docs: private void linkSession(long csid, long sessionID) {
  
          LongKeyIntValueHashMap scsMap;
  
          scsMap = (LongKeyIntValueHashMap) sessionUseMap.get(sessionID);
  
          if (scsMap == null) {
              scsMap = new LongKeyIntValueHashMap();
  
              sessionUseMap.put(sessionID, scsMap);
          }
  
          int count = scsMap.get(csid, 0);
  
          scsMap.put(csid, count + 1);
  
          if (count == 0) {
              useMap.put(csid, useMap.get(csid, 0) + 1);
          }
      }