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<?php |
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namespace DDDominio\EventSourcing\Common; |
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abstract class EventSourcedAggregateRoot implements EventSourcedAggregateRootInterface |
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{ |
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/** |
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* @var DomainEvent[] |
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*/ |
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private $changes = []; |
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/** |
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* @var int |
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*/ |
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private $version = 0; |
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/** |
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* @param mixed $domainEvent |
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* @throws DomainEventNotUnderstandableException |
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*/ |
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public function applyAndRecord($domainEvent) |
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{ |
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$domainEvent = $this->ensureDomainEvent($domainEvent); |
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$this->apply($domainEvent); |
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$this->record($domainEvent); |
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} |
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/** |
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* @param mixed $domainEvent |
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*/ |
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private function record($domainEvent) |
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{ |
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$this->changes[] = $domainEvent; |
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} |
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/** |
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* @param mixed $domainEvent |
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*/ |
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public function apply($domainEvent) |
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{ |
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$domainEvent = $this->ensureDomainEvent($domainEvent); |
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$eventHandlerName = $this->getEventHandlerName($domainEvent); |
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if (method_exists($this, $eventHandlerName)) { |
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$this->executeEventHandler($this, $eventHandlerName, $domainEvent); |
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} else { |
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$this->applyRecursively($eventHandlerName, $domainEvent); |
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} |
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} |
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/** |
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* @param $domainEvent |
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* @return DomainEvent |
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*/ |
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private function ensureDomainEvent($domainEvent) |
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{ |
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if (!$domainEvent instanceof DomainEvent) { |
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$domainEvent = DomainEvent::record($domainEvent); |
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} |
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return $domainEvent; |
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} |
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/** |
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* @param string $eventHandlerName |
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* @param mixed $domainEventData |
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* @throws DomainEventNotUnderstandableException |
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*/ |
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private function applyRecursively($eventHandlerName, $domainEventData) |
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{ |
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$applied = false; |
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$reflectedClass = new \ReflectionClass(get_class($this)); |
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foreach ($reflectedClass->getProperties() as $property) { |
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$propertyValue = $this->{$property->getName()}; |
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View Code Duplication |
if (is_object($propertyValue)) { |
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if (method_exists($propertyValue, $eventHandlerName)) { |
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$this->executeEventHandler($propertyValue, $eventHandlerName, $domainEventData); |
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$applied = true; |
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} |
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} |
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View Code Duplication |
if (is_array($propertyValue)) { |
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foreach ($propertyValue as $item) { |
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if (method_exists($item, $eventHandlerName)) { |
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$this->executeEventHandler($item, $eventHandlerName, $domainEventData); |
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$applied = true; |
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} |
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} |
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} |
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} |
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if (!$applied) { |
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throw DomainEventNotUnderstandableException::fromAggreagteAndEventTypes( |
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get_class($this), |
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get_class($domainEventData) |
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); |
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} |
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} |
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/** |
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* @param DomainEvent $domainEvent |
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* @return string |
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*/ |
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private function getEventHandlerName($domainEvent) |
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{ |
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return 'when' . (new \ReflectionClass($domainEvent->data()))->getShortName(); |
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} |
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/** |
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* @param object $entity |
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* @param string $eventHandlerName |
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* @param DomainEvent $domainEvent |
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*/ |
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private function executeEventHandler($entity, $eventHandlerName, $domainEvent) |
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{ |
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$entity->{$eventHandlerName}($domainEvent->data(), $domainEvent->occurredOn()); |
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$this->increaseAggregateVersion(); |
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} |
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private function increaseAggregateVersion() |
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{ |
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$this->version++; |
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} |
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/** |
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* @return DomainEvent[] |
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*/ |
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public function changes() |
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{ |
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return $this->changes; |
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} |
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/** |
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* @return int |
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*/ |
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8 |
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public function version() |
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{ |
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return $this->version; |
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} |
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/** |
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* @return int |
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*/ |
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2 |
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public function originalVersion() |
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{ |
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return $this->version - count($this->changes()); |
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} |
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7 |
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public function clearChanges() |
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{ |
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7 |
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$this->changes = []; |
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7 |
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} |
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} |
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DDDominio /
event-sourcing
Loading history...
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.