// Should return 0 when auto-connect fails due to missing project ID
        long lastModified = conn.getLastModified();
        assertEquals(0, lastModified);
    }

    /**
     * Test that getDate() delegates to getLastModified().
     */
    public void test_getDate_delegatesToGetLastModified() throws Exception {
        URL url = new URL("gcs://mybucket/object.txt");
        Handler handler = new Handler();

   */
  fun getDate(name: String): Date? = get(name)?.toHttpDateOrNull()

  /**
   * Returns the last value corresponding to the specified field parsed as an HTTP date, or null if
   * either the field is absent or cannot be parsed as a date.
   */
  @IgnoreJRERequirement // Only programs that already have Instant will use this.
  fun getInstant(name: String): Instant? = getDate(name)?.toInstant()

    }

    @Deprecated
    @Override
    public MavenMetadata setFile(File file) {
        return new LocalSnapshotMetadata(metadata, file.toPath(), timestamp);
    }

    @Override
    public MavenMetadata setPath(Path path) {
        return new LocalSnapshotMetadata(metadata, path, timestamp);
    }

    public Object getKey() {
        return getGroupId() + ':' + getArtifactId() + ':' + getVersion();
    }

    @Deprecated
    @Override
    public MavenMetadata setFile(File file) {
        return new RemoteSnapshotMetadata(metadata, file.toPath(), timestamp, buildNumber);
    }

    @Override
    public MavenMetadata setPath(Path path) {
        return new RemoteSnapshotMetadata(metadata, path, timestamp, buildNumber);
    }

    public String getExpandedVersion(Artifact artifact) {

    @Deprecated
    @Override
    public MavenMetadata setFile(File file) {
        return new VersionsMetadata(artifact, file.toPath(), timestamp);
    }

    @Override
    public MavenMetadata setPath(Path path) {
        return new VersionsMetadata(artifact, path, timestamp);
    }

    @Override
    public String getGroupId() {
        return artifact.getGroupId();
    }

    @Override

        boolean halted;
        // The ReactorBuildStatus is only available if the SmartBuilder is used
        ReactorBuildStatus status =
                (ReactorBuildStatus) session.getRepositorySession().getData().get(ReactorBuildStatus.class);
        if (status != null) {
            halted = status.isHalted();
        } else {
            // assume sensible default
            Throwable t = projectExecutionEvent.getCause();

     */
    public void setSerializer(final Function<Object, byte[]> serializer) {
        this.serializer = serializer;
    }

    /**
     * Get the data.
     * @return data
     */
    public byte[] getData() {
        if (data == null) {
            if (serializer == null || rawData == null) {
                throw new CrawlerSystemException("serializer or rawData is null");
            }

            handshake();
        } catch (final IOException ex) {}
        return connection.getExpiration();
    }

    @Override
    public long getDate() {
        try {
            handshake();
        } catch (final IOException ex) {}
        return connection.getDate();
    }

    @Override
    public long getLastModified() {
        try {
            handshake();
        } catch (final IOException ex) {}

            mojos.remove(Thread.currentThread());
        }

        private OwnerReentrantLock getProjectLock(MavenSession session) {
            SessionData data = session.getSession().getData();
            Map<MavenProject, OwnerReentrantLock> locks = data.computeIfAbsent(PROJECT_LOCKS, ConcurrentHashMap::new);
            return locks.computeIfAbsent(session.getCurrentProject(), p -> new OwnerReentrantLock());

 * abused as a cache (i.e. for storing values that can be re-calculated) to avoid memory exhaustion.
 * <p>
 * <strong>Note:</strong> Actual implementations must be thread-safe.
 *
 * @see Session#getData()
 * @since 4.0.0
 */
@Experimental
@ThreadSafe
@Provider
public interface SessionData {

    /**
     * Associates the specified session data with the given key.
     *