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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
declare(strict_types=1);
namespace Magento\Framework\GraphQl\Query;
use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Query\Resolver\BatchServiceContractResolverInterface;
use Magento\Framework\GraphQl\Query\Resolver\ResolveRequest;
use Magento\Framework\GraphQl\Query\Resolver\ValueFactory;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
use Magento\Framework\ObjectManagerInterface;
/**
* Default logic to make batch contract resolvers work.
*/
class BatchContractResolverWrapper implements ResolverInterface
{
/**
* @var BatchServiceContractResolverInterface
*/
private $resolver;
/**
* @var ObjectManagerInterface
*/
private $objectManager;
/**
* @var callable|null
*/
private $contract;
/**
* @var ValueFactory
*/
private $valueFactory;
/**
* @var array
*/
private $arguments = [];
/**
* @var ResolveRequest[]
*/
private $requests = [];
/**
* @var array|null
*/
private $result;
/**
* BatchContractResolverWrapper constructor.
* @param BatchServiceContractResolverInterface $resolver
* @param ObjectManagerInterface $objectManager
* @param ValueFactory $valueFactory
*/
public function __construct(
BatchServiceContractResolverInterface $resolver,
ObjectManagerInterface $objectManager,
ValueFactory $valueFactory
) {
$this->resolver = $resolver;
$this->objectManager = $objectManager;
$this->valueFactory = $valueFactory;
}
/**
* Get batch service contract instance.
*
* @return callable
*/
private function getContact(): callable
{
if (!$this->contract) {
$contractData = $this->resolver->getServiceContract();
$this->contract = [$this->objectManager->get($contractData[0]), $contractData[1]];
$this->objectManager = null;
}
return $this->contract;
}
/**
* Clear aggregated data.
*
* @return void
*/
private function clearAggregated(): void
{
$this->result = null;
$this->arguments = [];
$this->requests = [];
}
/**
* Get resolved branch/leaf for given request.
*
* @param int $i
* @throws \Throwable
* @return mixed
*/
private function getResolvedFor(int $i)
{
try {
return $this->resolveForIndex($i);
} catch (\Throwable $exception) {
$this->clearAggregated();
throw $exception;
}
}
/**
* Resolve for specified request.
*
* @param int $i
* @return mixed|\Magento\Framework\GraphQl\Query\Resolver\Value
* @throws \Magento\Framework\GraphQl\Exception\GraphQlInputException
*/
private function resolveForIndex(int $i)
{
if (!array_key_exists($i, $this->requests)) {
throw new \RuntimeException('No such resolve request.');
}
if ($this->result === null) {
$this->result = call_user_func($this->getContact(), $this->arguments);
}
if (!array_key_exists($i, $this->result)) {
throw new \RuntimeException('Service contract returned insufficient result');
}
return $this->resolver->convertFromServiceResult($this->result[$i], $this->requests[$i]);
}
/**
* @inheritDoc
*/
public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
{
if ($this->result !== null) {
$this->clearAggregated();
}
//Add argument.
$i = count($this->arguments);
$request = new ResolveRequest($field, $context, $info, $value, $args);
$this->arguments[$i] = $this->resolver->convertToServiceArgument($request);
$this->requests[$i] = $request;
return $this->valueFactory->create(
function () use ($i) {
return $this->getResolvedFor($i);
}
);
}
}