class CountingSource {

  @Deprecated
  public static UnboundedSource<Long, CounterMark> unboundedWithTimestampFn(
      SerializableFunction<Long, Instant> timestampFn) {
    return new UnboundedCountingSource(0, 1, 1L, Duration.ZERO, timestampFn);
  }

  private  CountingSource();

}