/**
* Process the _tags request attribute, which is set when using the Tag
* annotation.
*
* - For a safe (GET or HEAD) request, the tags are set on the response.
* - For a non-safe request, the tags will be invalidated.
*
* @param FilterResponseEvent $event
*/
public function onKernelResponse(FilterResponseEvent $event)
{
$request = $event->getRequest();
$response = $event->getResponse();
$tags = array();
// Only set cache tags or invalidate them if response is successful
if ($response->isSuccessful()) {
$tags = $this->getAnnotationTags($request);
}
$configuredTags = $this->matchRule($request, $response);
if ($configuredTags) {
$tags = array_merge($tags, $configuredTags['tags']);
foreach ($configuredTags['expressions'] as $expression) {
$tags[] = $this->evaluateTag($expression, $request);
}
}
if ($request->isMethodSafe()) {
$this->tagHandler->addTags($tags);
if (HttpKernelInterface::MASTER_REQUEST === $event->getRequestType()) {
// For safe requests (GET and HEAD), set cache tags on response
$this->tagHandler->tagResponse($response);
}
} elseif (count($tags)) {
// For non-safe methods, invalidate the tags
$this->tagHandler->invalidateTags($tags);
}
}
/**
* @param array $tags
*/
public function invalidateTags($tags)
{
if (!$this->cacheEnabled) {
return;
}
$this->tagHandler->invalidateTags($tags);
}