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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\Component\DependencyInjection\Compiler;
use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
use Symfony\Component\DependencyInjection\ContainerBuilder;
/**
* Checks your services for circular references.
*
* References from method calls are ignored since we might be able to resolve
* these references depending on the order in which services are called.
*
* Circular reference from method calls will only be detected at run-time.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
class CheckCircularReferencesPass implements CompilerPassInterface
{
private $currentPath;
private $checkedNodes;
/**
* Checks the ContainerBuilder object for circular references.
*/
public function process(ContainerBuilder $container)
{
$graph = $container->getCompiler()->getServiceReferenceGraph();
$this->checkedNodes = array();
foreach ($graph->getNodes() as $id => $node) {
$this->currentPath = array($id);
$this->checkOutEdges($node->getOutEdges());
}
}
/**
* Checks for circular references.
*
* @param ServiceReferenceGraphEdge[] $edges An array of Edges
*
* @throws ServiceCircularReferenceException when a circular reference is found
*/
private function checkOutEdges(array $edges)
{
foreach ($edges as $edge) {
$node = $edge->getDestNode();
$id = $node->getId();
if (empty($this->checkedNodes[$id])) {
// Don't check circular references for lazy edges
if (!$node->getValue() || (!$edge->isLazy() && !$edge->isWeak())) {
$searchKey = array_search($id, $this->currentPath);
$this->currentPath[] = $id;
if (false !== $searchKey) {
throw new ServiceCircularReferenceException($id, array_slice($this->currentPath, $searchKey));
}
$this->checkOutEdges($node->getOutEdges());
}
$this->checkedNodes[$id] = true;
array_pop($this->currentPath);
}
}
}
}