($listeners) {
157 $this->listeners[$eventName][$priority] = $listeners;
158 } else {
159 unset($this->listeners[$eventName][$priority]);
160 }
161 }
162 }
163
164 /**
165 * {@inheritdoc}
166 */
167 public function addSubscriber(EventSubscriberInterface $subscriber)
168 {
169 foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
170 if (\is_string($params)) {
171 $this->addListener($eventName, [$subscriber, $params]);
172 } elseif (\is_string($params[0])) {
173 $this->addListener($eventName, [$subscriber, $params[0]], isset($params[1]) ? $params[1] : 0);
174 } else {
175 foreach ($params as $listener) {
176 $this->addListener($eventName, [$subscriber, $listener[0]], isset($listener[1]) ? $listener[1] : 0);
177 }
178 }
179 }
180 }
181
182 /**
183 * {@inheritdoc}
184 */
185 public function removeSubscriber(EventSubscriberInterface $subscriber)
186 {
187 foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
188 if (\is_array($params) && \is_array($params[0])) {
189 foreach ($params as $listener) {
190 $this->removeListener($eventName, [$subscriber, $listener[0]]);
191 }
192 } else {
193 $this->removeListener($eventName, [$subscriber, \is_string($params) ? $params : $params[0]]);
194 }
195 }
196 }
197
198 /**
199 * Triggers the listeners of an event.
200 *
201 * This method can be overridden to add functionality that is executed
202 * for each listener.
203 *
204 * @param callable[] $listeners The event listeners
205 * @param string $eventName The name of the event to dispatch
206 * @param Event $event The event object to pass to the event handlers/listeners
207 */
208 protected function doDispatch($listeners, $eventName, Event $event)
209 {
210 foreach ($listeners as $listener) {
211 if ($event->isPropagationStopped()) {
212 break;
213 }
214 \call_user_func($listener, $event, $eventName, $this);
215 }
216 }
217
218 /**
219 * Sorts the internal list of listeners for the given event by priority.
220 *
221 * @param string $eventName The name of the event
222 */
223 private function sortListeners($eventName)
224 {
225 krsort($this->listeners[$eventName]);
226 $this->sorted[$eventName] = [];
227
228 foreach ($this->listeners[$eventName] as $priority => $listeners) {
229 foreach ($listeners as $k => $listener) {
230 if (\is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
231 $listener[0] = $listener[0]();
232 $this->listeners[$eventName][$priority][$k] = $listener;
233 }
234 $this->sorted[$eventName][] = $listener;
235 }
236 }
237 }
238 }
239