interface NodeGrantDatabaseStorageInterface

interface NodeGrantDatabaseStorageInterface {
    
    /**
     * Checks all grants for a given account.
     *
     * @param \Drupal\Core\Session\AccountInterface $account
     *   A user object representing the user for whom the operation is to be
     *   performed.
     *
     * @return int
     *   Status of the access check.
     */
    public function checkAll(AccountInterface $account);
    
    /**
     * Alters a query when node access is required.
     *
     * @param mixed $query
     *   Query that is being altered.
     * @param array $tables
     *   A list of tables that need to be part of the alter.
     * @param string $op
     *   The operation to be performed on the node. Possible values are:
     *   - "view"
     *   - "update"
     *   - "delete"
     *   - "create"
     * @param \Drupal\Core\Session\AccountInterface $account
     *   A user object representing the user for whom the operation is to be
     *   performed.
     * @param string $base_table
     *   The base table of the query.
     *
     * @return int
     *   Status of the access check.
     */
    public function alterQuery($query, array $tables, $op, AccountInterface $account, $base_table);
    
    /**
     * Writes a list of grants to the database, deleting previously saved ones.
     *
     * If a realm is provided, it will only delete grants from that realm, but
     * it will always delete a grant from the 'all' realm. Modules that use
     * node access can use this method when doing mass updates due to widespread
     * permission changes.
     *
     * Note: Don't call this method directly from a contributed module. Call
     * \Drupal\node\NodeAccessControlHandlerInterface::acquireGrants() instead.
     *
     * @param \Drupal\node\NodeInterface $node
     *   The node whose grants are being written.
     * @param array $grants
     *   A list of grants to write. Each grant is an array that must contain the
     *   following keys: realm, gid, grant_view, grant_update, grant_delete.
     *   The realm is specified by a particular module; the gid is as well, and
     *   is a module-defined id to define grant privileges. each grant_* field
     *   is a boolean value.
     * @param string $realm
     *   (optional) If provided, read/write grants for that realm only. Defaults to
     *   NULL.
     * @param bool $delete
     *   (optional) If false, does not delete records. This is only for optimization
     *   purposes, and assumes the caller has already performed a mass delete of
     *   some form. Defaults to TRUE.
     */
    public function write(NodeInterface $node, array $grants, $realm = NULL, $delete = TRUE);
    
    /**
     * Deletes all node access entries.
     */
    public function delete();
    
    /**
     * Creates the default node access grant entry.
     */
    public function writeDefault();
    
    /**
     * Determines access to nodes based on node grants.
     *
     * @param \Drupal\node\NodeInterface $node
     *   The entity for which to check 'create' access.
     * @param string $operation
     *   The entity operation. Usually one of 'view', 'edit', 'create' or
     *   'delete'.
     * @param \Drupal\Core\Session\AccountInterface $account
     *   The user for which to check access.
     *
     * @return \Drupal\Core\Access\AccessResultInterface
     *   The access result, either allowed or neutral. If there are no node
     *   grants, the default grant defined by writeDefault() is applied.
     *
     * @see hook_node_grants()
     * @see hook_node_access_records()
     * @see \Drupal\node\NodeGrantDatabaseStorageInterface::writeDefault()
     */
    public function access(NodeInterface $node, $operation, AccountInterface $account);
    
    /**
     * Counts available node grants.
     *
     * @return int
     *   Returns the amount of node grants.
     */
    public function count();
    
    /**
     * Remove the access records belonging to certain nodes.
     *
     * @param array $nids
     *   A list of node IDs. The grant records belonging to these nodes will be
     *   deleted.
     */
    public function deleteNodeRecords(array $nids);

}