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<?php |
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namespace DDDominio\EventSourcing\Common; |
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use DDDominio\EventSourcing\Common\Annotation\AggregateDeleter; |
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use DDDominio\EventSourcing\Snapshotting\SnapshotInterface; |
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use DDDominio\EventSourcing\Snapshotting\Snapshotter; |
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use Doctrine\Common\Annotations\AnnotationReader; |
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class AggregateReconstructor |
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{ |
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/** |
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* @var Snapshotter |
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*/ |
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private $snapshooter; |
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/** |
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* @var AnnotationReader |
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*/ |
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private $annotationReader; |
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/** |
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* @param Snapshotter $snapshotter |
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*/ |
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public function __construct($snapshotter) |
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{ |
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$this->snapshooter = $snapshotter; |
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$this->annotationReader = new AnnotationReader(); |
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} |
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/** |
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* @param string $class |
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* @param EventStreamInterface $eventStream |
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* @param SnapshotInterface $snapshot |
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* @return EventSourcedAggregateRootInterface |
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*/ |
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public function reconstitute($class, $eventStream, $snapshot = null) |
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{ |
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$this->assertValidClass($class); |
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if (is_null($snapshot) && $eventStream->isEmpty()) { |
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return null; |
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} |
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if (!$eventStream->isEmpty()) { |
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$aggregateDeleterAnnotation = $this->annotationReader->getClassAnnotation( |
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new \ReflectionClass(get_class($eventStream->last())), |
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AggregateDeleter::class |
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); |
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if (!is_null($aggregateDeleterAnnotation)) { |
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return null; |
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} |
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} |
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if ($snapshot instanceof SnapshotInterface) { |
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$aggregate = $this->snapshooter->translateSnapshot($snapshot); |
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} else { |
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$aggregate = $this->buildEmptyAggregate($class); |
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} |
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foreach ($eventStream as $event) { |
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$aggregate->apply($event); |
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} |
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return $aggregate; |
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} |
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/** |
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* @param string $class |
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*/ |
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private function assertValidClass($class) |
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{ |
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$reflectedClass = new \ReflectionClass($class); |
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$parentClass = $reflectedClass->getParentClass(); |
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if (EventSourcedAggregateRoot::class !== $parentClass->getName()) { |
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throw new \InvalidArgumentException(); |
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} |
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} |
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/** |
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* @param string $class |
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* @return EventSourcedAggregateRootInterface |
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*/ |
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private function buildEmptyAggregate($class) |
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{ |
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return (new \ReflectionClass($class))->newInstanceWithoutConstructor(); |
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} |
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} |
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DDDominio /
event-sourcing
