@Override
  public void refresh() {
    if (!info.isClosed()) {
      CacheInfo cur = vm.getCacheInfo();
      if (cur == null || (info.getId() != cur.getId())) {
        // it is a different instance of the cache. So set our version
        // to closed
        info.setClosed();
      } else {
        info = cur;
        updateStats();
      }
    }
  }
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