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<?php |
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declare(strict_types=1); |
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namespace Jarvis\Skill\EventBroadcaster; |
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/** |
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* @author Eric Chau <[email protected]> |
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*/ |
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trait BroadcasterTrait |
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{ |
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private $receivers = []; |
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private $permanentEvents = []; |
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private $computedReceivers = []; |
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private $masterEmitter = false; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function on(string $name, $receiver, int $priority = BroadcasterInterface::RECEIVER_NORMAL_PRIORITY): void |
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{ |
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if (!isset($this->receivers[$name])) { |
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$this->receivers[$name] = [ |
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BroadcasterInterface::RECEIVER_LOW_PRIORITY => [], |
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BroadcasterInterface::RECEIVER_NORMAL_PRIORITY => [], |
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BroadcasterInterface::RECEIVER_HIGH_PRIORITY => [], |
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]; |
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} |
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$this->receivers[$name][$priority][] = $receiver; |
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$this->computedReceivers[$name] = null; |
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if (isset($this->permanentEvents[$name])) { |
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$this->runReceiverCallback($receiver, $this->permanentEvents[$name]); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function broadcast(string $name, EventInterface $event = null): void |
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{ |
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if (isset($this->permanentEvents[$name])) { |
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throw new \LogicException('Permanent event cannot be broadcasted multiple times.'); |
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} |
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$event = $event ?? new SimpleEvent(); |
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if ($event instanceof PermanentEventInterface && $event->isPermanent()) { |
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$this->permanentEvents[$name] = $event; |
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} |
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if (isset($this->receivers[$name])) { |
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foreach ($this->buildEventReceivers($name) as $receiver) { |
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$this->runReceiverCallback($receiver, $event); |
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if ($event->isPropagationStopped()) { |
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break; |
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} |
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} |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function runReceiverCallback($receiver, EventInterface $event) |
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{ |
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call_user_func($receiver, ['event' => $event]); |
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} |
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/** |
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* Builds and returns well ordered receivers collection that match with provided event name. |
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* |
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* @param string $name The event name we want to get its receivers |
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* @return array |
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*/ |
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private function buildEventReceivers(string $name): array |
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{ |
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return $this->computedReceivers[$name] = $this->computedReceivers[$name] ?? array_merge( |
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$this->receivers[$name][BroadcasterInterface::RECEIVER_HIGH_PRIORITY], |
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$this->receivers[$name][BroadcasterInterface::RECEIVER_NORMAL_PRIORITY], |
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$this->receivers[$name][BroadcasterInterface::RECEIVER_LOW_PRIORITY] |
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); |
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} |
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} |
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eric-chau /
jarvis
