code: protected BigDecimal calculateScore(final HttpServletRequest request,
                                          final Authentication authentication,
                                          final RegisteredService service,
                                          final Collection<? extends CasEvent> events) {
          return HIGHEST_RISK_SCORE;
      }
docs: Calculate score authentication risk score.
  
  @param request        the request
  @param authentication the authentication
  @param service        the service
  @param events         the events
  @return the authentication risk score