code: public void submitSafe(Object tag, Object subTag, Runnable runnable) {
          submitSafe(tag, subTag, false, runnable);
      }
docs: Same as submit(String tag, String subTag, Runnable runnable) but task will NOT be added to queue IF there is same task in queue
  
  @param tag      queue tag
  @param subTag   task tag
  @param runnable task