* to an OpenSearch index for downstream processing.
 */
public class LogNotificationTarget implements TimeoutTarget {

    /**
     * Default constructor.
     */
    public LogNotificationTarget() {
        // Default constructor
    }

    private static final Logger logger = LogManager.getLogger(LogNotificationTarget.class);
    private static final String NOTIFICATION_QUEUE_INDEX = "fess_log.notification_queue";

        ComponentUtil.getFessConfig().setLogNotificationEnabled(true);
        logNotificationTarget = new LogNotificationTarget();
    }

    @Test
    public void test_constructor() {
        LogNotificationTarget target = new LogNotificationTarget();
        assertNotNull(target);
    }

    @Test
    public void test_expired_emptyBuffer() {

    private TimeoutTask timeoutTask;
    private LogNotificationTarget logNotificationTarget;
    private final ConcurrentLinkedQueue<LogNotificationEvent> queue = new ConcurrentLinkedQueue<>();
    private final AtomicInteger size = new AtomicInteger(0);

    /**
     * Initializes the log notification timer.
     */
    @PostConstruct
    public void init() {
        logNotificationTarget = new LogNotificationTarget();

                            true);

            if (ComponentUtil.getFessConfig().isLogNotificationEnabled()) {
                logNotificationTarget = new LogNotificationTarget();
                logNotificationTask = TimeoutManager.getInstance()
                        .addTimeoutTarget(logNotificationTarget, ComponentUtil.getFessConfig().getLogNotificationFlushIntervalAsInteger(),
                                true);
            }

                            true);

            if (ComponentUtil.getFessConfig().isLogNotificationEnabled()) {
                logNotificationTarget = new LogNotificationTarget();
                logNotificationTask = TimeoutManager.getInstance()
                        .addTimeoutTarget(logNotificationTarget, ComponentUtil.getFessConfig().getLogNotificationFlushIntervalAsInteger(),
                                true);
            }

                            true);

            if (ComponentUtil.getFessConfig().isLogNotificationEnabled()) {
                logNotificationTarget = new LogNotificationTarget();
                logNotificationTask = TimeoutManager.getInstance()
                        .addTimeoutTarget(logNotificationTarget, ComponentUtil.getFessConfig().getLogNotificationFlushIntervalAsInteger(),
                                true);
            }

    }

    @Test
    public void test_append_excludedLogger_logNotificationTarget() {
        final LogEvent event = createLogEvent(Level.ERROR, "org.codelibs.fess.timer.LogNotificationTarget", "should be excluded");
        appender.append(event);
        final List<LogNotificationEvent> events = ComponentUtil.getLogNotificationHelper().drainAll();
        assertEquals(0, events.size());
    }

            "org.codelibs.fess.helper.NotificationHelper", //
            "org.codelibs.fess.util.LogNotificationAppender", //
            "org.codelibs.fess.job.LogNotificationJob", //
            "org.codelibs.fess.timer.LogNotificationTarget", //
            "org.codelibs.fess.helper.LogNotificationHelper", //
            "org.codelibs.curl" //
    );

    private final Level minLevel;

    /**
     * Constructs a new LogNotificationAppender.