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<?php |
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/** |
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* This file is part of the daikon-cqrs/cqrs project. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Daikon\EventSourcing\Aggregate; |
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use Assert\Assertion; |
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use Daikon\EventSourcing\Aggregate\Event\DomainEventInterface; |
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use Daikon\EventSourcing\Aggregate\Event\DomainEventSequence; |
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use Daikon\EventSourcing\Aggregate\Event\DomainEventSequenceInterface; |
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trait AggregateRootTrait |
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{ |
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/** @var AggregateIdInterface */ |
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private $identifier; |
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/** @var AggregateRevision */ |
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private $revision; |
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/** @var DomainEventSequenceInterface */ |
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private $trackedEvents; |
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public static function reconstituteFromHistory( |
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AggregateIdInterface $aggregateId, |
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DomainEventSequenceInterface $history |
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): AggregateRootInterface { |
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$aggRoot = new static($aggregateId); |
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foreach ($history as $historicalEvent) { |
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$aggRoot = $aggRoot->reconstitute($historicalEvent); |
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} |
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return $aggRoot; |
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} |
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public function getIdentifier(): AggregateIdInterface |
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{ |
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return $this->identifier; |
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} |
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public function getRevision(): AggregateRevision |
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{ |
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return $this->revision; |
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} |
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public function getTrackedEvents(): DomainEventSequenceInterface |
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{ |
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return $this->trackedEvents; |
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} |
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protected function __construct(AggregateIdInterface $aggregateId) |
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{ |
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$this->identifier = $aggregateId; |
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$this->revision = AggregateRevision::makeEmpty(); |
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$this->trackedEvents = DomainEventSequence::makeEmpty(); |
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} |
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protected function reflectThat(DomainEventInterface $eventOccured): AggregateRootInterface |
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{ |
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$this->assertExpectedIdentifier($eventOccured, $this->getIdentifier()); |
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$aggRoot = clone $this; |
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$aggRoot->revision = $aggRoot->revision->increment(); |
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$eventOccured = $eventOccured->withAggregateRevision($aggRoot->revision); |
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$aggRoot->trackedEvents = $aggRoot->trackedEvents->push($eventOccured); |
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$aggRoot->invokeEventHandler($eventOccured); |
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return $aggRoot; |
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} |
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private function reconstitute(DomainEventInterface $historicalEvent): AggregateRootInterface |
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{ |
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$this->assertExpectedIdentifier($historicalEvent, $this->getIdentifier()); |
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$aggRoot = clone $this; |
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$expectedAggregateRevision = $aggRoot->revision->increment(); |
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$this->assertExpectedRevision($historicalEvent, $expectedAggregateRevision); |
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$aggRoot->revision = $expectedAggregateRevision; |
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$aggRoot->invokeEventHandler($historicalEvent); |
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return $aggRoot; |
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} |
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private function assertExpectedRevision(DomainEventInterface $event, AggregateRevision $expectedRevision): void |
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{ |
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Assertion::true($expectedRevision->equals($event->getAggregateRevision()), sprintf( |
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'Given event-revision %s does not match expected AR revision at %s', |
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$event->getAggregateRevision(), |
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$expectedRevision |
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)); |
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} |
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private function assertExpectedIdentifier(DomainEventInterface $event, AggregateIdInterface $expectedId): void |
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{ |
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Assertion::true($expectedId->equals($event->getAggregateId()), sprintf( |
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'Given event-identifier %s does not match expected AR identifier at %s', |
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$event->getAggregateId(), |
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$expectedId |
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)); |
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} |
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private function invokeEventHandler(DomainEventInterface $event): void |
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{ |
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$handlerName = preg_replace('/Event$/', '', (new \ReflectionClass($event))->getShortName()); |
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$handlerMethod = 'when'.ucfirst($handlerName); |
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$handler = [ $this, $handlerMethod ]; |
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if (!is_callable($handler)) { |
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throw new \Exception(sprintf('Handler "%s" is not callable on '.static::class, $handlerMethod)); |
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} |
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call_user_func($handler, $event); |
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} |
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} |
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daikon-cqrs /
event-sourcing
