interface ForumManagerInterface

interface ForumManagerInterface {
    
    /**
     * Gets list of forum topics.
     *
     * @param int $tid
     *   Term ID.
     * @param \Drupal\Core\Session\AccountInterface $account
     *   Account to fetch topics for.
     *
     * @return array
     *   Array with keys 'topics' and 'header'.
     */
    public function getTopics($tid, AccountInterface $account);
    
    /**
     * Utility method to fetch the child forums for a given forum.
     *
     * @param int $vid
     *   The forum vocabulary ID.
     * @param int $tid
     *   The forum ID to fetch the children for.
     *
     * @return array
     *   Array of children.
     */
    public function getChildren($vid, $tid);
    
    /**
     * Generates and returns the forum index.
     *
     * The forum index is a pseudo term that provides an overview of all forums.
     *
     * @return \Drupal\taxonomy\TermInterface
     *   A pseudo term representing the overview of all forums.
     */
    public function getIndex();
    
    /**
     * Resets the ForumManager index and history.
     */
    public function resetCache();
    
    /**
     * Checks whether a node can be used in a forum, based on its content type.
     *
     * @param \Drupal\node\NodeInterface $node
     *   A node entity.
     *
     * @return bool
     *   Boolean indicating if the node can be assigned to a forum.
     */
    public function checkNodeType(NodeInterface $node);
    
    /**
     * Calculates the number of new posts in a forum that the user has not yet read.
     *
     * Nodes are new if they are newer than HISTORY_READ_LIMIT.
     *
     * @param int $term
     *   The term ID of the forum.
     * @param int $uid
     *   The user ID.
     *
     * @return int
     *   The number of new posts in the forum that have not been read by the user.
     */
    public function unreadTopics($term, $uid);

}