CheckCircularReferencesPass.php in Service Container 7

Namespace

Symfony\Component\DependencyInjection\Compiler

File

modules/providers/service_container_symfony/lib/Symfony/Component/DependencyInjection/Compiler/CheckCircularReferencesPass.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[e-mail]>
 *
 * 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 <[e-mail]>
 */
class CheckCircularReferencesPass implements CompilerPassInterface {
  private $currentPath;
  private $checkedNodes;

  /**
   * Checks the ContainerBuilder object for circular references.
   *
   * @param ContainerBuilder $container The ContainerBuilder instances
   */
  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])) {
        $searchKey = array_search($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);
      }
    }
  }

}

Classes

Name	Description
CheckCircularReferencesPass	Checks your services for circular references.