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<?php declare(strict_types=1); |
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/* |
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* This file is part of Biurad opensource projects. |
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* |
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* @copyright 2019 Biurad Group (https://biurad.com/) |
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* @license https://opensource.org/licenses/BSD-3-Clause License |
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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 Flange\Handler; |
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use Psr\EventDispatcher\{EventDispatcherInterface, ListenerProviderInterface, StoppableEventInterface}; |
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/** |
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* A fully strict PSR 14 dispatcher and listener. |
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* |
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* @author Divine Niiquaye Ibok <[email protected]> |
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*/ |
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class EventHandler implements EventDispatcherInterface, ListenerProviderInterface |
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{ |
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private array $listeners = [], $calledEvents = []; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function dispatch(object $event): object |
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{ |
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$stoppable = $event instanceof StoppableEventInterface; |
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/** @var callable(object) $listener */ |
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foreach ($this->getListenersForEvent($event) as $listener) { |
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if ($stoppable && $event->isPropagationStopped()) { |
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break; |
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} |
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$listener($event); |
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} |
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return $event; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getListenersForEvent(object $event): iterable |
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{ |
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if (null === $calledListeners = &$this->calledEvents[$event::class] ?? null) { |
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if (empty($listeners = $this->listeners[$event::class] ?? [])) { |
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return []; |
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} |
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\krsort($listeners); // Sort Listeners by priority. |
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$calledListeners = \array_merge(...$listeners); |
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} |
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yield from $calledListeners; |
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} |
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/** |
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* Attaches listener to corresponding event based on the type-hint used for the event argument. |
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* |
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* @param callable $listener Any callable could be used be it a closure or invokable object |
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* @param int $priority The higher this value, the earlier an event listener will be triggered in the chain (defaults to 0) |
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*/ |
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public function addListener(string $eventClass, callable $listener, int $priority = 0): void |
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{ |
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$this->listeners[$eventClass][$priority][] = $listener; |
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unset($this->calledEvents[$eventClass]); |
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} |
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/** |
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* Checks if listeners exist for an event, else in general if event name is null. |
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*/ |
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public function hasListener(string $eventClass = null): bool |
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{ |
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if (null !== $eventClass) { |
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return !empty($this->listeners[$eventClass]); |
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} |
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foreach ($this->listeners as $eventListeners) { |
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if ($eventListeners) { |
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return true; |
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} |
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} |
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return false; |
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} |
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} |
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biurad /
flange
