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<?php |
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declare(strict_types=1); |
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namespace BEAR\Resource\DataLoader; |
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use BEAR\Resource\Annotation\Link; |
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use BEAR\Resource\LinkType; |
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use BEAR\Resource\Types; |
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use Ray\Di\InjectorInterface; |
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use function array_values; |
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use function assert; |
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use function uri_template; |
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/** |
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* Processes DataLoader-enabled links in batch |
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* |
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* @psalm-import-type Query from Types |
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* @psalm-import-type QueryList from Types |
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* @psalm-import-type ObjectList from Types |
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*/ |
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final class DataLoaderProcessor |
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{ |
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/** @var array<class-string<DataLoaderInterface>, DataLoaderInterface> */ |
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private array $cache = []; |
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public function __construct( |
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private readonly InjectorInterface $injector, |
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) { |
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} |
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/** |
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* Process DataLoader-enabled links |
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* |
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* @param ObjectList $annotations |
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* @param QueryList $bodyList |
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* |
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* @param-out QueryList $bodyList |
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* |
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* @psalm-suppress ReferenceConstraintViolation |
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*/ |
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public function process(array $annotations, LinkType $link, array &$bodyList): void |
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{ |
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// Group URIs by DataLoader class |
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/** @var array<class-string<DataLoaderInterface>, array{annotation: Link, uris: array<int, string>}> $loaderGroups */ |
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$loaderGroups = []; |
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foreach ($annotations as $annotation) { |
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if (! $annotation instanceof Link || $annotation->crawl !== $link->key) { |
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continue; |
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} |
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if ($annotation->dataLoader === null) { |
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continue; |
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} |
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$loaderClass = $annotation->dataLoader; |
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$loaderGroups[$loaderClass] = ['annotation' => $annotation, 'uris' => []]; |
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foreach ($bodyList as $index => $body) { |
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$uri = uri_template($annotation->href, $body); |
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$loaderGroups[$loaderClass]['uris'][$index] = $uri; |
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} |
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} |
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// Execute DataLoaders and distribute results |
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foreach ($loaderGroups as $loaderClass => $group) { |
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$loader = $this->getDataLoader($loaderClass); |
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$requests = new Requests(array_values($group['uris'])); |
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$results = $loader($requests); |
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foreach ($group['uris'] as $index => $uri) { |
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/** @psalm-suppress MixedAssignment -- Results::get() returns mixed by design */ |
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$bodyList[$index][$group['annotation']->rel] = $results->get($uri); |
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} |
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} |
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} |
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/** |
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* Get or create a DataLoader instance |
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* |
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* @param class-string<DataLoaderInterface> $class |
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*/ |
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private function getDataLoader(string $class): DataLoaderInterface |
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{ |
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if (! isset($this->cache[$class])) { |
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$instance = $this->injector->getInstance($class); |
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assert($instance instanceof DataLoaderInterface); |
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$this->cache[$class] = $instance; |
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} |
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return $this->cache[$class]; |
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} |
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} |
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bearsunday /
BEAR.Resource
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