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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of the Explicit Architecture POC, |
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* which is created on top of the Symfony Demo application. |
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* |
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* (c) Herberto Graça <[email protected]> |
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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 Acme\App\Core\Component\Blog\Application\Service; |
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use Acme\App\Core\Component\Blog\Application\Query\FindHighestPostSlugSuffixQueryInterface; |
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use Acme\App\Core\Component\Blog\Application\Query\PostSlugExistsQueryInterface; |
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use Acme\App\Core\Component\Blog\Application\Repository\PostRepositoryInterface; |
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use Acme\App\Core\Component\Blog\Domain\Post\Post; |
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use Acme\App\Core\Port\Lock\LockManagerInterface; |
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use Acme\App\Core\SharedKernel\Component\User\Domain\User\UserId; |
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final class PostService |
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{ |
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public const SLUG_LOCK_PREFIX = 'slug_creation-'; |
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/** |
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* @var PostRepositoryInterface |
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*/ |
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private $postRepository; |
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/** |
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* @var PostSlugExistsQueryInterface |
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*/ |
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private $postSlugExistsQuery; |
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/** |
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* @var FindHighestPostSlugSuffixQueryInterface |
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*/ |
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private $findHighestPostSlugSuffixQuery; |
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/** |
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* @var LockManagerInterface |
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*/ |
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private $lockManager; |
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public function __construct( |
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PostRepositoryInterface $postRepository, |
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PostSlugExistsQueryInterface $postSlugExistsQuery, |
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FindHighestPostSlugSuffixQueryInterface $findHighestPostSlugSuffixQuery, |
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LockManagerInterface $lockManager |
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) { |
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$this->postRepository = $postRepository; |
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$this->postSlugExistsQuery = $postSlugExistsQuery; |
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$this->findHighestPostSlugSuffixQuery = $findHighestPostSlugSuffixQuery; |
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$this->lockManager = $lockManager; |
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} |
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public function create(Post $post, UserId $authorId): void |
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{ |
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$post->setAuthorId($authorId); |
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// We acquire a lock on the creation of a slug here, to prevent race conditions while generating the sequential |
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// ID used to make the slug unique. |
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// We use the slug as part of the lock name so that we only block the post creation requests that try to |
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// create a post with the same slug. |
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$this->lockManager->acquire(self::SLUG_LOCK_PREFIX . $post->getSlug()); |
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if ($this->postSlugExistsQuery->execute($post->getSlug())) { |
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$highestPostSlugSuffix = $this->findHighestPostSlugSuffixQuery->execute($post->getSlug()); |
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$post->postfixSlug((string) ++$highestPostSlugSuffix); |
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} |
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$this->postRepository->add($post); |
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} |
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/** |
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* This method is quite simple, so it might seem useless to have it. However, it is debatable if we should have it |
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* or not, and several things come to my mind: |
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* On one hand, this use case can be triggered from several locations and if/when we need to change it |
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* (ie to make it a soft delete instead of a hard delete or to send out an event), we would only need to |
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* change it here. |
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* On the other hand, being so simple, we could just use the repository directly in the controllers, |
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* and move the logic to a service only if/when the logic becomes more complex. |
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* Yet on another hand, if we use a command bus, any data changes must be done through a command/handler |
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* (so they can be queued and possibly retried) and such a simple operation is no exception. |
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* |
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* For the sake of the previous explanation, I decided to leave it here. |
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*/ |
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public function delete(Post $post): void |
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{ |
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$this->postRepository->remove($post); |
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} |
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} |
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hgraca /
explicit-architecture-php
