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CheckCircularReferencesPass.php
01 <?php
02
03 /*
04 * This file is part of the Symfony package.
05 *
06 * (c) Fabien Potencier <fabien@symfony.com>
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * file that was distributed with this source code.
10 */
11
12 namespace Symfony\Component\DependencyInjection\Compiler;
13
14 use Symfony\Component\DependencyInjection\ContainerBuilder;
15 use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
16
17 /**
18 * Checks your services for circular references.
19 *
20 * References from method calls are ignored since we might be able to resolve
21 * these references depending on the order in which services are called.
22 *
23 * Circular reference from method calls will only be detected at run-time.
24 *
25 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
26 */
27 class CheckCircularReferencesPass implements CompilerPassInterface
28 {
29 private $currentPath;
30 private $checkedNodes;
31
32 /**
33 * Checks the ContainerBuilder object for circular references.
34 */
35 public function process(ContainerBuilder $container)
36 {
37 $graph = $container->getCompiler()->getServiceReferenceGraph();
38
39 $this->checkedNodes = [];
40 foreach ($graph->getNodes() as $id => $node) {
41 $this->currentPath = [$id];
42
43 $this->checkOutEdges($node->getOutEdges());
44 }
45 }
46
47 /**
48 * Checks for circular references.
49 *
50 * @param ServiceReferenceGraphEdge[] $edges An array of Edges
51 *
52 * @throws ServiceCircularReferenceException when a circular reference is found
53 */
54 private function checkOutEdges(array $edges)
55 {
56 foreach ($edges as $edge) {
57 $node = $edge->getDestNode();
58 $id = $node->getId();
59
60 if (empty($this->checkedNodes[$id])) {
61 // Don't check circular references for lazy edges
62 if (!$node->getValue() || (!$edge->isLazy() && !$edge->isWeak())) {
63 $searchKey = array_search($id, $this->currentPath);
64 $this->currentPath[] = $id;
65
66 if (false !== $searchKey) {
67 throw new ServiceCircularReferenceException($id, \array_slice($this->currentPath, $searchKey));
68 }
69
70 $this->checkOutEdges($node->getOutEdges());
71 }
72
73 $this->checkedNodes[$id] = true;
74 array_pop($this->currentPath);
75 }
76 }
77 }
78 }
79