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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Contracts\Service;
use Psr\Container\ContainerInterface;
use Symfony\Contracts\Service\Attribute\Required;
use Symfony\Contracts\Service\Attribute\SubscribedService;
/**
* Implementation of ServiceSubscriberInterface that determines subscribed services
* from methods that have the #[SubscribedService] attribute.
*
* Service ids are available as "ClassName::methodName" so that the implementation
* of subscriber methods can be just `return $this->container->get(__METHOD__);`.
*
* @author Kevin Bond <kevinbond@gmail.com>
*/
trait ServiceMethodsSubscriberTrait
{
protected ContainerInterface $container;
public static function getSubscribedServices(): array
{
$services = method_exists(get_parent_class(self::class) ?: '', __FUNCTION__) ? parent::getSubscribedServices() : [];
$reflectors = [
...(new \ReflectionClass(self::class))->getMethods(),
...(new \ReflectionClass(self::class))->getProperties(),
];
foreach ($reflectors as $reflector) {
if (self::class !== $reflector->class) {
continue;
}
if (!$reflectionAttribute = $reflector->getAttributes(SubscribedService::class)[0] ?? null) {
continue;
}
if ($reflector instanceof \ReflectionMethod) {
if ($reflector->isStatic() || $reflector->isAbstract() || $reflector->isGenerator() || $reflector->isInternal() || $reflector->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, $reflector->name));
}
if (!$autowireType = $reflector->getReturnType()) {
throw new \LogicException(\sprintf('Cannot use "%s" on methods without a return type in "%s::%s()".', SubscribedService::class, $reflector->name, self::class));
}
$defaultKey = self::class.'::'.$reflector->name;
} elseif ($reflector instanceof \ReflectionProperty) {
if (\PHP_VERSION_ID < 80400 || !$reflector->hasHook(\PropertyHookType::Get)) {
throw new \LogicException(\sprintf('Cannot use "%s" on property "%s::$%s" (can only be used on properties with a get hook).', SubscribedService::class, self::class, $reflector->name));
}
if (!$autowireType = $reflector->getType()) {
throw new \LogicException(\sprintf('Cannot use "%s" on properties without a type in "%s::$%s".', SubscribedService::class, $reflector->name, self::class));
}
$defaultKey = self::class.'::$'.$reflector->name.'::get';
} else {
throw new \LogicException('Unexpected reflector: '.get_debug_type($reflector));
}
/* @var SubscribedService $attribute */
$attribute = $reflectionAttribute->newInstance();
$attribute->key ??= $defaultKey;
$attribute->type ??= $autowireType instanceof \ReflectionNamedType ? $autowireType->getName() : (string) $autowireType;
$attribute->nullable = $attribute->nullable ?: $autowireType->allowsNull();
if ($attribute->attributes) {
$services[] = $attribute;
} else {
$services[$attribute->key] = ($attribute->nullable ? '?' : '').$attribute->type;
}
}
return $services;
}
#[Required]
public function setContainer(ContainerInterface $container): ?ContainerInterface
{
$ret = null;
if (method_exists(get_parent_class(self::class) ?: '', __FUNCTION__)) {
$ret = parent::setContainer($container);
}
$this->container = $container;
return $ret;
}
}