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