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<?php |
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namespace SmoothPhp\EventSourcing; |
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use SmoothPhp\Contracts\EventSourcing\AggregateRoot as AggregateRootInterface; |
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use SmoothPhp\Contracts\EventSourcing\Entity as EntityInterface; |
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use SmoothPhp\Contracts\EventSourcing\Event; |
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use SmoothPhp\Domain\DomainEventStream; |
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use SmoothPhp\Domain\DomainMessage; |
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use SmoothPhp\Domain\Metadata; |
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/** |
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* Class AggregateRoot |
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* @author Simon Bennett <[email protected]> |
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*/ |
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abstract class AggregateRoot implements AggregateRootInterface |
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{ |
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/** |
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* @var [] |
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*/ |
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private $uncommittedEvents = []; |
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private $playHead = -1; |
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/** |
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* @param Event $event |
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*/ |
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public function apply(Event $event) |
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{ |
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$this->handleRecursively($event); |
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$this->playHead++; |
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$this->uncommittedEvents[] = DomainMessage::recordNow( |
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$this->getAggregateRootId(), |
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$this->playHead, |
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new Metadata(array()), |
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$event |
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); |
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} |
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/** |
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* Handles event if capable. |
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* |
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* @param $event |
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*/ |
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View Code Duplication |
protected function handle(Event $event) |
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{ |
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$method = $this->getApplyMethod($event); |
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if (!method_exists($this, $method)) { |
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return; |
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} |
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$this->$method($event); |
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} |
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/** |
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* @param Event $event |
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*/ |
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protected function handleRecursively(Event $event) |
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{ |
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$this->handle($event); |
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foreach ($this->getChildren() as $child) { |
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$child->registerAggregateRoot($this); |
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$child->handleRecursively($event); |
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} |
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} |
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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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private function getApplyMethod(Event $event) |
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{ |
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$classParts = explode('\\', get_class($event)); |
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return 'apply' . end($classParts); |
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} |
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/** |
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* @return DomainEventStream |
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*/ |
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public function getUncommittedEvents() |
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{ |
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$stream = new DomainEventStream($this->uncommittedEvents); |
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$this->uncommittedEvents = []; |
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return $stream; |
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} |
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/** |
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* @param DomainEventStream $stream |
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*/ |
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public function initializeState(DomainEventStream $stream) |
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{ |
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foreach ($stream as $message) { |
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$this->playHead++; |
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$this->handle($message->getPayload()); |
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} |
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} |
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/** |
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* @return EntityInterface[] $entity |
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*/ |
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public function getChildren() |
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{ |
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return []; |
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} |
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} |
SmoothPhp /
CQRS-ES-Framework
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.