AppData¶
Often an app wants to store data. However not all data that is stored belongs with the users files. Often you just want a very simple storage to have some temp files. In order to facilitate this there is the AppData folder that provides each app with a private simple filesystem.
Usage is almost trivial when your app is using the AppFramework.
<?php
namespace OCA\MyApp\Controller\MyController;
use OCP\AppFramework\Controller;
use OCP\Files\IAppData;
use OCP\IRequest;
class MyController extends Controller {
/** @var IAppData */
private $appData;
public function __construct($appName,
IRequest $request,
IAppData $appData) {
parent::__construct($appName, $request);
$this->appData = $appData;
}
}
This gives your controller access to the IAppData simple filesystem of your app.
The Simple Filesystem¶
The IAppData uses the simple filesystem. This is a very simplified filesystem that will allow for easy mapping to for example memcaches. The filesystem has three elements: root, folder, file.
The root can only contain folders. And each folder can only contain files. This is limited to keep things simple and to allow easy mapping to other backends. For example a sysadmin might chose to map the avatars to fast storage since they are used often.
