function ServiceSubscriberTrait::getSubscribedServices

File

vendor/symfony/service-contracts/ServiceSubscriberTrait.php, line 35

Class

ServiceSubscriberTrait

Implementation of ServiceSubscriberInterface that determines subscribed services from methods that have the #[SubscribedService] attribute.

Namespace

Symfony\Contracts\Service

Code

public static function getSubscribedServices() : array {
    $services = method_exists(get_parent_class(self::class) ?: '', __FUNCTION__) ? parent::getSubscribedServices() : [];
    foreach ((new \ReflectionClass(self::class))->getMethods() as $method) {
        if (self::class !== $method->getDeclaringClass()->name) {
            continue;
        }
        if (!($attribute = $method->getAttributes(SubscribedService::class)[0] ?? null)) {
            continue;
        }
        if ($method->isStatic() || $method->isAbstract() || $method->isGenerator() || $method->isInternal() || $method->getNumberOfRequiredParameters()) {
            throw new \LogicException(sprintf('Cannot use "%s" on method "%s::%s()" (can only be used on non-static, non-abstract methods with no parameters).', SubscribedService::class, self::class, $method->name));
        }
        if (!($returnType = $method->getReturnType())) {
            throw new \LogicException(sprintf('Cannot use "%s" on methods without a return type in "%s::%s()".', SubscribedService::class, $method->name, self::class));
        }
        
        /* @var SubscribedService $attribute */
        $attribute = $attribute->newInstance();
        $attribute->key ??= self::class . '::' . $method->name;
        $attribute->type ??= $returnType instanceof \ReflectionNamedType ? $returnType->getName() : (string) $returnType;
        $attribute->nullable = $returnType->allowsNull();
        if ($attribute->attributes) {
            $services[] = $attribute;
        }
        else {
            $services[$attribute->key] = ($attribute->nullable ? '?' : '') . $attribute->type;
        }
    }
    return $services;
}