java - Web 开发 / 非技术区

class SearchSorter
{
  /** 日志记录对象 */
  private static final DebugLog log = LogUtil.getDebugLog(SearchSorter.class);
   
  private static final long ONE_MINUTE = 1000 * 60;
   
  private static SearchSorter instance = new SearchSorter();
   
  /** 书ID->排行值 关系表 */
  private HashMap<Long, Long> map = new HashMap<Long, Long>();
   
  /** 排行榜类型 */
  private int rankType = -1;
   
  /** 排行榜时间类型 */
  private int ranDateType = -1;
   
  /** 最后的map刷新时间 */
  private long lastRefreshTime = 0;
   
  /** 是否需要刷新标识 */
  private volatile boolean needRefresh = true;
   
  /** map初始化锁 */
  private ReentrantLock initLock = new ReentrantLock();
   
  /**
  * 返回本来的单实例
  */
  public static SearchSorter getInstance(int rankType, int ranDateType)
  {
  if (instance.rankType != rankType || instance.ranDateType != ranDateType)
  {
  instance.needRefresh = true;
  instance.rankType = rankType;
  instance.ran