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<?php |
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namespace PhpDDD\DomainDrivenDesign\Domain; |
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use PhpDDD\DomainDrivenDesign\Command\AbstractCommand; |
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use PhpDDD\DomainDrivenDesign\Command\CommandDispatcherInterface; |
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use PhpDDD\DomainDrivenDesign\Command\CommandHandlerInterface; |
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use PhpDDD\DomainDrivenDesign\Event\AbstractEvent; |
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use PhpDDD\DomainDrivenDesign\Event\EventDispatcherInterface; |
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use PhpDDD\DomainDrivenDesign\Event\EventSubscriberInterface; |
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/** |
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* The CommandEventDispatcher allows you to handle the flow from a Command to the events publication. |
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*/ |
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final class CommandEventDispatcher implements CommandDispatcherInterface, EventDispatcherInterface |
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{ |
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/** |
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* @var CommandDispatcherInterface |
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*/ |
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private $commandDispatcher; |
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/** |
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* @var EventDispatcherInterface |
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*/ |
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private $eventDispatcher; |
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/** |
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* @param CommandDispatcherInterface $commandDispatcher |
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* @param EventDispatcherInterface $eventDispatcher |
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*/ |
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public function __construct( |
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CommandDispatcherInterface $commandDispatcher, |
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EventDispatcherInterface $eventDispatcher |
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) { |
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$this->commandDispatcher = $commandDispatcher; |
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$this->eventDispatcher = $eventDispatcher; |
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} |
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/** |
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* Try to handle the command given in argument. |
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* It will look over every handlers registered and find the one that knows how handle it. |
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* |
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* @param AbstractCommand $command |
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* |
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* @return AbstractCommand |
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*/ |
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public function handle(AbstractCommand $command) |
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{ |
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$this->commandDispatcher->handle($command); |
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// Now that the command is handled, let's found if there is some events to publish |
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$events = $this->extractEventsFromCommand($command); |
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foreach ($events as $event) { |
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// we will only publish event to synchronous listeners |
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$this->publish($event); |
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} |
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return $command; |
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} |
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/** |
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* Register a CommandHandler for one or more Command. |
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* |
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* @param CommandHandlerInterface $handler |
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* |
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* @return void |
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*/ |
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public function register(CommandHandlerInterface $handler) |
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{ |
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$this->commandDispatcher->register($handler); |
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} |
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/** |
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* @param AbstractEvent $event |
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* @param bool $asynchronous |
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* |
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* @return AbstractEvent |
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*/ |
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public function publish(AbstractEvent $event, $asynchronous = false) |
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{ |
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return $this->eventDispatcher->publish($event, $asynchronous); |
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} |
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/** |
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* @param EventSubscriberInterface $subscriber |
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*/ |
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public function subscribe(EventSubscriberInterface $subscriber) |
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{ |
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$this->eventDispatcher->subscribe($subscriber); |
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} |
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/** |
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* @param AbstractCommand $command |
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* |
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* @return AbstractEvent[] |
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*/ |
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private function extractEventsFromCommand(AbstractCommand $command) |
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{ |
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$events = []; |
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foreach ($command->aggregateRoots as $aggregateRoot) { |
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$events = array_merge($events, $aggregateRoot->pullEvents()); |
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} |
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return $events; |
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} |
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} |
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php-ddd /
domain-driven-design
