![]() ![]() The news story block, on the other hand, would have specific tags that line up with the node ID’s that currently appear in the list node:16 node:17 node:18. The homepage might have cache tags specific to the page itself node:5, but this will not invalidate the entire homepage when a news story node:18 is added since the cache tag does not exist in the list of tags for the homepage. How would the homepage cache (more specifically the news block cache) be cleared if we added a news story to the top of this list?Ĭache tags are used to inform the system when the news block would need to be invalidated. This site has a list of three nodes that are displayed in a block on the homepage. As an example, let’s consider a site with a news story content type and view page. There are three main components to the cache layer in Drupal 8:Ĭache tags are for dependencies on data that are managed by Drupal, and are the easiest way to control cache. This means that we can control exactly when a block on a page has its cache cleared instead of clearing the entire page cache. It has become highly customizable and dynamic, and now has the ability to cache individual blocks or items on a page. However, today we are going to dive into one of the other major updates of Drupal 8 that provides a huge boost to performance and perceived performance: the cache layer.Ĭaching in Drupal 8 has received a much needed overhaul. ![]() Some of the prominent features are the inclusion of the widely used views module into core, configuration management, and an easy to use translation service. HTTP/1.Drupal 8 has evolved in many ways over its predecessor. * HTTP/1.0 proxies do not support the Vary header, so prevent any caching by * Disable caching in ancient browsers and for HTTP/1.0 proxies and clients. $expire = ($date > time()) ? $date : Cache::PERMANENT Īnd this expire date is set to "" by FinishResponseSubscriber: /** *) The reason for this behavior is, that Internal Page Cache uses Cache::PERMANENT, if the expire date is in the past: $date = $response->getExpires()->getTimestamp() This is a bit misleading, because the Internal Page Cache does not respect this parameter *), but only puts this value in the response header for reverse proxies and browser caches.įor a high traffic site I would recommend to disable the Internal Page Cache (but keep the dynamic cache!) and use varnish, which will respect the max-age header and provides fine tuning for further handling of the headers. The parameter is "Page cache maximum age". įor the whole page you can set a global max-age in admin/config/development/performance. (edit addition) The block needs to have its cache controlled for anonymous users.įor cache settings of the dynamic cache see the answer from. Every six hours means that it's changed before people wake up across four time zones. The traffic for the site is relatively low volume, so if rendering a thing four times a day even it only needs to be done once a day isn't a problem. ![]() Obviously, this is not related to settings.php in any way either, since again I don't want to have this apply to the entire site, and the various modules will have different timeout requirements. I don't want this to apply to the entire site, just this block. Obviously, this is not related to the Maximum Cache age within the admin area of Configuration > Performance > Caching > Page cache maximum age. (Without checking, obviously.) So how do I add cache tags with specified timeouts? I can't find examples. There's no way for Drupal to know what's changing over there. In other Drupal answers, I've seen "D8 has cache tags and contexts that will automatically invalidate the block if something changes." Ok, my code is checking a second database. Return array('#markup' => $this->t($pageContent), ) does all the work to make $pageContent via non-drupal database queries Now how do I tell this to invalidate every six hours? /** The block is called "RacerProfile" and it dumps all its content into variable "$pageContent". I have the code for a block successfully doing its work and returning it. ![]()
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