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<?php |
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declare(strict_types=1); |
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namespace RemotelyLiving\PHPQueryBus\Middleware; |
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use Psr\Cache as PSRCache; |
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use RemotelyLiving\PHPQueryBus\DTO; |
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use RemotelyLiving\PHPQueryBus\Interfaces; |
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final class QueryCacher |
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{ |
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private PSRCache\CacheItemPoolInterface $cachePool; |
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public function __construct(PSRCache\CacheItemPoolInterface $cachePool) |
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{ |
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$this->cachePool = $cachePool; |
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} |
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public function __invoke(Interfaces\Query $query, callable $next): Interfaces\Result |
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{ |
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if (!$query instanceof Interfaces\CacheableQuery) { |
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return $next($query); |
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} |
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$cachedResult = $this->cachePool->getItem($query->getCacheKey()); |
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if ($query->shouldRecomputeResult() || $this->shouldRecomputeResult($cachedResult)) { |
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return $this->recomputeResult($cachedResult, $query, $next); |
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} |
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/** @var DTO\Cache\ResultWrapper $resultWrapper */ |
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$resultWrapper = $cachedResult->get(); |
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return $resultWrapper->getResult(); |
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} |
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private function shouldRecomputeResult(PSRCache\CacheItemInterface $cacheItem): bool |
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{ |
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if (!$cacheItem->isHit()) { |
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return true; |
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} |
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if (!is_object($cacheItem->get()) || ($cacheItem->get() instanceof DTO\Cache\ResultWrapper) === false) { |
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return true; |
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} |
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/** @var DTO\Cache\ResultWrapper $wrapper */ |
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$wrapper = $cacheItem->get(); |
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return $wrapper->willProbablyExpireSoon(); |
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} |
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private function recomputeResult( |
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PSRCache\CacheItemInterface $cacheItem, |
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Interfaces\CacheableQuery $query, |
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callable $next |
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): Interfaces\Result { |
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$startTime = microtime(true); |
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/** @var Interfaces\Result $result */ |
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$result = $next($query); |
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$stopTime = microtime(true); |
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$computeTime = (int) ($stopTime - $startTime); |
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$recomputed = $cacheItem->set(DTO\Cache\ResultWrapper::wrap($result, $computeTime, $query->getTTL())) |
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->expiresAfter($query->getTTL()); |
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$this->cachePool->save($recomputed); |
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return $result; |
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} |
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} |
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remotelyliving /
php-query-bus
