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- 27.10.2014
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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\Exception\ServiceCircularReferenceException;
15 use Symfony\Component\DependencyInjection\ContainerBuilder;
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 $currentId;
30 private $currentPath;
31 private $checkedNodes;
32
33 /**
34 * Checks the ContainerBuilder object for circular references.
35 *
36 * @param ContainerBuilder $container The ContainerBuilder instances
37 */
38 public function process(ContainerBuilder $container)
39 {
40 $graph = $container->getCompiler()->getServiceReferenceGraph();
41
42 $this->checkedNodes = array();
43 foreach ($graph->getNodes() as $id => $node) {
44 $this->currentId = $id;
45 $this->currentPath = array($id);
46
47 $this->checkOutEdges($node->getOutEdges());
48 }
49 }
50
51 /**
52 * Checks for circular references.
53 *
54 * @param ServiceReferenceGraphEdge[] $edges An array of Edges
55 *
56 * @throws ServiceCircularReferenceException When a circular reference is found.
57 */
58 private function checkOutEdges(array $edges)
59 {
60 foreach ($edges as $edge) {
61 $node = $edge->getDestNode();
62 $id = $node->getId();
63
64 if (empty($this->checkedNodes[$id])) {
65 $searchKey = array_search($id, $this->currentPath);
66 $this->currentPath[] = $id;
67
68 if (false !== $searchKey) {
69 throw new ServiceCircularReferenceException($id, array_slice($this->currentPath, $searchKey));
70 }
71
72 $this->checkOutEdges($node->getOutEdges());
73
74 $this->checkedNodes[$id] = true;
75 array_pop($this->currentPath);
76 }
77 }
78 }
79 }
80