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<?php declare(strict_types = 1); |
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namespace Venta\Event; |
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use Venta\Contracts\Event\Event; |
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use Venta\Contracts\Event\EventDispatcher as EventDispatcherContract; |
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use Venta\Event\Exception\InvalidListenerException; |
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/** |
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* Class EventDispatcher |
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* |
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* @package Venta\Event |
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*/ |
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class EventDispatcher implements EventDispatcherContract |
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{ |
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/** |
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* Array of events, being dispatched now. |
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* |
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* @var array |
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*/ |
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private $dispatching = []; |
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/** |
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* Array of defined events and it listeners. |
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* |
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* @var array |
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*/ |
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private $listeners = []; |
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/** |
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* Sorted listeners array cache. |
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* |
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* @var array |
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*/ |
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private $sortedListeners = []; |
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/** |
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* @inheritDoc |
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* @throws InvalidListenerException |
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*/ |
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public function addListener(string $eventName, $listener, int $priority = 0) |
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{ |
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if (!$this->canBeCalled($listener)) { |
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throw new InvalidListenerException($listener); |
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} |
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$this->listeners[$eventName][$priority][] = $listener; |
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unset($this->sortedListeners[$eventName]); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function dispatch(Event $event) |
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{ |
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if (isset($this->dispatching[$this->getEventName($event)])) { |
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return; |
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} |
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$this->dispatching[$this->getEventName($event)] = true; |
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$listeners = $this->getListeners($this->getEventName($event)); |
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foreach ($listeners as $index => $listener) { |
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$this->callListener($listener, $event); |
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if ($event->isPropagationStopped()) { |
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break; |
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} |
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} |
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unset($this->dispatching[$this->getEventName($event)]); |
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} |
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/** |
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* Performs call of the listener. |
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* |
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* @param mixed $listener |
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* @param Event $event |
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*/ |
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protected function callListener($listener, Event $event) |
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{ |
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$listener($event); |
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} |
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/** |
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* Defines, if listener can be called. |
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* |
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* @param mixed $listener |
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* @return bool |
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*/ |
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protected function canBeCalled($listener): bool |
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{ |
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return is_callable($listener); |
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} |
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/** |
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* Returns array of event listeners. |
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* |
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* @param string $eventName |
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* @return array |
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*/ |
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protected function getListeners(string $eventName): array |
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{ |
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if (!isset($this->listeners[$eventName])) { |
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return []; |
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} |
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if (!isset($this->sortedListeners[$eventName])) { |
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$this->sortedListeners[$eventName] = $this->sortEventListeners($eventName); |
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} |
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return $this->sortedListeners[$eventName]; |
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} |
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/** |
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* Merges all event listeners for particular event. |
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* |
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* @param string $eventName |
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* @return array |
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*/ |
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protected function sortEventListeners(string $eventName): array |
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{ |
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$listeners = $this->listeners[$eventName]; |
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$normalised = []; |
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ksort($listeners); |
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foreach ($listeners as $priorityListeners) { |
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foreach ($priorityListeners as $listener) { |
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$normalised[] = $listener; |
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} |
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} |
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return $normalised; |
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} |
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/** |
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* Returns event name. |
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* |
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* @param Event $event |
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* @return string |
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*/ |
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3 |
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private function getEventName(Event $event) |
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{ |
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return ltrim(get_class($event), '\\'); |
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} |
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} |
venta /
framework
