![Events Diagram](../assets/images/******@****.***)

Here’s a [sample event listener](https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PrintEventsNonConcurrent.java) that prints each event with a timestamp.

```java
class PrintingEventListener extends EventListener {
  private long callStartNanos;

  private void printEvent(String name) {
    long nowNanos = System.nanoTime();
    if (name.equals("callStart")) {

- The Date [functions](https://docs.aws.amazon.com/AmazonS3/latest/dev/s3-glacier-select-sql-reference-date.html) `DATE_ADD`, `DATE_DIFF`, `EXTRACT` and `UTCNOW` along with type conversion using `CAST` to the `TIMESTAMP` data type are currently supported.
- AWS S3's [reserved keywords](https://docs.aws.amazon.com/AmazonS3/latest/dev/s3-glacier-select-sql-reference-keyword-list.html) list is not yet respected.

     */
    protected ThreadGroup crawlerThreadGroup;

    /**
     * Constructs a new Crawler instance.
     * Initializes the crawler context with a new session ID based on the current timestamp.
     */
    public Crawler() {
        crawlerContext = new CrawlerContext();
        final SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS", Locale.ENGLISH);

     * @param valueMap The value map.
     */
    protected void printByEcs(final Map<String, String> valueMap) {
        final StringBuilder buf = new StringBuilder(100);
        buf.append("{\"@timestamp\":\"").append(valueMap.remove("time")).append('"');
        buf.append(",\"log.level\":\"INFO\"");
        buf.append(",\"ecs.version\":\"").append(ecsVersion).append('"');

            }

            public synchronized void reset(long timestamp) {
                requestCount = 0;
                failureCount = 0;
                totalResponseTime = 0;
                minResponseTime = Long.MAX_VALUE;
                maxResponseTime = 0;
                lastUpdateTime = timestamp;
            }

            public long getRequestCount() {

            if (params != null) {
                builder.field("hasParams", true);
            } else {
                builder.field("hasParams", false);
            }

            builder.field("timestamp", System.currentTimeMillis());

            // Add array
            builder.startArray("values");
            for (int i = 0; i < 3; i++) {
                builder.value(i);
            }

		l.Totals[idx] = AccElem{}
		l.LastMin++
	}
}

// BucketStatsMap captures bucket statistics for all buckets
type BucketStatsMap struct {
	Stats     map[string]BucketStats
	Timestamp time.Time
}

// BucketStats bucket statistics
type BucketStats struct {
	Uptime           int64                  `json:"uptime"`

        Type2Message type2 = new Type2Message(createMockContext(), flags, challenge, "TARGET");

        // Create target information with timestamp for NTLMv2
        List<AvPair> pairs = new LinkedList<>();
        pairs.add(new AvTargetName("TARGET"));
        pairs.add(new AvTimestamp(System.currentTimeMillis()));
        pairs.add(new AvFlags(0));
        pairs.add(new AvSingleHost(new byte[48])); // Dummy single host data

    /** The key of the configuration. e.g. labels.facet_timestamp_title:labels.facet_timestamp_1day=timestamp:[now/d-1d TO *]	labels.facet_timestamp_1week=timestamp:[now/d-7d TO *]	labels.facet_timestamp_1month=timestamp:[now/d-1M TO *]	labels.facet_timestamp_1year=timestamp:[now/d-1y TO *]<br>

    /** Session ID for secure key management */
    private String sessionId = null;
    /** Time-to-live for cached authentication in milliseconds */
    private long authenticationTTL = 3600000L; // 1 hour default
    /** Timestamp when the authentication was created */
    private long authenticationTimestamp = System.currentTimeMillis();
    /** Flag to track if this authenticator has been closed */
    private volatile boolean closed = false;