code: public static void notifyIdleness(Iterator<? extends IoSession> sessions, long currentTime) {
          IoSession s;
          while (sessions.hasNext()) {
              s = sessions.next();
              notifyIdleSession(s, currentTime);
          }
      }
docs: Fires a {@link IoEventType#SESSION_IDLE} event to any applicable
  sessions in the specified collection.
  
  @param currentTime the current time (i.e. {@link System#currentTimeMillis()})