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<?php declare(strict_types=1); |
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/** |
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* This file is part of the daikon-cqrs/event-sourcing 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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namespace Daikon\EventSourcing\Aggregate; |
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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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use Daikon\Interop\Assertion; |
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use Daikon\Interop\RuntimeException; |
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use ReflectionClass; |
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abstract class AggregateRoot implements AggregateRootInterface |
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{ |
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private AggregateIdInterface $identifier; |
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private AggregateRevision $revision; |
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private DomainEventSequenceInterface $trackedEvents; |
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/** @return static */ |
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public static function reconstituteFromHistory( |
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AggregateIdInterface $aggregateId, |
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DomainEventSequenceInterface $history |
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): self { |
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$aggregateRoot = new static($aggregateId); |
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foreach ($history as $historicalEvent) { |
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$aggregateRoot = $aggregateRoot->reconstitute($historicalEvent); |
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} |
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return $aggregateRoot; |
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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 $eventOccurred): self |
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{ |
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$this->assertExpectedIdentifier($eventOccurred, $this->getIdentifier()); |
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$aggregateRoot = clone $this; |
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$aggregateRoot->revision = $aggregateRoot->revision->increment(); |
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$eventOccurred = $eventOccurred->withAggregateRevision($aggregateRoot->revision); |
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$aggregateRoot->trackedEvents = $aggregateRoot->trackedEvents->push($eventOccurred); |
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$aggregateRoot->invokeEventHandler($eventOccurred); |
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return $aggregateRoot; |
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} |
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private function reconstitute(DomainEventInterface $historicalEvent): self |
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{ |
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$this->assertExpectedIdentifier($historicalEvent, $this->getIdentifier()); |
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$aggregateRoot = clone $this; |
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$expectedAggregateRevision = $aggregateRoot->revision->increment(); |
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$this->assertExpectedRevision($historicalEvent, $expectedAggregateRevision); |
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$aggregateRoot->revision = $expectedAggregateRevision; |
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$aggregateRoot->invokeEventHandler($historicalEvent); |
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return $aggregateRoot; |
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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($event->getAggregateRevision()), sprintf( |
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"Given event revision '%s' does not match expected AR revision at '%s'.", |
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(string)$event->getAggregateRevision(), |
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(string)$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($event->getAggregateId()), sprintf( |
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"Given event identifier '%s' does not match expected AR identifier at '%s'.", |
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(string)$event->getAggregateId(), |
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(string)$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 = (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 RuntimeException( |
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sprintf("Handler '%s' is not callable on '%s'.", $handlerMethod, static::class) |
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); |
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} |
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$handler($event); |
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} |
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} |
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daikon-cqrs /
event-sourcing
