<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* 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 Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\EventDispatcher\Event;
use Symfony\Component\Stopwatch\Stopwatch;
use Psr\Log\LoggerInterface;
/**
* Collects some data about event listeners.
*
* This event dispatcher delegates the dispatching to another one.
*
* @author Fabien Potencier <[email protected]>
*/
class TraceableEventDispatcher implements TraceableEventDispatcherInterface
{
protected $logger;
protected $stopwatch;
private $called;
private $dispatcher;
private $wrappedListeners;
/**
* Constructor.
*
* @param EventDispatcherInterface $dispatcher An EventDispatcherInterface instance
* @param Stopwatch $stopwatch A Stopwatch instance
* @param LoggerInterface $logger A LoggerInterface instance
*/
public function __construct(EventDispatcherInterface $dispatcher, Stopwatch $stopwatch, LoggerInterface $logger = null)
{
$this->dispatcher = $dispatcher;
$this->stopwatch = $stopwatch;
$this->logger = $logger;
$this->called = array();
$this->wrappedListeners = array();
}
/**
* {@inheritdoc}
*/
public function addListener($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)
{
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 === $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);
$this->preDispatch($eventName, $event);
$e = $this->stopwatch->start($eventName, 'section');
$this->dispatcher->dispatch($eventName, $event);
if ($e->isStarted()) {
$e->stop();
}
$this->postDispatch($eventName, $event);
$this->postProcess($eventName);
return $event;
}
/**
* {@inheritdoc}
*/
public function getCalledListeners()
{
$called = array();
foreach ($this->called as $eventName => $listeners) {
foreach ($listeners as $listener) {
$called[$eventName.'.'.$listener->getPretty()] = $listener->getInfo($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.', array('exception' => $e));
}
// unable to retrieve the uncalled listeners
return array();
}
$notCalled = array();
foreach ($allListeners as $eventName => $listeners) {
foreach ($listeners as $listener) {
$called = false;
if (isset($this->called[$eventName])) {
foreach ($this->called[$eventName] as $l) {
if ($l->getWrappedListener() === $listener) {
$called = true;
break;
}
}
}
if (!$called) {
if (!$listener instanceof WrappedListener) {
$listener = new WrappedListener($listener, null, $this->stopwatch, $this);
}
$notCalled[$eventName.'.'.$listener->getPretty()] = $listener->getInfo($eventName);
}
}
}
uasort($notCalled, array($this, 'sortListenersByPriority'));
return $notCalled;
}
/**
* 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, $arguments)
{
return call_user_func_array(array($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, null, $this->stopwatch, $this);
$this->wrappedListeners[$eventName][] = $wrappedListener;
$this->dispatcher->removeListener($eventName, $listener);
$this->dispatcher->addListener($eventName, $wrappedListener, $priority);
}
}
private function postProcess($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 = array('event' => $eventName, 'listener' => $listener->getPretty());
}
if ($listener->wasCalled()) {
if (null !== $this->logger) {
$this->logger->debug('Notified event "{event}" to listener "{listener}".', $context);
}
if (!isset($this->called[$eventName])) {
$this->called[$eventName] = new \SplObjectStorage();
}
$this->called[$eventName]->attach($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);
}
$skipped = true;
}
}
}
private function sortListenersByPriority($a, $b)
{
if (is_int($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;
}
}