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<?php |
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/** |
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* @package narrator |
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*/ |
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namespace Mleko\Narrator; |
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class BasicEventBus implements EventBus |
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{ |
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/** @var array */ |
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private $listeners = []; |
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/** @var EventNameExtractor */ |
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private $eventNameExtractor; |
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/** |
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* SimpleEventBus constructor. |
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* @param EventNameExtractor $eventNameExtractor |
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* @param Listener[][] $listeners |
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*/ |
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public function __construct(EventNameExtractor $eventNameExtractor, array $listeners = []) |
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{ |
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$this->eventNameExtractor = $eventNameExtractor; |
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foreach ($listeners as $eventName => $eventListeners) { |
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foreach ($eventListeners as $listener) { |
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$this->subscribe($eventName, $listener); |
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} |
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} |
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} |
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/** |
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* @param object $event |
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* @return void |
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*/ |
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public function emit($event) |
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{ |
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$eventName = $this->extractEventName($event); |
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$eventListeners = $this->getEventListeners($eventName); |
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$eventMeta = new Meta($event, $eventName, $eventName, $this); |
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foreach ($eventListeners as $listener) { |
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$listener->handle($event, $eventMeta); |
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} |
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} |
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/** |
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* @param string $eventName |
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* @param Listener $listener |
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* @return Subscription |
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*/ |
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public function subscribe($eventName, Listener $listener) |
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{ |
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$this->listeners[$eventName][] = $listener; |
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return new Subscription($eventName, $listener, $this); |
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} |
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/** |
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* @param string $eventName |
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* @param Listener $listener |
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* @return bool |
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*/ |
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public function unsubscribe($eventName, Listener $listener) |
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{ |
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$eventListeners = $this->getEventListeners($eventName); |
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foreach ($eventListeners as $key => $eventListener) { |
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if ($listener === $eventListener) { |
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unset($this->listeners[$eventName][$key]); |
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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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* @param $event |
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* @return string |
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*/ |
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private function extractEventName($event) |
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{ |
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return $this->eventNameExtractor->extract($event); |
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} |
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/** |
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* @param string $eventName |
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* @return Listener[] |
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*/ |
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private function getEventListeners($eventName) |
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{ |
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$eventListeners = array_key_exists($eventName, $this->listeners) ? $this->listeners[$eventName] : []; |
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return $eventListeners; |
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} |
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} |
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mleko /
narrator
