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<?php |
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declare(strict_types=1); |
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namespace RemotelyLiving\PHPCommandBus; |
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use Psr\EventDispatcher; |
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use RemotelyLiving\PHPCommandBus\Interfaces; |
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final class CommandBus implements Interfaces\CommandBus |
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{ |
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private Interfaces\Resolver $resolver; |
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private EventDispatcher\EventDispatcherInterface $eventDispatcher; |
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/** |
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* @var callable |
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*/ |
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private $callStack; |
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public function __construct( |
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Interfaces\Resolver $resolver, |
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EventDispatcher\EventDispatcherInterface $eventDispatcher = null |
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) { |
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$this->resolver = $resolver; |
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$this->eventDispatcher = $eventDispatcher ?? $this->createDummyDispatcher(); |
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$this->callStack = $this->seedCallStack(); |
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} |
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public static function create( |
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Interfaces\Resolver $resolver, |
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EventDispatcher\EventDispatcherInterface $eventDispatcher = null |
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): self { |
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return new static($resolver, $eventDispatcher); |
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} |
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public function pushMiddleware(callable $middleware): Interfaces\CommandBus |
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{ |
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$next = $this->callStack; |
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$this->callStack = function (object $command) use ($middleware, $next): void { |
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$middleware($command, $next); |
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}; |
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return $this; |
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} |
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public function handle(object $command): void |
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{ |
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($this->callStack)($command); |
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} |
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private function seedCallStack(): callable |
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{ |
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return function (object $command): void { |
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$possibleEvents = $this->resolver->resolve($command)->handle($command, $this); |
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if (!$possibleEvents || !is_iterable($possibleEvents)) { |
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return; |
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} |
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foreach ($possibleEvents as $event) { |
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$this->eventDispatcher->dispatch($event); |
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} |
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}; |
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} |
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private function createDummyDispatcher(): EventDispatcher\EventDispatcherInterface |
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{ |
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return (new class implements EventDispatcher\EventDispatcherInterface { |
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public function dispatch(object $event) |
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{ |
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return $event; |
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} |
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}); |
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} |
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} |
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remotelyliving /
php-command-bus
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