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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\EventDispatcher;
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use Symfony\Component\DependencyInjection\ContainerInterface;
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/**
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* Lazily loads listeners and subscribers from the dependency injection
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* container.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Bernhard Schussek <bschussek@gmail.com>
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* @author Jordan Alliot <jordan.alliot@gmail.com>
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*/
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class ContainerAwareEventDispatcher extends EventDispatcher
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{
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/**
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* The container from where services are loaded.
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*
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* @var ContainerInterface
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*/
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private $container;
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/**
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* The service IDs of the event listeners and subscribers.
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*
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* @var array
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*/
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private $listenerIds = array();
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/**
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* The services registered as listeners.
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*
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* @var array
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*/
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private $listeners = array();
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/**
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* Constructor.
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*
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* @param ContainerInterface $container A ContainerInterface instance
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*/
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public function __construct(ContainerInterface $container)
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{
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$this->container = $container;
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}
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/**
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* Adds a service as event listener.
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*
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* @param string $eventName Event for which the listener is added
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* @param array $callback The service ID of the listener service & the method
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* name that has to be called
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* @param int $priority The higher this value, the earlier an event listener
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* will be triggered in the chain.
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* Defaults to 0.
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*
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* @throws \InvalidArgumentException
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*/
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public function addListenerService($eventName, $callback, $priority = 0)
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{
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if (!is_array($callback) || 2 !== count($callback)) {
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throw new \InvalidArgumentException('Expected an array("service", "method") argument');
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}
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$this->listenerIds[$eventName][] = array($callback[0], $callback[1], $priority);
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}
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public function removeListener($eventName, $listener)
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{
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$this->lazyLoad($eventName);
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if (isset($this->listenerIds[$eventName])) {
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foreach ($this->listenerIds[$eventName] as $i => list($serviceId, $method, $priority)) {
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$key = $serviceId.'.'.$method;
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if (isset($this->listeners[$eventName][$key]) && $listener === array($this->listeners[$eventName][$key], $method)) {
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unset($this->listeners[$eventName][$key]);
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if (empty($this->listeners[$eventName])) {
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unset($this->listeners[$eventName]);
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}
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unset($this->listenerIds[$eventName][$i]);
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if (empty($this->listenerIds[$eventName])) {
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unset($this->listenerIds[$eventName]);
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}
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}
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}
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}
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parent::removeListener($eventName, $listener);
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}
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/**
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* {@inheritdoc}
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*/
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public function hasListeners($eventName = null)
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{
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if (null === $eventName) {
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return (bool) count($this->listenerIds) || (bool) count($this->listeners);
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}
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if (isset($this->listenerIds[$eventName])) {
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return true;
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}
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return parent::hasListeners($eventName);
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}
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/**
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* {@inheritdoc}
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*/
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public function getListeners($eventName = null)
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{
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if (null === $eventName) {
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foreach ($this->listenerIds as $serviceEventName => $args) {
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$this->lazyLoad($serviceEventName);
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}
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} else {
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$this->lazyLoad($eventName);
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}
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return parent::getListeners($eventName);
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}
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/**
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* {@inheritdoc}
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*/
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public function getListenerPriority($eventName, $listener)
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{
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$this->lazyLoad($eventName);
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return parent::getListenerPriority($eventName, $listener);
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}
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/**
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* Adds a service as event subscriber.
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*
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* @param string $serviceId The service ID of the subscriber service
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* @param string $class The service's class name (which must implement EventSubscriberInterface)
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*/
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public function addSubscriberService($serviceId, $class)
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{
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foreach ($class::getSubscribedEvents() as $eventName => $params) {
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if (is_string($params)) {
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$this->listenerIds[$eventName][] = array($serviceId, $params, 0);
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} elseif (is_string($params[0])) {
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$this->listenerIds[$eventName][] = array($serviceId, $params[0], isset($params[1]) ? $params[1] : 0);
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} else {
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foreach ($params as $listener) {
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$this->listenerIds[$eventName][] = array($serviceId, $listener[0], isset($listener[1]) ? $listener[1] : 0);
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}
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}
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}
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}
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public function getContainer()
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{
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return $this->container;
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}
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/**
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* Lazily loads listeners for this event from the dependency injection
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* container.
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*
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* @param string $eventName The name of the event to dispatch. The name of
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* the event is the name of the method that is
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* invoked on listeners.
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*/
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protected function lazyLoad($eventName)
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{
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if (isset($this->listenerIds[$eventName])) {
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foreach ($this->listenerIds[$eventName] as list($serviceId, $method, $priority)) {
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$listener = $this->container->get($serviceId);
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$key = $serviceId.'.'.$method;
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if (!isset($this->listeners[$eventName][$key])) {
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$this->addListener($eventName, array($listener, $method), $priority);
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} elseif ($listener !== $this->listeners[$eventName][$key]) {
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parent::removeListener($eventName, array($this->listeners[$eventName][$key], $method));
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$this->addListener($eventName, array($listener, $method), $priority);
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}
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$this->listeners[$eventName][$key] = $listener;
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}
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}
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}
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}
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