81 lines
2.5 KiB
PHP
81 lines
2.5 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\DependencyInjection\Compiler;
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use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
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use Symfony\Component\DependencyInjection\ContainerBuilder;
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/**
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* Checks your services for circular references.
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*
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* References from method calls are ignored since we might be able to resolve
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* these references depending on the order in which services are called.
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*
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* Circular reference from method calls will only be detected at run-time.
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*
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* @author Johannes M. Schmitt <schmittjoh@gmail.com>
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*/
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class CheckCircularReferencesPass implements CompilerPassInterface
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{
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private $currentPath;
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private $checkedNodes;
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/**
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* Checks the ContainerBuilder object for circular references.
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*
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* @param ContainerBuilder $container The ContainerBuilder instances
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*/
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public function process(ContainerBuilder $container)
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{
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$graph = $container->getCompiler()->getServiceReferenceGraph();
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$this->checkedNodes = array();
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foreach ($graph->getNodes() as $id => $node) {
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$this->currentPath = array($id);
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$this->checkOutEdges($node->getOutEdges());
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}
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}
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/**
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* Checks for circular references.
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*
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* @param ServiceReferenceGraphEdge[] $edges An array of Edges
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*
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* @throws ServiceCircularReferenceException When a circular reference is found.
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*/
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private function checkOutEdges(array $edges)
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{
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foreach ($edges as $edge) {
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$node = $edge->getDestNode();
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$id = $node->getId();
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if (empty($this->checkedNodes[$id])) {
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// don't check circular dependencies for lazy services
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if (!$node->getValue() || !$node->getValue()->isLazy()) {
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$searchKey = array_search($id, $this->currentPath);
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$this->currentPath[] = $id;
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if (false !== $searchKey) {
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throw new ServiceCircularReferenceException($id, array_slice($this->currentPath, $searchKey));
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}
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$this->checkOutEdges($node->getOutEdges());
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}
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$this->checkedNodes[$id] = true;
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array_pop($this->currentPath);
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}
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}
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}
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}
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