interface AccountSwitcherInterface

interface AccountSwitcherInterface {
    
    /**
     * Safely switches to another account.
     *
     * Each invocation of AccountSwitcherInterface::switchTo() must be
     * matched by a corresponding invocation of
     * AccountSwitcherInterface::switchBack() in the same function.
     *
     * @param \Drupal\Core\Session\AccountInterface $account
     *   The account to switch to.
     *
     * @return $this
     *   $this.
     */
    public function switchTo(AccountInterface $account);
    
    /**
     * Reverts to a previous account after switching.
     *
     * @return $this
     *   $this.
     *
     * @throws \RuntimeException
     *   When there are no more account switches to revert.
     */
    public function switchBack();

}