![]() 'cookies:devicetype' (to vary by the 'devicetype' cookie). This is beneficial if you have an expensive function that takes a long time to complete. Whilst all of these mechanisms are really useful you can also inject data directly into the cache system. This should help managing Contexts over time without accidentally breaking. The cache system in Drupal has a number of different components with time, contexts and tags being used to determine the cache. Since the cache tags are applied from the Context, re-enabling or disabling a Context will bubble up to the layout/block components. Additionally, it will check that the Context is enabled before executing it. Calculated cache context ID: 'cookies:name', e.g. This release consolidates some of the form field code and removes ''disabled'' Contexts from the option list. Cache context ID: 'cookies' (to vary by all cookies). Defines the CookiesCacheContext service, for 'per cookie' caching. Cache tags Cache tags data dependencies Cache contexts Cache contexts provide a declarative way to create context-dependent variations of something that needs to be cached. Same name and namespace in other branches. The following sections go into more detail on each feature. UMN Drupal sites have three kinds of caching, Drupal Cache, Varnish cache, and Content Delivery Network (CDN) cache. The Cache API is much improved in Drupal 8. When Drupal detects an update to a web page, it often will update the 'cached' version of that page to give to the next viewer. Drupal 8 also has some clever ideas, with using placeholders in caches, so it can cache rendered html of a page with placeholder for username and simply swap username based on logged in user. MYMODULE/EventSubscriber/MyEventSubscriber. Drupal 10.1 Cache.php class Cache Same name and namespace in other branches Helper methods for cache. Caching is a technique that stores copies of webpages and provides those to viewers. The clever thing behind Drupal's caching, is that it merges items, to parts the are general could use a common cache. If your preprocess doesn't affect the result of the page, and needs to execute even when the page is served from the page cache, you should move your logic to a Kernel Event subscriber, which replaces hook_boot() and hook_exit() from Drupal 7.ĭrupalizeMe has an article on Event Subscribers, but the basic components are creating a class that implements EventSubscriberInterface, and then registering it as a service.
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