java - Web ¿ª·¢ / ·Ç¼¼ÊõÇø

class SearchSorter
{
  /** ÈÕÖ¾¼Ç¼¶ÔÏó */
  private static final DebugLog log = LogUtil.getDebugLog(SearchSorter.class);
   
  private static final long ONE_MINUTE = 1000 * 60;
   
  private static SearchSorter instance = new SearchSorter();
   
  /** ÊéID->ÅÅÐÐÖµ ¹Øϵ±í */
  private HashMap<Long, Long> map = new HashMap<Long, Long>();
   
  /** ÅÅÐаñÀàÐÍ */
  private int rankType = -1;
   
  /** ÅÅÐаñʱ¼äÀàÐÍ */
  private int ranDateType = -1;
   
  /** ×îºóµÄmapË¢ÐÂʱ¼ä */
  private long lastRefreshTime = 0;
   
  /** ÊÇ·ñÐèҪˢбêʶ */
  private volatile boolean needRefresh = true;
   
  /** map³õʼ»¯Ëø */
  private ReentrantLock initLock = new ReentrantLock();
   
  /**
  * ·µ»Ø±¾À´µÄµ¥ÊµÀý
  */
  public static SearchSorter getInstance(int rankType, int ranDateType)
  {
  if (instance.rankType != rankType || instance.ranDateType != ranDateType)
  {
  instance.needRefresh = true;
  instance.rankType = rankType;
  instance.ran