private void updateStats() {
    StatResource resource = info.getPerfStats();
    if (resource == null) {
      // See bug 31397
      Assert.assertTrue(isClosed());
      return;
    }

    Stat[] stats = resource.getStats();
    if (stats == null || stats.length < 1) {
      return;
    }

    for (final Stat stat : stats) {
      updateStatistic(stat);
    }
  }
Value that uniquely identifies an instance of a cache for a given member.
geode-core/src/main/java/org/apache/geode/admin/internal/SystemMemberCacheImpl.java