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TraceableEventDispatcher.php
01 <?php
02
03 /*
04 * This file is part of the Symfony package.
05 *
06 * (c) Fabien Potencier <fabien@symfony.com>
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * file that was distributed with this source code.
10 */
11
12 namespace Symfony\Component\HttpKernel\Debug;
13
14 use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher as BaseTraceableEventDispatcher;
15 use Symfony\Component\EventDispatcher\Event;
16 use Symfony\Component\HttpKernel\KernelEvents;
17
18 /**
19 * Collects some data about event listeners.
20 *
21 * This event dispatcher delegates the dispatching to another one.
22 *
23 * @author Fabien Potencier <fabien@symfony.com>
24 */
25 class TraceableEventDispatcher extends BaseTraceableEventDispatcher
26 {
27 /**
28 * {@inheritdoc}
29 */
30 protected function preDispatch($eventName, Event $event)
31 {
32 switch ($eventName) {
33 case KernelEvents::REQUEST:
34 $this->stopwatch->openSection();
35 break;
36 case KernelEvents::VIEW:
37 case KernelEvents::RESPONSE:
38 // stop only if a controller has been executed
39 if ($this->stopwatch->isStarted('controller')) {
40 $this->stopwatch->stop('controller');
41 }
42 break;
43 case KernelEvents::TERMINATE:
44 $token = $event->getResponse()->headers->get('X-Debug-Token');
45 if (null === $token) {
46 break;
47 }
48 // There is a very special case when using built-in AppCache class as kernel wrapper, in the case
49 // of an ESI request leading to a `stale` response [B] inside a `fresh` cached response [A].
50 // In this case, `$token` contains the [B] debug token, but the open `stopwatch` section ID
51 // is equal to the [A] debug token. Trying to reopen section with the [B] token throws an exception
52 // which must be caught.
53 try {
54 $this->stopwatch->openSection($token);
55 } catch (\LogicException $e) {
56 }
57 break;
58 }
59 }
60
61 /**
62 * {@inheritdoc}
63 */
64 protected function postDispatch($eventName, Event $event)
65 {
66 switch ($eventName) {
67 case KernelEvents::CONTROLLER_ARGUMENTS:
68 $this->stopwatch->start('controller', 'section');
69 break;
70 case KernelEvents::RESPONSE:
71 $token = $event->getResponse()->headers->get('X-Debug-Token');
72 if (null === $token) {
73 break;
74 }
75 $this->stopwatch->stopSection($token);
76 break;
77 case KernelEvents::TERMINATE:
78 // In the special case described in the `preDispatch` method above, the `$token` section
79 // does not exist, then closing it throws an exception which must be caught.
80 $token = $event->getResponse()->headers->get('X-Debug-Token');
81 if (null === $token) {
82 break;
83 }
84 try {
85 $this->stopwatch->stopSection($token);
86 } catch (\LogicException $e) {
87 }
88 break;
89 }
90 }
91 }
92