/** {@inheritDoc} */
  @Override
  public final Map<UUID, GridNodeMetrics> metrics(Collection<UUID> nodeIds)
      throws GridSpiException {
    assert !F.isEmpty(nodeIds);

    long now = U.currentTimeMillis();

    Collection<UUID> expired = new LinkedList<>();

    for (UUID id : nodeIds) {
      GridNodeMetrics nodeMetrics = metricsMap.get(id);

      Long ts = tsMap.get(id);

      if (nodeMetrics == null || ts == null || ts < now - metricsExpireTime) expired.add(id);
    }

    if (!expired.isEmpty()) {
      Map<UUID, GridNodeMetrics> refreshed = metrics0(expired);

      for (UUID id : refreshed.keySet()) tsMap.put(id, now);

      metricsMap.putAll(refreshed);
    }

    return F.view(metricsMap, F.contains(nodeIds));
  }
 /**
  * @param e Transaction entry.
  * @return {@code True} if entry is locally mapped as a primary or back up node.
  */
 protected boolean isNearLocallyMapped(GridCacheEntryEx<K, V> e) {
   return F.contains(ctx.affinity(e.key(), CU.allNodes(ctx)), ctx.localNode());
 }