149 lines
4.5 KiB
PHP
149 lines
4.5 KiB
PHP
<?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\Bundle\FrameworkBundle;
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use Symfony\Component\DependencyInjection\ContainerInterface;
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use Symfony\Component\EventDispatcher\EventDispatcher;
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use Symfony\Component\EventDispatcher\Event;
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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 <bernhard.schussek@symfony.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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* @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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* @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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* @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 integer $priority The higher this value, the earlier an event listener
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* will be triggered in the chain.
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* Defaults to 0.
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*/
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public function addListenerService($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], $priority);
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}
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/**
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* @see EventDispatcherInterface::hasListeners
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*/
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public function hasListeners($eventName = null)
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{
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if (null === $eventName) {
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return (Boolean) count($this->listenerIds) || (Boolean) 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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* @see EventDispatcherInterface::getListeners
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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 => $listners) {
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$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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* Lazily loads listeners for this event from the dependency injection
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* container.
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*
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* @throws \InvalidArgumentException if the service is not defined
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*/
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public function dispatch($eventName, Event $event = null)
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{
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$this->lazyLoad($eventName);
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parent::dispatch($eventName, $event);
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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 $args) {
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list($serviceId, $method, $priority) = $args;
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$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][$key]) {
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$this->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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