}
        }

        if (sourceIp != null) {
            IpAttempts ip = ipAttempts.computeIfAbsent(sourceIp, k -> new IpAttempts());
            ip.recordAttempt();
        }
    }

    /**
     * Check global rate limit
     */
    private boolean checkGlobalRateLimit() {
        long now = System.currentTimeMillis();