vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php line 145

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  1. <?php
  2. /*
  3.  * This file is part of the Symfony package.
  4.  *
  5.  * (c) Fabien Potencier <fabien@symfony.com>
  6.  *
  7.  * For the full copyright and license information, please view the LICENSE
  8.  * file that was distributed with this source code.
  9.  */
  10. namespace Symfony\Component\EventDispatcher\Debug;
  11. use Psr\Log\LoggerInterface;
  12. use Symfony\Component\EventDispatcher\Event;
  13. use Symfony\Component\EventDispatcher\EventDispatcherInterface;
  14. use Symfony\Component\EventDispatcher\EventSubscriberInterface;
  15. use Symfony\Component\Stopwatch\Stopwatch;
  16. /**
  17.  * Collects some data about event listeners.
  18.  *
  19.  * This event dispatcher delegates the dispatching to another one.
  20.  *
  21.  * @author Fabien Potencier <fabien@symfony.com>
  22.  */
  23. class TraceableEventDispatcher implements TraceableEventDispatcherInterface
  24. {
  25.     protected $logger;
  26.     protected $stopwatch;
  27.     private $callStack;
  28.     private $dispatcher;
  29.     private $wrappedListeners;
  30.     private $orphanedEvents;
  31.     public function __construct(EventDispatcherInterface $dispatcherStopwatch $stopwatchLoggerInterface $logger null)
  32.     {
  33.         $this->dispatcher $dispatcher;
  34.         $this->stopwatch $stopwatch;
  35.         $this->logger $logger;
  36.         $this->wrappedListeners = [];
  37.         $this->orphanedEvents = [];
  38.     }
  39.     /**
  40.      * {@inheritdoc}
  41.      */
  42.     public function addListener($eventName$listener$priority 0)
  43.     {
  44.         $this->dispatcher->addListener($eventName$listener$priority);
  45.     }
  46.     /**
  47.      * {@inheritdoc}
  48.      */
  49.     public function addSubscriber(EventSubscriberInterface $subscriber)
  50.     {
  51.         $this->dispatcher->addSubscriber($subscriber);
  52.     }
  53.     /**
  54.      * {@inheritdoc}
  55.      */
  56.     public function removeListener($eventName$listener)
  57.     {
  58.         if (isset($this->wrappedListeners[$eventName])) {
  59.             foreach ($this->wrappedListeners[$eventName] as $index => $wrappedListener) {
  60.                 if ($wrappedListener->getWrappedListener() === $listener) {
  61.                     $listener $wrappedListener;
  62.                     unset($this->wrappedListeners[$eventName][$index]);
  63.                     break;
  64.                 }
  65.             }
  66.         }
  67.         return $this->dispatcher->removeListener($eventName$listener);
  68.     }
  69.     /**
  70.      * {@inheritdoc}
  71.      */
  72.     public function removeSubscriber(EventSubscriberInterface $subscriber)
  73.     {
  74.         return $this->dispatcher->removeSubscriber($subscriber);
  75.     }
  76.     /**
  77.      * {@inheritdoc}
  78.      */
  79.     public function getListeners($eventName null)
  80.     {
  81.         return $this->dispatcher->getListeners($eventName);
  82.     }
  83.     /**
  84.      * {@inheritdoc}
  85.      */
  86.     public function getListenerPriority($eventName$listener)
  87.     {
  88.         // we might have wrapped listeners for the event (if called while dispatching)
  89.         // in that case get the priority by wrapper
  90.         if (isset($this->wrappedListeners[$eventName])) {
  91.             foreach ($this->wrappedListeners[$eventName] as $index => $wrappedListener) {
  92.                 if ($wrappedListener->getWrappedListener() === $listener) {
  93.                     return $this->dispatcher->getListenerPriority($eventName$wrappedListener);
  94.                 }
  95.             }
  96.         }
  97.         return $this->dispatcher->getListenerPriority($eventName$listener);
  98.     }
  99.     /**
  100.      * {@inheritdoc}
  101.      */
  102.     public function hasListeners($eventName null)
  103.     {
  104.         return $this->dispatcher->hasListeners($eventName);
  105.     }
  106.     /**
  107.      * {@inheritdoc}
  108.      */
  109.     public function dispatch($eventNameEvent $event null)
  110.     {
  111.         if (null === $this->callStack) {
  112.             $this->callStack = new \SplObjectStorage();
  113.         }
  114.         if (null === $event) {
  115.             $event = new Event();
  116.         }
  117.         if (null !== $this->logger && $event->isPropagationStopped()) {
  118.             $this->logger->debug(sprintf('The "%s" event is already stopped. No listeners have been called.'$eventName));
  119.         }
  120.         $this->preProcess($eventName);
  121.         try {
  122.             $this->preDispatch($eventName$event);
  123.             try {
  124.                 $e $this->stopwatch->start($eventName'section');
  125.                 try {
  126.                     $this->dispatcher->dispatch($eventName$event);
  127.                 } finally {
  128.                     if ($e->isStarted()) {
  129.                         $e->stop();
  130.                     }
  131.                 }
  132.             } finally {
  133.                 $this->postDispatch($eventName$event);
  134.             }
  135.         } finally {
  136.             $this->postProcess($eventName);
  137.         }
  138.         return $event;
  139.     }
  140.     /**
  141.      * {@inheritdoc}
  142.      */
  143.     public function getCalledListeners()
  144.     {
  145.         if (null === $this->callStack) {
  146.             return [];
  147.         }
  148.         $called = [];
  149.         foreach ($this->callStack as $listener) {
  150.             list($eventName) = $this->callStack->getInfo();
  151.             $called[] = $listener->getInfo($eventName);
  152.         }
  153.         return $called;
  154.     }
  155.     /**
  156.      * {@inheritdoc}
  157.      */
  158.     public function getNotCalledListeners()
  159.     {
  160.         try {
  161.             $allListeners $this->getListeners();
  162.         } catch (\Exception $e) {
  163.             if (null !== $this->logger) {
  164.                 $this->logger->info('An exception was thrown while getting the uncalled listeners.', ['exception' => $e]);
  165.             }
  166.             // unable to retrieve the uncalled listeners
  167.             return [];
  168.         }
  169.         $notCalled = [];
  170.         foreach ($allListeners as $eventName => $listeners) {
  171.             foreach ($listeners as $listener) {
  172.                 $called false;
  173.                 if (null !== $this->callStack) {
  174.                     foreach ($this->callStack as $calledListener) {
  175.                         if ($calledListener->getWrappedListener() === $listener) {
  176.                             $called true;
  177.                             break;
  178.                         }
  179.                     }
  180.                 }
  181.                 if (!$called) {
  182.                     if (!$listener instanceof WrappedListener) {
  183.                         $listener = new WrappedListener($listenernull$this->stopwatch$this);
  184.                     }
  185.                     $notCalled[] = $listener->getInfo($eventName);
  186.                 }
  187.             }
  188.         }
  189.         uasort($notCalled, [$this'sortNotCalledListeners']);
  190.         return $notCalled;
  191.     }
  192.     public function getOrphanedEvents(): array
  193.     {
  194.         return $this->orphanedEvents;
  195.     }
  196.     public function reset()
  197.     {
  198.         $this->callStack null;
  199.         $this->orphanedEvents = [];
  200.     }
  201.     /**
  202.      * Proxies all method calls to the original event dispatcher.
  203.      *
  204.      * @param string $method    The method name
  205.      * @param array  $arguments The method arguments
  206.      *
  207.      * @return mixed
  208.      */
  209.     public function __call($method$arguments)
  210.     {
  211.         return $this->dispatcher->{$method}(...$arguments);
  212.     }
  213.     /**
  214.      * Called before dispatching the event.
  215.      *
  216.      * @param string $eventName The event name
  217.      * @param Event  $event     The event
  218.      */
  219.     protected function preDispatch($eventNameEvent $event)
  220.     {
  221.     }
  222.     /**
  223.      * Called after dispatching the event.
  224.      *
  225.      * @param string $eventName The event name
  226.      * @param Event  $event     The event
  227.      */
  228.     protected function postDispatch($eventNameEvent $event)
  229.     {
  230.     }
  231.     private function preProcess($eventName)
  232.     {
  233.         if (!$this->dispatcher->hasListeners($eventName)) {
  234.             $this->orphanedEvents[] = $eventName;
  235.             return;
  236.         }
  237.         foreach ($this->dispatcher->getListeners($eventName) as $listener) {
  238.             $priority $this->getListenerPriority($eventName$listener);
  239.             $wrappedListener = new WrappedListener($listener instanceof WrappedListener $listener->getWrappedListener() : $listenernull$this->stopwatch$this);
  240.             $this->wrappedListeners[$eventName][] = $wrappedListener;
  241.             $this->dispatcher->removeListener($eventName$listener);
  242.             $this->dispatcher->addListener($eventName$wrappedListener$priority);
  243.             $this->callStack->attach($wrappedListener, [$eventName]);
  244.         }
  245.     }
  246.     private function postProcess($eventName)
  247.     {
  248.         unset($this->wrappedListeners[$eventName]);
  249.         $skipped false;
  250.         foreach ($this->dispatcher->getListeners($eventName) as $listener) {
  251.             if (!$listener instanceof WrappedListener) { // #12845: a new listener was added during dispatch.
  252.                 continue;
  253.             }
  254.             // Unwrap listener
  255.             $priority $this->getListenerPriority($eventName$listener);
  256.             $this->dispatcher->removeListener($eventName$listener);
  257.             $this->dispatcher->addListener($eventName$listener->getWrappedListener(), $priority);
  258.             if (null !== $this->logger) {
  259.                 $context = ['event' => $eventName'listener' => $listener->getPretty()];
  260.             }
  261.             if ($listener->wasCalled()) {
  262.                 if (null !== $this->logger) {
  263.                     $this->logger->debug('Notified event "{event}" to listener "{listener}".'$context);
  264.                 }
  265.             } else {
  266.                 $this->callStack->detach($listener);
  267.             }
  268.             if (null !== $this->logger && $skipped) {
  269.                 $this->logger->debug('Listener "{listener}" was not called for event "{event}".'$context);
  270.             }
  271.             if ($listener->stoppedPropagation()) {
  272.                 if (null !== $this->logger) {
  273.                     $this->logger->debug('Listener "{listener}" stopped propagation of the event "{event}".'$context);
  274.                 }
  275.                 $skipped true;
  276.             }
  277.         }
  278.     }
  279.     private function sortNotCalledListeners(array $a, array $b)
  280.     {
  281.         if (!== $cmp strcmp($a['event'], $b['event'])) {
  282.             return $cmp;
  283.         }
  284.         if (\is_int($a['priority']) && !\is_int($b['priority'])) {
  285.             return 1;
  286.         }
  287.         if (!\is_int($a['priority']) && \is_int($b['priority'])) {
  288.             return -1;
  289.         }
  290.         if ($a['priority'] === $b['priority']) {
  291.             return 0;
  292.         }
  293.         if ($a['priority'] > $b['priority']) {
  294.             return -1;
  295.         }
  296.         return 1;
  297.     }
  298. }