private boolean enqueue(QuerySet querySet) {
   boolean newEntry = false;
   LinkedList<QuerySet> queries = mBssQueues.get(querySet.getBssid());
   if (queries == null) {
     queries = new LinkedList<>();
     mBssQueues.put(querySet.getBssid(), queries);
     newEntry = true;
   }
   queries.addLast(querySet);
   return newEntry;
 }
  public void tickle(boolean wifiOff) {
    synchronized (mCache) {
      if (wifiOff) {
        mBssQueues.clear();
      } else {
        long now = System.currentTimeMillis();

        Iterator<Map.Entry<Long, LinkedList<QuerySet>>> bssIterator =
            mBssQueues.entrySet().iterator();
        while (bssIterator.hasNext()) {
          // Get the list of entries for this BSSID
          Map.Entry<Long, LinkedList<QuerySet>> bssEntries = bssIterator.next();
          Iterator<QuerySet> querySetIterator = bssEntries.getValue().iterator();
          while (querySetIterator.hasNext()) {
            QuerySet querySet = querySetIterator.next();
            QueryEntry queryEntry = querySet.peek();
            long age = queryEntry.age(now);
            if (age > RequeryTimeHigh) {
              // Timed out entry, move on to the next.
              queryEntry = querySet.pop();
              if (queryEntry == null) {
                // Empty query set, update status and remove it.
                querySet.getOsuInfo().setIconStatus(OSUInfo.IconStatus.NotAvailable);
                querySetIterator.remove();
              } else {
                // Start a query on the next entry and bail out of the set iteration
                initiateQuery(querySet.getBssid());
                break;
              }
            } else if (age > RequeryTimeLow) {
              // Re-issue queries for qualified entries and bail out of set iteration
              initiateQuery(querySet.getBssid());
              break;
            }
          }
          if (bssEntries.getValue().isEmpty()) {
            // Kill the whole bucket if the set list is empty
            bssIterator.remove();
          }
        }
      }
    }
  }
  public void startIconQuery(OSUInfo osuInfo, List<IconInfo> icons) {
    Log.d("ZXZ", String.format("Icon query on %012x for %s", osuInfo.getBSSID(), icons));
    if (icons == null || icons.isEmpty()) {
      return;
    }

    QuerySet querySet = new QuerySet(osuInfo, icons);
    for (QueryEntry entry : querySet.getAllEntries()) {
      HSIconFileElement iconElement = mCache.get(entry.getKey());
      if (iconElement != null) {
        osuInfo.setIconFileElement(iconElement, entry.getKey().getFileName());
        mOSUManager.iconResults(Arrays.asList(osuInfo));
        return;
      }
    }
    if (enqueue(querySet)) {
      initiateQuery(querySet.getBssid());
    }
  }