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<?php |
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/** |
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* Phoole (PHP7.2+) |
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* |
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* @category Library |
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* @package Phoole\Event |
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* @copyright Copyright (c) 2019 Hong Zhang |
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*/ |
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declare(strict_types=1); |
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namespace Phoole\Event; |
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use Phoole\Base\Queue\UniquePriorityQueue; |
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use Psr\EventDispatcher\StoppableEventInterface; |
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use Psr\EventDispatcher\EventDispatcherInterface; |
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/** |
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* Dispatcher |
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* |
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* @package Phoole\Event |
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*/ |
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class Dispatcher implements EventDispatcherInterface |
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{ |
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/** |
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* @var Provider[] |
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*/ |
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protected $providers = []; |
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/** |
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* Dispatcher constructor. |
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* |
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* @param Provider ...$providers |
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*/ |
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public function __construct(Provider ...$providers) |
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{ |
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foreach ($providers as $p) { |
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$this->addProvider($p); |
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} |
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} |
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/** |
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* Provide all relevant listeners with an event to process. |
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* |
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* @param object $event |
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* The object to process. |
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* |
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* @return object |
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* The Event that was passed, now modified by listeners. |
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*/ |
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public function dispatch(object $event) |
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{ |
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foreach ($this->getListeners($event) as $listener) { |
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if ($event instanceof StoppableEventInterface && $event->isPropagationStopped()) { |
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return $event; |
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} |
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$listener($event); |
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} |
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return $event; |
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} |
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/** |
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* Add a provider to the dispatcher |
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* |
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* @param Provider $provider |
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* @return void |
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* @throws \RuntimeException if provider duplicated |
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*/ |
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protected function addProvider(Provider $provider) |
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{ |
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$hash = \spl_object_hash($provider); |
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if (!isset($this->providers[$hash])) { |
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$this->providers[$hash] = $provider; |
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} else { |
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throw new \RuntimeException("Provider duplicated"); |
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} |
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} |
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/** |
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* @param object $event |
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* @return iterable |
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*/ |
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View Code Duplication |
protected function getListeners(object $event): iterable |
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{ |
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$queue = new UniquePriorityQueue(); |
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foreach ($this->providers as $provider) { |
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/** @var UniquePriorityQueue $q */ |
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$q = $provider->getListenersForEvent($event); |
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if (count($q)) { |
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$queue = $queue->combine($q); |
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} |
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} |
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return $queue; |
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} |
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} |
phoole /
event
