}

    public void test_isChangedClusterState() {
        systemHelper.isChangedClusterState(0);
        assertFalse(systemHelper.isChangedClusterState(0));
        assertTrue(systemHelper.isChangedClusterState(1));
        assertTrue(systemHelper.isChangedClusterState(2));
        assertFalse(systemHelper.isChangedClusterState(2));
    }

    public void test_getRedirectResponseToLogin() {

        final StringBuilder resultBuf = new StringBuilder();

        final PingResponse ping = searchEngineClient.ping();
        final int status = ping.getStatus();
        if (systemHelper.isChangedClusterState(status)) {
            if (fessConfig.hasNotification()) {
                final String toStrs = fessConfig.getNotificationTo();
                final String[] toAddresses;

    }

    public void addUpdateConfigListener(final String name, final Supplier<String> listener) {
        updateConfigListenerMap.put(name, listener);
    }

    public boolean isChangedClusterState(final int status) {
        return previousClusterState.getAndSet(status) != status;
    }

    public ActionValidator<FessMessages> createValidator(final RequestManager requestManager,