return responseQueue.peek() ?: failFastResponse ?: super.peek()
  }

  open fun enqueueResponse(response: MockResponse) {
    responseQueue.add(response)
  }

  open fun clear() {
    responseQueue.clear()
  }

  override fun shutdown() {
    responseQueue.add(DEAD_LETTER)
  }

  open fun setFailFast(failFast: Boolean) {
    val failFastResponse =
      if (failFast) {

	// Rotate active journal to perform pending deletes.
	return os.Rename(jPath, jroPath)
}

// Open opens a new active journal. Note: calling Open on an opened journal is a
// no-op.
func (jd *tierDiskJournal) Open() error {
	jd.Lock()
	defer jd.Unlock()
	if jd.file != nil { // already open
		return nil
	}

	var err error

    assertTrue(rangeSet.intersects(Range.open(5, 8)));
    assertFalse(rangeSet.intersects(Range.closed(3, 4)));
    assertTrue(rangeSet.intersects(Range.greaterThan(5)));
    assertFalse(rangeSet.intersects(Range.greaterThan(8)));

    assertTrue(rangeSet.encloses(Range.closed(1, 2)));
    assertTrue(rangeSet.encloses(Range.open(5, 8)));
    assertFalse(rangeSet.encloses(Range.closed(1, 8)));

  private static final ByteSource BROKEN_OPEN_SOURCE =
      new TestByteSource(new byte[10], OPEN_THROWS);
  private static final ByteSource BROKEN_READ_SOURCE =
      new TestByteSource(new byte[10], READ_THROWS);
  private static final ByteSink BROKEN_CLOSE_SINK = new TestByteSink(CLOSE_THROWS);
  private static final ByteSink BROKEN_OPEN_SINK = new TestByteSink(OPEN_THROWS);

		if dbDSN == "" {
			dbDSN = sqlserverDSN
		}
		db, err = gorm.Open(sqlserver.Open(dbDSN), cfg)
	case "tidb":
		log.Println("testing tidb...")
		if dbDSN == "" {
			dbDSN = tidbDSN
		}
		db, err = gorm.Open(mysql.Open(dbDSN), cfg)
	default:
		log.Println("testing sqlite3...")
		db, err = gorm.Open(sqlite.Open(filepath.Join(os.TempDir(), "gorm.db")), cfg)
		if err == nil {

    } else {
      eventSequence.forEach loop@{
        when (e.closes(it)) {
          null -> return // no open event
          true -> return // found open event
          false -> return@loop // this is not the open event so continue
        }
      }
      Assertions.fail<Any>("event $e without matching start event")
    }
  }

  override fun connectStart(

      this.trailersFn = response.trailersFn
    }

    open fun request(request: Request) = commonRequest(request)

    open fun protocol(protocol: Protocol) = commonProtocol(protocol)

    open fun code(code: Int) = commonCode(code)

    open fun message(message: String) = commonMessage(message)

    open fun handshake(handshake: Handshake?) =
      apply {
        this.handshake = handshake

      for (int j = i; j <= MAX_BOUND; j++) {
        for (BoundType lowerType : BoundType.values()) {
          for (BoundType upperType : BoundType.values()) {
            if (i == j & lowerType == OPEN & upperType == OPEN) {
              continue;
            }
            builder.add(Range.range(i, lowerType, j, upperType));
          }
        }
      }
    }
    RANGES = builder.build();
  }

	f, err := Open(path, flag, perm)
	if err != nil {
		return nil, err
	}

	if err = lockFile(syscall.Handle(f.Fd()), lockType); err != nil {
		f.Close()
		return nil, err
	}

	st, err := os.Stat(path)
	if err != nil {
		f.Close()
		return nil, err
	}

	if st.IsDir() {
		f.Close()
		return nil, &os.PathError{
			Op:   "open",
			Path: path,
			Err:  syscall.EISDIR,

  /**
   * Invoked when an event source has been accepted by the remote peer and may begin transmitting
   * events.
   */
  open fun onOpen(
    eventSource: EventSource,
    response: Response,
  ) {
  }

  /**
   * TODO description.
   */
  open fun onEvent(
    eventSource: EventSource,
    id: String?,
    type: String?,
    data: String,
  ) {
  }

  /**