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<?php |
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declare(strict_types=1); |
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namespace Blixit\EventSourcing\Store\SnapshotStore; |
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use Blixit\EventSourcing\Aggregate\AggregateRootInterface; |
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use Blixit\EventSourcing\Event\EventInterface; |
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use Blixit\EventSourcing\Messaging\DispatcherInterface; |
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use Blixit\EventSourcing\Store\EventStore; |
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use Blixit\EventSourcing\Store\Persistence\EventPersisterException; |
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use Blixit\EventSourcing\Store\Persistence\EventPersisterInterface; |
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use ReflectionException; |
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use function serialize; |
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use function unserialize; |
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class SnapshotStore extends EventStore |
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{ |
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// define this parameter as a snapshot parameter |
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public const STEP = 10; |
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/** @var SnapshotPersisterInterface $snapshotPersister */ |
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private $snapshotPersister; |
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/** @var SnapshotConfiguration $configuration */ |
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private $configuration; |
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public function __construct( |
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string $aggregateClass, |
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EventPersisterInterface $eventPersister, |
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string $streamStrategyClass, |
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SnapshotPersisterInterface $snapshotPersister, |
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?SnapshotConfiguration $configuration, |
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?DispatcherInterface $messageBus |
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) { |
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parent::__construct($aggregateClass, $eventPersister, $streamStrategyClass, $messageBus); |
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$this->snapshotPersister = $snapshotPersister; |
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$this->configuration = empty($configuration) |
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? new SnapshotConfiguration(self::STEP, Snapshot::class) |
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: $configuration; |
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} |
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/** |
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* @throws EventPersisterException |
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* @throws ReflectionException |
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*/ |
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protected function writeLoopIteration(AggregateRootInterface &$aggregateRoot, EventInterface &$event) : void |
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{ |
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parent::writeLoopIteration($aggregateRoot, $event); |
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$snapshotAggregate = $this->buildAggregatelocally($aggregateRoot->getAggregateId()); |
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if ($event->getSequence() < $snapshotAggregate->getSequence() + $this->configuration->getSteps()) { |
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return; |
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} |
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$this->snapshotPersister->snapshot($this->toSnapshot($aggregateRoot)); |
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} |
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/** |
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* @param mixed $aggregateId |
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* |
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* @throws ReflectionException |
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*/ |
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protected function buildAggregatelocally($aggregateId) : AggregateRootInterface |
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{ |
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$streamName = (string) $this->getStreamNameForAggregateId($aggregateId); |
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$snapshot = $this->snapshotPersister->get($streamName); |
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return $this->toAggregate($snapshot) ?? $this->getEmptyAggregate($aggregateId); |
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} |
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/** |
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* @param mixed $aggregateId |
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* |
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* @throws ReflectionException |
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*/ |
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protected function buildAggregate($aggregateId) : AggregateRootInterface |
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{ |
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return $this->buildAggregatelocally($aggregateId); |
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} |
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protected function toSnapshot(AggregateRootInterface $aggregateRoot) : SnapshotInterface |
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{ |
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$streamName = (string) $this->getStreamNameForAggregateId($aggregateRoot->getAggregateId()); |
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$snapshotClass = $this->configuration->getSnapshotClass(); |
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return new $snapshotClass($streamName, serialize($aggregateRoot)); |
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} |
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protected function toAggregate(?SnapshotInterface $snapshot = null) : ?AggregateRootInterface |
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{ |
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return empty($snapshot) |
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? null |
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: unserialize($snapshot->getPayload()); |
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} |
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} |
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blixit /
event-sourcing
