interface UpdateManagerInterface

interface UpdateManagerInterface {
    
    /**
     * Project is missing security update(s).
     */
    const NOT_SECURE = 1;
    
    /**
     * Current release has been unpublished and is no longer available.
     */
    const REVOKED = 2;
    
    /**
     * Current release is no longer supported by the project maintainer.
     */
    const NOT_SUPPORTED = 3;
    
    /**
     * Project has a new release available, but it is not a security release.
     */
    const NOT_CURRENT = 4;
    
    /**
     * Project is up to date.
     */
    const CURRENT = 5;
    
    /**
     * Fetches an array of installed projects.
     *
     * This is only responsible for generating an array of projects (taking into
     * account projects that include more than one module or theme). Other
     * information like the specific version and install type (official release,
     * dev snapshot, etc) is handled later in update_process_project_info() since
     * that logic is only required when preparing the status report, not for
     * fetching the available release data.
     *
     * This array is fairly expensive to construct, since it involves a lot of
     * disk I/O, so we store the results. However, since this is not the data
     * about available updates fetched from the network, it is acceptable to
     * invalidate it somewhat quickly. If we keep this data for very long, site
     * administrators are more likely to see incorrect results if they upgrade to
     * a newer version of a module or theme but do not visit certain pages that
     * automatically clear this data.
     *
     * @return array
     *   An associative array of currently installed projects keyed by the
     *   machine-readable project short name. Each project contains:
     *   - name: The machine-readable project short name.
     *   - info: An array with values from the main .info.yml file for this
     *     project.
     *     - name: The human-readable name of the project.
     *     - package: The package that the project is grouped under.
     *     - version: The version of the project.
     *     - project: The Drupal.org project name.
     *     - datestamp: The date stamp of the project's main .info.yml file.
     *     - _info_file_ctime: The maximum file change time for all of the
     *       .info.yml
     *       files included in this project.
     *   - datestamp: The date stamp when the project was released, if known.
     *   - includes: An associative array containing all projects included with
     *     this project, keyed by the machine-readable short name with the
     *     human-readable name as value.
     *   - project_type: The type of project. Allowed values are 'module' and
     *     'theme'.
     *   - project_status: This indicates if the project is installed and will
     *     always be TRUE, as the function only returns installed projects.
     *
     * @see update_process_project_info()
     * @see update_calculate_project_data()
     * @see \Drupal\update\UpdateManager::projectStorage()
     */
    public function getProjects();
    
    /**
     * Processes a step in batch for fetching available update data.
     *
     * Before calling this method, call
     * UpdateManagerInterface::refreshUpdateData() to clear existing update data
     * and initiate re-fetching.
     *
     * @param array $context
     *   Reference to an array used for Batch API storage.
     *
     * @see \Drupal\update\UpdateManagerInterface::refreshUpdateData()
     */
    public function fetchDataBatch(&$context);
    
    /**
     * Clears out all the available update data and initiates re-fetching.
     */
    public function refreshUpdateData();
    
    /**
     * Retrieves update storage data or empties it.
     *
     * Two very expensive arrays computed by this module are the list of all
     * installed modules and themes (and .info.yml data, project associations,
     * etc), and the current status of the site relative to the currently
     * available releases. These two arrays are stored and used whenever possible.
     * The data is cleared whenever the administrator visits the status report,
     * available updates report, or the module or theme administration pages,
     * since we should always recompute the most current values on any of those
     * pages.
     *
     * Note: while both of these arrays are expensive to compute (in terms of disk
     * I/O and some fairly heavy CPU processing), neither of these is the actual
     * data about available updates that we have to fetch over the network from
     * updates.drupal.org. That information is stored in the
     * 'update_available_releases' collection -- it needs to persist longer than 1
     * hour and never get invalidated just by visiting a page on the site.
     *
     * @param string $key
     *   The key of data to return. Valid options are 'update_project_data' and
     *   'update_project_projects'.
     *
     * @return array
     *   The stored value of the $projects array generated by
     *   update_calculate_project_data() or
     *   \Drupal\update\UpdateManager::getProjects(), or an empty array when the
     *   storage is cleared.
     *   array when the storage is cleared.
     */
    public function projectStorage($key);

}