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- 27.04.2026
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ServiceLocator.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\DependencyInjection;
013
014 use Psr\Container\ContainerInterface as PsrContainerInterface;
015 use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
016 use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
017
018 /**
019 * @author Robin Chalas <robin.chalas@gmail.com>
020 * @author Nicolas Grekas <p@tchwork.com>
021 */
022 class ServiceLocator implements PsrContainerInterface
023 {
024 private $factories;
025 private $loading = [];
026 private $externalId;
027 private $container;
028
029 /**
030 * @param callable[] $factories
031 */
032 public function __construct(array $factories)
033 {
034 $this->factories = $factories;
035 }
036
037 /**
038 * {@inheritdoc}
039 */
040 public function has($id)
041 {
042 return isset($this->factories[$id]);
043 }
044
045 /**
046 * {@inheritdoc}
047 */
048 public function get($id)
049 {
050 if (!isset($this->factories[$id])) {
051 throw new ServiceNotFoundException($id, end($this->loading) ?: null, null, [], $this->createServiceNotFoundMessage($id));
052 }
053
054 if (isset($this->loading[$id])) {
055 $ids = array_values($this->loading);
056 $ids = \array_slice($this->loading, array_search($id, $ids));
057 $ids[] = $id;
058
059 throw new ServiceCircularReferenceException($id, $ids);
060 }
061
062 $this->loading[$id] = $id;
063 try {
064 return $this->factories[$id]();
065 } finally {
066 unset($this->loading[$id]);
067 }
068 }
069
070 public function __invoke($id)
071 {
072 return isset($this->factories[$id]) ? $this->get($id) : null;
073 }
074
075 /**
076 * @internal
077 */
078 public function withContext($externalId, Container $container)
079 {
080 $locator = clone $this;
081 $locator->externalId = $externalId;
082 $locator->container = $container;
083
084 return $locator;
085 }
086
087 private function createServiceNotFoundMessage($id)
088 {
089 if ($this->loading) {
090 return sprintf('The service "%s" has a dependency on a non-existent service "%s". This locator %s', end($this->loading), $id, $this->formatAlternatives());
091 }
092
093 $class = debug_backtrace(\DEBUG_BACKTRACE_PROVIDE_OBJECT | \DEBUG_BACKTRACE_IGNORE_ARGS, 3);
094 $class = isset($class[2]['object']) ? \get_class($class[2]['object']) : null;
095 $externalId = $this->externalId ?: $class;
096
097 $msg = [];
098 $msg[] = sprintf('Service "%s" not found:', $id);
099
100 if (!$this->container) {
101 $class = null;
102 } elseif ($this->container->has($id) || isset($this->container->getRemovedIds()[$id])) {
103 $msg[] = 'even though it exists in the app\'s container,';
104 } else {
105 try {
106 $this->container->get($id);
107 $class = null;
108 } catch (ServiceNotFoundException $e) {
109 if ($e->getAlternatives()) {
110 $msg[] = sprintf('did you mean %s? Anyway,', $this->formatAlternatives($e->getAlternatives(), 'or'));
111 } else {
112 $class = null;
113 }
114 }
115 }
116 if ($externalId) {
117 $msg[] = sprintf('the container inside "%s" is a smaller service locator that %s', $externalId, $this->formatAlternatives());
118 } else {
119 $msg[] = sprintf('the current service locator %s', $this->formatAlternatives());
120 }
121
122 if (!$class) {
123 // no-op
124 } elseif (is_subclass_of($class, ServiceSubscriberInterface::class)) {
125 $msg[] = sprintf('Unless you need extra laziness, try using dependency injection instead. Otherwise, you need to declare it using "%s::getSubscribedServices()".', preg_replace('/([^\\\\]++\\\\)++/', '', $class));
126 } else {
127 $msg[] = 'Try using dependency injection instead.';
128 }
129
130 return implode(' ', $msg);
131 }
132
133 private function formatAlternatives(array $alternatives = null, $separator = 'and')
134 {
135 $format = '"%s"%s';
136 if (null === $alternatives) {
137 if (!$alternatives = array_keys($this->factories)) {
138 return 'is empty...';
139 }
140 $format = sprintf('only knows about the %s service%s.', $format, 1 < \count($alternatives) ? 's' : '');
141 }
142 $last = array_pop($alternatives);
143
144 return sprintf($format, $alternatives ? implode('", "', $alternatives) : $last, $alternatives ? sprintf(' %s "%s"', $separator, $last) : '');
145 }
146 }
147