blockedIps.put(ip, Boolean.TRUE);
        logger.info("IP manually blocked: ip={}", ip);
    }

    /**
     * Unblock an IP address.
     * @param ip the IP address to unblock
     */
    public void unblockIp(final String ip) {
        blockedIps.invalidate(ip);
        logger.info("IP unblocked: ip={}", ip);
    }

    /**
     * Get the number of currently blocked IPs.

    }

    @Test
    public void test_blockIp() {
        rateLimitHelper.blockIp("192.168.1.100", 1000L);
        assertEquals(1, rateLimitHelper.getBlockedIpCount());

        rateLimitHelper.unblockIp("192.168.1.100");
        assertEquals(0, rateLimitHelper.getBlockedIpCount());
    }

    @Test
    public void test_cleanup() {
        rateLimitHelper.blockIp("192.168.1.100", 1L);