}
    }

    /**
     * Exception thrown when circuit breaker is open
     */
    public static class CircuitBreakerOpenException extends Exception {
        private static final long serialVersionUID = 1L;

        public CircuitBreakerOpenException(String message) {
            super(message);
        }
    }

                    return null;
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            });
        } catch (SimpleCircuitBreaker.CircuitBreakerOpenException e) {
            // Log circuit breaker rejection
            auditLogger.logSecurityViolation("Circuit breaker open for SMB connection",