@Override
  public boolean trySplitAtPosition(Long splitOffset) {
    return trySplitAtPosition(splitOffset.longValue());
  }
@Test
  public void testSplitAtOffsetFailsIfUnstarted() throws Exception {
    OffsetRangeTracker tracker = new OffsetRangeTracker(100, 200);
    assertFalse(tracker.trySplitAtPosition(150));
  }