.listIterator(collectStepTrace.getPath().size());
                while (iter.hasPrevious()) {
                    DependencyNode curr = iter.previous();
                    indent += "  ";
                    trackingData.add(indent + curr + " (" + collectStepTrace.getContext() + ")");
                }
            }
        }

        if (trackingFile == null) {
            return;

    SettableFuture<String> orig = SettableFuture.create();
    SettableFuture<String> prev = orig;
    for (int i = 0; i < 100000; i++) {
      SettableFuture<String> curr = SettableFuture.create();
      prev.setFuture(curr);
      prev = curr;
    }
    // prev represents the 'innermost' future
    prev.set("done");
    assertTrue(orig.isDone());
  }

	r.RUnlock()
}

// ActiveWorkers returns worker stats
func (r *ReplicationStats) ActiveWorkers() ActiveWorkerStat {
	r.wlock.RLock()
	defer r.wlock.RUnlock()
	w := r.workers.get()
	return ActiveWorkerStat{
		Curr: w.Curr,
		Max:  w.Max,
		Avg:  w.Avg,
	}
}

func (r *ReplicationStats) collectWorkerMetrics(ctx context.Context) {
	if r == nil {
		return
	}
	for {
		select {
		case <-ctx.Done():

    while (true) {
      Waiter pred = null;
      Waiter curr = waiters;
      if (curr == Waiter.TOMBSTONE) {
        return; // give up if someone is calling complete
      }
      Waiter succ;
      while (curr != null) {
        succ = curr.next;
        if (curr.thread != null) { // we aren't unlinking this node, update pred.
          pred = curr;

    for (int i = 0; i < 2; i++) {
      typesLists.add(possibleParamTypes);
      for (List<Class<?>> curr : Lists.cartesianProduct(typesLists)) {
        allOverloads.add(
            ImmutableList.<Class<?>>builder()
                .add(predicateType)
                .add(String.class) // the format string
                .addAll(curr)
                .build());
      }
    }
    return allOverloads.build().asList();
  }

    for (int i = 0; i < 2; i++) {
      typesLists.add(possibleParamTypes);
      for (List<Class<?>> curr : Lists.cartesianProduct(typesLists)) {
        allOverloads.add(
            ImmutableList.<Class<?>>builder()
                .add(predicateType)
                .add(String.class) // the format string
                .addAll(curr)
                .build());
      }
    }
    return allOverloads.build().asList();
  }

			if qs.QStats.Avg.Count > 0 || qs.QStats.Curr.Count > 0 {
				qt := qs.QStats
				currInQueueBytes.Value = qt.Curr.Bytes
				currInQueueCount.Value = qt.Curr.Count
				avgQueueBytes.Value = qt.Avg.Bytes
				avgQueueCount.Value = qt.Avg.Count
				maxQueueBytes.Value = qt.Max.Bytes
				maxQueueCount.Value = qt.Max.Count
			}
			activeWorkersCount.Value = float64(qs.ActiveWorkers.Curr)

		sm.ActiveWorkers.Curr += peer.ActiveWorkers.Curr
		if peer.ActiveWorkers.Max > sm.ActiveWorkers.Max {
			sm.ActiveWorkers.Max += peer.ActiveWorkers.Max
		}
		sm.Queued.Avg.Bytes += peer.Queued.Avg.Bytes
		sm.Queued.Avg.Count += peer.Queued.Avg.Count
		sm.Queued.Curr.Bytes += peer.Queued.Curr.Bytes
		sm.Queued.Curr.Count += peer.Queued.Curr.Count
		if peer.Queued.Max.Count > sm.Queued.Max.Count {

			}
			return spd
		}(),
	}}

	for i, v := range vectors {
		var hdr Header
		hdr.PAXRecords = v.inputHdrs
		r := strings.NewReader(v.inputData + "#") // Add canary byte
		tr := Reader{curr: &regFileReader{r, int64(r.Len())}}
		got, err := tr.readGNUSparsePAXHeaders(&hdr)
		if !equalSparseEntries(got, v.wantMap) {
			t.Errorf("test %d, readGNUSparsePAXHeaders(): got %v, want %v", i, got, v.wantMap)
		}