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<?php declare(strict_types=1);
namespace Automattic\WooCommerce\Vendor\GraphQL;
use Automattic\WooCommerce\Vendor\GraphQL\Executor\Promise\Adapter\SyncPromise;
use Automattic\WooCommerce\Vendor\GraphQL\Executor\Promise\Adapter\SyncPromiseQueue;
/**
* User-facing promise class for deferred field resolution.
*
* @phpstan-type Executor callable(): mixed
*/
class Deferred extends SyncPromise
{
/**
* Executor for deferred promises.
*
* @var (callable(): mixed)|null
*/
protected $executor;
/**
* Create a new Deferred promise and enqueue its execution.
*
* @api
*
* @param Executor $executor
*/
public function __construct(callable $executor)
{
$this->executor = $executor;
SyncPromiseQueue::enqueue(function (): void {
$executor = $this->executor;
assert($executor !== null, 'Always set in constructor, this callback runs only once.');
$this->executor = null;
try {
$this->resolve($executor());
} catch (\Throwable $e) {
$this->reject($e);
}
});
}
/**
* Alias for __construct.
*
* @param Executor $executor
*
* @deprecated TODO remove in next major version, use new Deferred() instead
*/
public static function create(callable $executor): self
{
return new self($executor);
}
}