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<?php |
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declare(strict_types=1); |
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namespace EventSauce\EventSourcing; |
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use function assert; |
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use Generator; |
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final class ConstructingAggregateRootRepository implements AggregateRootRepository |
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{ |
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/** |
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* @var string |
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*/ |
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private $aggregateRootClassName; |
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/** |
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* @var MessageRepository |
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*/ |
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private $repository; |
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/** |
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* @var MessageDecorator |
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*/ |
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private $decorator; |
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/** |
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* @var MessageDispatcher |
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*/ |
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private $dispatcher; |
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public function __construct( |
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string $aggregateRootClassName, |
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MessageRepository $messageRepository, |
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MessageDispatcher $dispatcher = null, |
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MessageDecorator $decorator = null |
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) { |
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$this->aggregateRootClassName = $aggregateRootClassName; |
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$this->repository = $messageRepository; |
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$this->dispatcher = $dispatcher ?: new SynchronousMessageDispatcher(); |
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$this->decorator = $decorator ?: new DefaultHeadersDecorator(); |
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} |
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public function retrieve(AggregateRootId $aggregateRootId): object |
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{ |
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/** @var AggregateRoot $className */ |
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$className = $this->aggregateRootClassName; |
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$events = $this->retrieveAllEvents($aggregateRootId); |
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return $className::reconstituteFromEvents($aggregateRootId, $events); |
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} |
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private function retrieveAllEvents(AggregateRootId $aggregateRootId): Generator |
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{ |
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/** @var Message $message */ |
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foreach ($this->repository->retrieveAll($aggregateRootId) as $message) { |
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yield $message->event(); |
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} |
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} |
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public function persist(object $aggregateRoot) |
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{ |
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assert($aggregateRoot instanceof AggregateRoot, "Expected \$aggregateRoot to be an instance of " . AggregateRoot::class); |
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$this->persistEvents( |
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$aggregateRoot->aggregateRootId(), |
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$aggregateRoot->aggregateRootVersion(), |
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...$aggregateRoot->releaseEvents() |
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); |
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} |
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public function persistEvents(AggregateRootId $aggregateRootId, int $aggregateRootVersion, object ...$events) |
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{ |
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$metadata = [Header::AGGREGATE_ROOT_ID => $aggregateRootId]; |
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$messages = array_map(function (object $event) use ($metadata, &$aggregateRootVersion) { |
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return $this->decorator->decorate(new Message( |
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$event, |
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$metadata + [Header::AGGREGATE_ROOT_VERSION => ++$aggregateRootVersion] |
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)); |
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}, $events); |
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$this->repository->persist(...$messages); |
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$this->dispatcher->dispatch(...$messages); |
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} |
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} |
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EventSaucePHP /
EventSauce
