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<?php |
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/** |
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* This file is part of the Cubiche package. |
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* |
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* Copyright (c) Cubiche |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Cubiche\Domain\EventSourcing\Projector; |
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use Cubiche\Core\Cqrs\ReadModelInterface; |
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use Cubiche\Core\Cqrs\WriteModelInterface; |
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use Cubiche\Domain\EventPublisher\DomainEventSubscriberInterface; |
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use Cubiche\Domain\EventSourcing\Event\PostPersistEvent; |
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use Cubiche\Domain\Model\IdInterface; |
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use Cubiche\Domain\Repository\QueryRepositoryInterface; |
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/** |
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* Projector class. |
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* |
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* @author Ivannis Suárez Jerez <[email protected]> |
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*/ |
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abstract class Projector implements DomainEventSubscriberInterface |
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{ |
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/** |
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* @var QueryRepositoryInterface |
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*/ |
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protected $repository; |
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/** |
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* Projector constructor. |
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* |
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* @param QueryRepositoryInterface $repository |
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*/ |
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public function __construct(QueryRepositoryInterface $repository) |
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{ |
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$this->repository = $repository; |
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} |
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/** |
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* @param PostPersistEvent $event |
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*/ |
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public function onPostPersist(PostPersistEvent $event) |
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{ |
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// skip if the aggregate is not my write model class |
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if (is_a($event->aggregate(), $this->writeModelClass())) { |
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$eventStream = $event->eventStream(); |
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// find all read models that exist for a given write model |
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$readModels = $this->readModelsFromRepository($event->aggregate()->id()); |
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foreach ($readModels as $readModel) { |
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// create the initial projection |
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$projection = new Projection(Action::UPDATE(), $readModel); |
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// project it |
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$this->projectEvents($projection, $eventStream->events()); |
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} |
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// there is not read models for the given write model? |
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if (count($readModels) == 0) { |
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// create all read models of a given write model |
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$readModels = $this->readModelsFromWriteModel($event->aggregate()); |
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foreach ($readModels as $readModel) { |
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// create the initial projection |
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$projection = new Projection(Action::NONE(), $readModel); |
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// project it |
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$this->projectEvents($projection, $eventStream->events()); |
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} |
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if (count($readModels) == 0) { |
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// create the initial projection |
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$projection = new Projection(Action::NONE()); |
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// project it |
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$this->projectEvents($projection, $eventStream->events()); |
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} |
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} |
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} |
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} |
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/** |
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* @param Projection $projection |
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* @param array $events |
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*/ |
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protected function projectEvents(Projection $projection, array $events) |
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{ |
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foreach ($events as $event) { |
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$classParts = explode('\\', get_class($event)); |
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$method = 'project'.end($classParts); |
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if (method_exists($this, $method)) { |
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$this->$method($projection, $event); |
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} |
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} |
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switch ($projection->action()) { |
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case Action::CREATE(): |
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case Action::UPDATE(): |
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// the read model should be created/updated |
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$this->persist($projection->readModel()); |
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break; |
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case Action::REMOVE(): |
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// the read model should be removed |
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$this->remove($projection->readModel()); |
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break; |
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} |
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} |
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/** |
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* @param ReadModelInterface $readModel |
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*/ |
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protected function persist(ReadModelInterface $readModel) |
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{ |
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$this->repository->persist($readModel); |
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} |
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/** |
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* @param ReadModelInterface $readModel |
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*/ |
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protected function remove(ReadModelInterface $readModel) |
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{ |
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$this->repository->remove($readModel); |
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} |
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/** |
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* @param IdInterface $writeModelId |
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* |
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* @return array |
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*/ |
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abstract protected function readModelsFromRepository(IdInterface $writeModelId); |
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/** |
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* @param WriteModelInterface $writeModel |
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* |
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* @return array |
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*/ |
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abstract protected function readModelsFromWriteModel(WriteModelInterface $writeModel); |
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/** |
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* @return string |
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*/ |
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abstract protected function writeModelClass(); |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function getSubscribedEvents() |
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{ |
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return array( |
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PostPersistEvent::class => array('onPostPersist', 250), |
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); |
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} |
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} |
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cubiche /
event-sourcing
