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ContainerAwareEventDispatcher.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 use Symfony\Component\DependencyInjection\ContainerInterface;
015
016 /**
017 * Lazily loads listeners and subscribers from the dependency injection
018 * container.
019 *
020 * @author Fabien Potencier <fabien@symfony.com>
021 * @author Bernhard Schussek <bschussek@gmail.com>
022 * @author Jordan Alliot <jordan.alliot@gmail.com>
023 */
024 class ContainerAwareEventDispatcher extends EventDispatcher
025 {
026 /**
027 * The container from where services are loaded.
028 *
029 * @var ContainerInterface
030 */
031 private $container;
032
033 /**
034 * The service IDs of the event listeners and subscribers.
035 *
036 * @var array
037 */
038 private $listenerIds = array();
039
040 /**
041 * The services registered as listeners.
042 *
043 * @var array
044 */
045 private $listeners = array();
046
047 /**
048 * Constructor.
049 *
050 * @param ContainerInterface $container A ContainerInterface instance
051 */
052 public function __construct(ContainerInterface $container)
053 {
054 $this->container = $container;
055 }
056
057 /**
058 * Adds a service as event listener.
059 *
060 * @param string $eventName Event for which the listener is added
061 * @param array $callback The service ID of the listener service & the method
062 * name that has to be called
063 * @param int $priority The higher this value, the earlier an event listener
064 * will be triggered in the chain.
065 * Defaults to 0.
066 *
067 * @throws \InvalidArgumentException
068 */
069 public function addListenerService($eventName, $callback, $priority = 0)
070 {
071 if (!is_array($callback) || 2 !== count($callback)) {
072 throw new \InvalidArgumentException('Expected an array("service", "method") argument');
073 }
074
075 $this->listenerIds[$eventName][] = array($callback[0], $callback[1], $priority);
076 }
077
078 public function removeListener($eventName, $listener)
079 {
080 $this->lazyLoad($eventName);
081
082 if (isset($this->listenerIds[$eventName])) {
083 foreach ($this->listenerIds[$eventName] as $i => $args) {
084 list($serviceId, $method, $priority) = $args;
085 $key = $serviceId.'.'.$method;
086 if (isset($this->listeners[$eventName][$key]) && $listener === array($this->listeners[$eventName][$key], $method)) {
087 unset($this->listeners[$eventName][$key]);
088 if (empty($this->listeners[$eventName])) {
089 unset($this->listeners[$eventName]);
090 }
091 unset($this->listenerIds[$eventName][$i]);
092 if (empty($this->listenerIds[$eventName])) {
093 unset($this->listenerIds[$eventName]);
094 }
095 }
096 }
097 }
098
099 parent::removeListener($eventName, $listener);
100 }
101
102 /**
103 * {@inheritdoc}
104 */
105 public function hasListeners($eventName = null)
106 {
107 if (null === $eventName) {
108 return (bool) count($this->listenerIds) || (bool) count($this->listeners);
109 }
110
111 if (isset($this->listenerIds[$eventName])) {
112 return true;
113 }
114
115 return parent::hasListeners($eventName);
116 }
117
118 /**
119 * {@inheritdoc}
120 */
121 public function getListeners($eventName = null)
122 {
123 if (null === $eventName) {
124 foreach ($this->listenerIds as $serviceEventName => $args) {
125 $this->lazyLoad($serviceEventName);
126 }
127 } else {
128 $this->lazyLoad($eventName);
129 }
130
131 return parent::getListeners($eventName);
132 }
133
134 /**
135 * {@inheritdoc}
136 */
137 public function getListenerPriority($eventName, $listener)
138 {
139 $this->lazyLoad($eventName);
140
141 return parent::getListenerPriority($eventName, $listener);
142 }
143
144 /**
145 * Adds a service as event subscriber.
146 *
147 * @param string $serviceId The service ID of the subscriber service
148 * @param string $class The service's class name (which must implement EventSubscriberInterface)
149 */
150 public function addSubscriberService($serviceId, $class)
151 {
152 foreach ($class::getSubscribedEvents() as $eventName => $params) {
153 if (is_string($params)) {
154 $this->listenerIds[$eventName][] = array($serviceId, $params, 0);
155 } elseif (is_string($params[0])) {
156 $this->listenerIds[$eventName][] = array($serviceId, $params[0], isset($params[1]) ? $params[1] : 0);
157 } else {
158 foreach ($params as $listener) {
159 $this->listenerIds[$eventName][] = array($serviceId, $listener[0], isset($listener[1]) ? $listener[1] : 0);
160 }
161 }
162 }
163 }
164
165 public function getContainer()
166 {
167 return $this->container;
168 }
169
170 /**
171 * Lazily loads listeners for this event from the dependency injection
172 * container.
173 *
174 * @param string $eventName The name of the event to dispatch. The name of
175 * the event is the name of the method that is
176 * invoked on listeners.
177 */
178 protected function lazyLoad($eventName)
179 {
180 if (isset($this->listenerIds[$eventName])) {
181 foreach ($this->listenerIds[$eventName] as $args) {
182 list($serviceId, $method, $priority) = $args;
183 $listener = $this->container->get($serviceId);
184
185 $key = $serviceId.'.'.$method;
186 if (!isset($this->listeners[$eventName][$key])) {
187 $this->addListener($eventName, array($listener, $method), $priority);
188 } elseif ($listener !== $this->listeners[$eventName][$key]) {
189 parent::removeListener($eventName, array($this->listeners[$eventName][$key], $method));
190 $this->addListener($eventName, array($listener, $method), $priority);
191 }
192
193 $this->listeners[$eventName][$key] = $listener;
194 }
195 }
196 }
197 }
198