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<?php |
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/** |
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* @file |
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*/ |
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namespace CultuurNet\UDB3\EventSourcing\DBAL; |
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use Broadway\Domain\DateTime; |
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use Broadway\Domain\DomainEventStream; |
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use Broadway\Domain\DomainMessage; |
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use Broadway\EventSourcing\EventStreamDecoratorInterface; |
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use Broadway\Serializer\SerializerInterface; |
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use Doctrine\DBAL\Connection; |
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use Doctrine\DBAL\Driver\Statement; |
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use Doctrine\DBAL\DBALException; |
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use Doctrine\DBAL\Schema\Column; |
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use Doctrine\DBAL\Schema\Index; |
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class EventStream |
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{ |
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/** |
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* @var Connection |
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*/ |
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protected $connection; |
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/** |
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* @var SerializerInterface |
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*/ |
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protected $payloadSerializer; |
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/** |
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* @var SerializerInterface |
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*/ |
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protected $metadataSerializer; |
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/** |
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* @var string |
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*/ |
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protected $tableName; |
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/** |
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* @var Statement |
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*/ |
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protected $loadStatement; |
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/** |
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* @var int |
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*/ |
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protected $previousId; |
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/** |
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* @var string |
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*/ |
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protected $primaryKey; |
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/** |
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* @var EventStreamDecoratorInterface |
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*/ |
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private $domainEventStreamDecorator; |
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/** |
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* @param Connection $connection |
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* @param SerializerInterface $payloadSerializer |
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* @param SerializerInterface $metadataSerializer |
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* @param string $tableName |
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* @param int $startId |
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* @param string $primaryKey |
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*/ |
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public function __construct( |
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Connection $connection, |
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SerializerInterface $payloadSerializer, |
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SerializerInterface $metadataSerializer, |
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$tableName, |
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$startId = 0, |
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$primaryKey = 'id' |
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) { |
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$this->connection = $connection; |
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$this->payloadSerializer = $payloadSerializer; |
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$this->metadataSerializer = $metadataSerializer; |
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$this->tableName = $tableName; |
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$this->previousId = $startId > 0 ? $startId - 1 : 0; |
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$this->primaryKey = $primaryKey; |
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$this->domainEventStreamDecorator = null; |
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} |
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/** |
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* @param EventStreamDecoratorInterface $domainEventStreamDecorator |
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* @return EventStream |
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*/ |
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public function withDomainEventStreamDecorator(EventStreamDecoratorInterface $domainEventStreamDecorator) |
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{ |
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$c = clone $this; |
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$c->domainEventStreamDecorator = $domainEventStreamDecorator; |
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return $c; |
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} |
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public function __invoke() |
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{ |
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$statement = $this->prepareLoadStatement(); |
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do { |
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$statement->bindValue('previousid', $this->previousId, 'integer'); |
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$statement->execute(); |
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$events = []; |
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while ($row = $statement->fetch()) { |
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$events[] = $this->deserializeEvent($row); |
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$this->previousId = $row[$this->primaryKey]; |
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} |
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/* @var DomainMessage[] $events */ |
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if (!empty($events)) { |
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$event = $events[0]; |
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$domainEventStream = new DomainEventStream($events); |
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if (!is_null($this->domainEventStreamDecorator)) { |
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// Because the load statement always returns one row at a |
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// time, and we always wrap a single domain message in a |
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// stream as a result, we can simply get the aggregate type |
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// and aggregate id from the first domain message in the |
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// stream. |
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$domainEventStream = $this->domainEventStreamDecorator->decorateForWrite( |
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get_class($event->getPayload()), |
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$event->getId(), |
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$domainEventStream |
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); |
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} |
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yield $domainEventStream; |
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} |
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} while (!empty($events)); |
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} |
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/** |
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* @return int |
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*/ |
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public function getPreviousId() |
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{ |
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return $this->previousId; |
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} |
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/** |
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* @return Statement |
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* @throws DBALException |
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*/ |
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protected function prepareLoadStatement() |
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{ |
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if (null === $this->loadStatement) { |
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$id = $this->primaryKey; |
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$query = "SELECT $id, uuid, playhead, metadata, payload, recorded_on |
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FROM $this->tableName |
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WHERE $id > :previousid |
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ORDER BY $id ASC |
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LIMIT 1"; |
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$this->loadStatement = $this->connection->prepare($query); |
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} |
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return $this->loadStatement; |
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} |
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/** |
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* @param $row |
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* @return DomainMessage |
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*/ |
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private function deserializeEvent($row) |
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{ |
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return new DomainMessage( |
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$row['uuid'], |
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$row['playhead'], |
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$this->metadataSerializer->deserialize(json_decode($row['metadata'], true)), |
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$this->payloadSerializer->deserialize(json_decode($row['payload'], true)), |
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DateTime::fromString($row['recorded_on']) |
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); |
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} |
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} |
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cultuurnet /
udb3-php
