87 lines
2.5 KiB
PHP
87 lines
2.5 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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* 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|array $eventNames One or more events for which the listener is added
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* @param string $serviceId The ID of the listener service
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* @param integer $priority The higher this value, the earlier an event listener
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* will be triggered in the chain.
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* Defaults to 0.
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*/
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public function addListenerService($eventNames, $serviceId, $priority = 0)
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{
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if (!is_string($serviceId)) {
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throw new \InvalidArgumentException('Expected a string argument');
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}
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foreach ((array) $eventNames as $eventName) {
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// Prevent duplicate entries
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$this->listenerIds[$eventName][$serviceId] = $priority;
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}
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}
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/**
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* {@inheritDoc}
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*
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* Lazily loads listeners for this event from the dependency injection
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* container.
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*/
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public function dispatch($eventName, Event $event = null)
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{
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if (isset($this->listenerIds[$eventName])) {
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foreach ($this->listenerIds[$eventName] as $serviceId => $priority) {
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$this->addListener($eventName, $this->container->get($serviceId), $priority);
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}
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}
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parent::dispatch($eventName, $event);
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}
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}
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