This method will either return "false" if the cache is not found, or a stdClass object that contains the cache data saved in the "data" parameter. $output = \Drupal::cache()->get($cacheId) This method accepts the cache ID you want to get. For example, you can pass in the tag "node:1" so that if the entity node 1 is changed then this cache item is invalidated so that new caches can be created.Ĭonversely, the get() method is used to get some data from the cache system. These are used by Drupal to invalidate this cache item when other things on the site change. $cacheTags - You can optionally pass in an array of cache tags.This is an optional argument and Cache::PERMANENT is assumed if this is left out. Expired cache items are periodically cleared by Drupal's garbage collection systems. The timestamp tells Drupal the time that the cache should be considered expired. You can either add what I have added here (the Cache::PERMANENT constant, which will store the cache forever) or you can add a timestamp. Cache::PERMANENT - The third parameter is the length of time to keep the cache for.The data is automatically serialised so as long as the data is serialiseable then the data it fine to save. This can be a simple vale or a more complex array. $data - The second parameter is just the data you want to cache.This will be used later to read the cache data back out. $cacheId - This is s string that is used to identify the cache data in your cache system.Let's go through the parameters a little. \Drupal::cache()->set($cacheId, $data, Cache::PERMANENT, $cacheTags) This takes a few parameters and is called like this. The first method to talk about is the set() method, which is used to write some cache to the cache system. Once you have a cache object, there are a couple of important methods you can use. 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. By default, this will assume that you want to use the 'default' cache bin, which is essentially the cache_default table (assuming you are using the database for your cache storage). The clever thing behind Drupal's caching, is that it merges items, to parts the are general could use a common cache. To get an instance of the cache system you can use the \Drupal::cache() method, which will return an instance of a CacheBackendInterface type object. If the data doesn't change much it might be better to add a cache to the request so that instead of going to the slow API the fast cache systems are used instead. The result of the function can be stored in the Drupal cache system just like other cache data.įor example, let's say you are pulling data from a slow API. 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. The cache system in Drupal has a number of different components with time, contexts and tags being used to determine the cache.
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