138 lines
4.3 KiB
PHP
138 lines
4.3 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\Bridge\Doctrine;
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use Doctrine\Common\EventArgs;
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use Doctrine\Common\EventManager;
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use Symfony\Component\DependencyInjection\ContainerInterface;
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/**
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* Allows lazy loading of listener services.
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*
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* @author Johannes M. Schmitt <schmittjoh@gmail.com>
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*/
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class ContainerAwareEventManager extends EventManager
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{
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/**
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* Map of registered listeners.
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* <event> => <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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private $initialized = array();
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private $container;
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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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* Dispatches an event to all registered listeners.
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*
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* @param string $eventName The name of the event to dispatch. The name of the event is
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* the name of the method that is invoked on listeners.
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* @param EventArgs $eventArgs The event arguments to pass to the event handlers/listeners.
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* If not supplied, the single empty EventArgs instance is used.
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* @return boolean
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*/
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public function dispatchEvent($eventName, EventArgs $eventArgs = null)
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{
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if (isset($this->listeners[$eventName])) {
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$eventArgs = $eventArgs === null ? EventArgs::getEmptyInstance() : $eventArgs;
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$initialized = isset($this->initialized[$eventName]);
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foreach ($this->listeners[$eventName] as $hash => $listener) {
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if (!$initialized && is_string($listener)) {
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$this->listeners[$eventName][$hash] = $listener = $this->container->get($listener);
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}
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$listener->$eventName($eventArgs);
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}
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$this->initialized[$eventName] = true;
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}
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}
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/**
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* Gets the listeners of a specific event or all listeners.
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*
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* @param string $event The name of the event.
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* @return array The event listeners for the specified event, or all event listeners.
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*/
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public function getListeners($event = null)
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{
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return $event ? $this->listeners[$event] : $this->listeners;
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}
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/**
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* Checks whether an event has any registered listeners.
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*
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* @param string $event
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* @return boolean TRUE if the specified event has any listeners, FALSE otherwise.
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*/
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public function hasListeners($event)
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{
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return isset($this->listeners[$event]) && $this->listeners[$event];
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}
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/**
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* Adds an event listener that listens on the specified events.
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*
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* @param string|array $events The event(s) to listen on.
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* @param object|string $listener The listener object.
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*/
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public function addEventListener($events, $listener)
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{
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if (is_string($listener)) {
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if ($this->initialized) {
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throw new \RuntimeException('Adding lazy-loading listeners after construction is not supported.');
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}
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$hash = '_service_'.$listener;
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} else {
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// Picks the hash code related to that listener
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$hash = spl_object_hash($listener);
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}
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foreach ((array) $events as $event) {
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// Overrides listener if a previous one was associated already
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// Prevents duplicate listeners on same event (same instance only)
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$this->listeners[$event][$hash] = $listener;
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}
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}
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/**
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* Removes an event listener from the specified events.
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*
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* @param string|array $events
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* @param object|string $listener
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*/
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public function removeEventListener($events, $listener)
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{
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if (is_string($listener)) {
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$hash = '_service_'.$listener;
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} else {
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// Picks the hash code related to that listener
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$hash = spl_object_hash($listener);
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}
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foreach ((array) $events as $event) {
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// Check if actually have this listener associated
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if (isset($this->listeners[$event][$hash])) {
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unset($this->listeners[$event][$hash]);
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}
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}
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}
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}
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