Adds data to the cache if it doesn’t already exist.

Removes the contents of the cache key in the group.

Clears the object cache of all data.

Retrieves the cache contents, if it exists.

Replaces the contents in the cache, if contents already exist.

Sets the data contents into the cache.

Echoes the stats of the caching.

Resets query flags to false.

Sets the 404 property and saves whether query is feed.

Core class used to extend the user roles API.