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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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$this->handleRecursively($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
