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<?php |
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namespace NilPortugues\MessageBus\QueryBus; |
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use InvalidArgumentException; |
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use NilPortugues\MessageBus\QueryBus\Contracts\Query; |
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use NilPortugues\MessageBus\QueryBus\Contracts\QueryBusMiddleware as QueryBusMiddlewareInterface; |
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use NilPortugues\MessageBus\QueryBus\Contracts\QueryResponse; |
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use NilPortugues\MessageBus\Serializer\Contracts\Serializer; |
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use Psr\Cache\CacheItemPoolInterface; |
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class CacheQueryBusMiddleware implements QueryBusMiddlewareInterface |
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{ |
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/** @var CacheItemPoolInterface */ |
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protected $cache; |
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/** @var Serializer */ |
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protected $serializer; |
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/** @var int */ |
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protected $ttl; |
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/** |
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* CachingQueryBus constructor. |
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* |
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* @param Serializer $serializer |
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* @param CacheItemPoolInterface $cacheItemPool |
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* @param int $expirationInSeconds |
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*/ |
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public function __construct( |
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Serializer $serializer, |
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CacheItemPoolInterface $cacheItemPool, |
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int $expirationInSeconds |
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) { |
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$this->cache = $cacheItemPool; |
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$this->serializer = $serializer; |
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$this->ttl = $expirationInSeconds; |
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} |
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/** |
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* @param Query $query |
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* @param callable|null $next |
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* |
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* @return QueryResponse |
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*/ |
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public function __invoke(Query $query, callable $next = null) : QueryResponse |
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{ |
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if (null === $next) { |
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throw new InvalidArgumentException('callable $next must not be null.'); |
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} |
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$cache = $this->cache->getItem($this->queryHashing($query)); |
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if ($cache->isHit()) { |
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return $this->serializer->unserialize($cache->get()); |
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} |
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$response = $next($query); |
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$cache->set($this->serializer->serialize($response)); |
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$cache->expiresAfter($this->ttl); |
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$this->cache->save($cache); |
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return $response; |
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} |
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/** |
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* @param Query $query |
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* |
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* @return string |
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*/ |
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protected function queryHashing(Query $query) : string |
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{ |
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return md5(serialize($query)); |
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} |
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} |
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PHPMessageBus /
messagebus
