<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\EventDispatcher\Debug;
use Psr\Log\LoggerInterface;
use Symfony\Component\EventDispatcher\Event;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Stopwatch\Stopwatch;
/**
* Collects some data about event listeners.
*
* This event dispatcher delegates the dispatching to another one.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class TraceableEventDispatcher implements TraceableEventDispatcherInterface
{
protected $logger;
protected $stopwatch;
private $callStack;
private $dispatcher;
private $wrappedListeners;
public function __construct(EventDispatcherInterface $dispatcher, Stopwatch $stopwatch, LoggerInterface $logger = null)
{
$this->dispatcher = $dispatcher;
$this->stopwatch = $stopwatch;
$this->logger = $logger;
$this->wrappedListeners = [];
}
/**
* {@inheritdoc}
*/
public function addListener($eventName, $listener, $priority = 0)
{
$this->dispatcher->addListener($eventName, $listener, $priority);
}
/**
* {@inheritdoc}
*/
public function addSubscriber(EventSubscriberInterface $subscriber)
{
$this->dispatcher->addSubscriber($subscriber);
}
/**
* {@inheritdoc}
*/
public function removeListener($eventName, $listener)
{
if (isset($this->wrappedListeners[$eventName])) {
foreach ($this->wrappedListeners[$eventName] as $index => $wrappedListener) {
if ($wrappedListener->getWrappedListener() === $listener) {
$listener = $wrappedListener;
unset($this->wrappedListeners[$eventName][$index]);
break;
}
}
}
return $this->dispatcher->removeListener($eventName, $listener);
}
/**
* {@inheritdoc}
*/
public function removeSubscriber(EventSubscriberInterface $subscriber)
{
return $this->dispatcher->removeSubscriber($subscriber);
}
/**
* {@inheritdoc}
*/
public function getListeners($eventName = null)
{
return $this->dispatcher->getListeners($eventName);
}
/**
* {@inheritdoc}
*/
public function getListenerPriority($eventName, $listener)
{
// we might have wrapped listeners for the event (if called while dispatching)
// in that case get the priority by wrapper
if (isset($this->wrappedListeners[$eventName])) {
foreach ($this->wrappedListeners[$eventName] as $index => $wrappedListener) {
if ($wrappedListener->getWrappedListener() === $listener) {
return $this->dispatcher->getListenerPriority($eventName, $wrappedListener);
}
}
}
return $this->dispatcher->getListenerPriority($eventName, $listener);
}
/**
* {@inheritdoc}
*/
public function hasListeners($eventName = null)
{
return $this->dispatcher->hasListeners($eventName);
}
/**
* {@inheritdoc}
*/
public function dispatch($eventName, Event $event = null)
{
if (null === $this->callStack) {
$this->callStack = new \SplObjectStorage();
}
if (null === $event) {
$event = new Event();
}
if (null !== $this->logger && $event->isPropagationStopped()) {
$this->logger->debug(sprintf('The "%s" event is already stopped. No listeners have been called.', $eventName));
}
$this->preProcess($eventName);
try {
$this->preDispatch($eventName, $event);
try {
$e = $this->stopwatch->start($eventName, 'section');
try {
$this->dispatcher->dispatch($eventName, $event);
} finally {
if ($e->isStarted()) {
$e->stop();
}
}
} finally {
$this->postDispatch($eventName, $event);
}
} finally {
$this->postProcess($eventName);
}
return $event;
}
/**
* {@inheritdoc}
*/
public function getCalledListeners()
{
if (null === $this->callStack) {
return [];
}
$called = [];
foreach ($this->callStack as $listener) {
list($eventName) = $this->callStack->getInfo();
$called[] = $listener->getInfo($eventName);
}
return $called;
}
/**
* {@inheritdoc}
*/
public function getNotCalledListeners()
{
try {
$allListeners = $this->getListeners();
} catch (\Exception $e) {
if (null !== $this->logger) {
$this->logger->info('An exception was thrown while getting the uncalled listeners.', ['exception' => $e]);
}
// unable to retrieve the uncalled listeners
return [];
}
$calledListeners = [];
if (null !== $this->callStack) {
foreach ($this->callStack as $calledListener) {
$calledListeners[] = $calledListener->getWrappedListener();
}
}
$notCalled = [];
foreach ($allListeners as $eventName => $listeners) {
foreach ($listeners as $listener) {
if (!\in_array($listener, $calledListeners, true)) {
if (!$listener instanceof WrappedListener) {
$listener = new WrappedListener($listener, null, $this->stopwatch, $this);
}
$notCalled[] = $listener->getInfo($eventName);
}
}
}
uasort($notCalled, [$this, 'sortNotCalledListeners']);
return $notCalled;
}
public function reset()
{
$this->callStack = null;
}
/**
* Proxies all method calls to the original event dispatcher.
*
* @param string $method The method name
* @param array $arguments The method arguments
*
* @return mixed
*/
public function __call($method, $arguments)
{
return \call_user_func_array([$this->dispatcher, $method], $arguments);
}
/**
* Called before dispatching the event.
*
* @param string $eventName The event name
* @param Event $event The event
*/
protected function preDispatch($eventName, Event $event)
{
}
/**
* Called after dispatching the event.
*
* @param string $eventName The event name
* @param Event $event The event
*/
protected function postDispatch($eventName, Event $event)
{
}
private function preProcess($eventName)
{
foreach ($this->dispatcher->getListeners($eventName) as $listener) {
$priority = $this->getListenerPriority($eventName, $listener);
$wrappedListener = new WrappedListener($listener instanceof WrappedListener ? $listener->getWrappedListener() : $listener, null, $this->stopwatch, $this);
$this->wrappedListeners[$eventName][] = $wrappedListener;
$this->dispatcher->removeListener($eventName, $listener);
$this->dispatcher->addListener($eventName, $wrappedListener, $priority);
$this->callStack->attach($wrappedListener, [$eventName]);
}
}
private function postProcess($eventName)
{
unset($this->wrappedListeners[$eventName]);
$skipped = false;
foreach ($this->dispatcher->getListeners($eventName) as $listener) {
if (!$listener instanceof WrappedListener) { // #12845: a new listener was added during dispatch.
continue;
}
// Unwrap listener
$priority = $this->getListenerPriority($eventName, $listener);
$this->dispatcher->removeListener($eventName, $listener);
$this->dispatcher->addListener($eventName, $listener->getWrappedListener(), $priority);
if (null !== $this->logger) {
$context = ['event' => $eventName, 'listener' => $listener->getPretty()];
}
if ($listener->wasCalled()) {
if (null !== $this->logger) {
$this->logger->debug('Notified event "{event}" to listener "{listener}".', $context);
}
} else {
$this->callStack->detach($listener);
}
if (null !== $this->logger && $skipped) {
$this->logger->debug('Listener "{listener}" was not called for event "{event}".', $context);
}
if ($listener->stoppedPropagation()) {
if (null !== $this->logger) {
$this->logger->debug('Listener "{listener}" stopped propagation of the event "{event}".', $context);
}
$skipped = true;
}
}
}
private function sortNotCalledListeners(array $a, array $b)
{
if (0 !== $cmp = strcmp($a['event'], $b['event'])) {
return $cmp;
}
if (\is_int($a['priority']) && !\is_int($b['priority'])) {
return 1;
}
if (!\is_int($a['priority']) && \is_int($b['priority'])) {
return -1;
}
if ($a['priority'] === $b['priority']) {
return 0;
}
if ($a['priority'] > $b['priority']) {
return -1;
}
return 1;
}
}