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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 Generator; |
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use Throwable; |
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use function assert; |
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use function count; |
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/** |
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* @template T of AggregateRoot |
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* |
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* @template-implements AggregateRootRepository<T> |
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*/ |
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class EventSourcedAggregateRootRepository implements AggregateRootRepository |
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{ |
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/** @var class-string<T> */ |
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private string $aggregateRootClassName; |
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private MessageRepository $messages; |
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private MessageDecorator $decorator; |
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private MessageDispatcher $dispatcher; |
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/** |
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* @param class-string<T> $aggregateRootClassName |
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*/ |
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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->messages = $messageRepository; |
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$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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try { |
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/** @var AggregateRoot $className */ |
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/** @phpstan-var class-string<T> $className */ |
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$className = $this->aggregateRootClassName; |
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$events = $this->retrieveAllEvents($aggregateRootId); |
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return $className::reconstituteFromEvents($aggregateRootId, $events); |
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} catch (Throwable $throwable) { |
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throw UnableToReconstituteAggregateRoot::becauseOf($throwable->getMessage(), $throwable); |
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} |
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} |
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private function retrieveAllEvents(AggregateRootId $aggregateRootId): Generator |
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{ |
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/** @var Generator<Message> $messages */ |
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$messages = $this->messages->retrieveAll($aggregateRootId); |
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foreach ($messages as $message) { |
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yield $message->event(); |
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} |
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return $messages->getReturn(); |
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} |
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public function persist(object $aggregateRoot): void |
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{ |
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assert($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): void |
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{ |
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if (0 === count($events)) { |
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return; |
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} |
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// decrease the aggregate root version by the number of raised events |
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// so the version of each message represents the version at the time |
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// of recording. |
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$aggregateRootVersion = $aggregateRootVersion - count($events); |
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$metadata = [Header::AGGREGATE_ROOT_ID => $aggregateRootId]; |
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$messages = array_map(fn (object $event) => $this->decorator->decorate(new Message( |
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$event, |
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$metadata + [Header::AGGREGATE_ROOT_VERSION => ++$aggregateRootVersion] |
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)), $events); |
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$this->messages->persist(...$messages); |
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$this->dispatcher->dispatch(...$messages); |
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} |
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} |
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EventSaucePHP /
EventSauce
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