code: public void unsubscribe(ArrayList<Long> tokens){
          if(ws != null) {
              if (ws.isOpen()) {
                  ws.sendText(createTickerJsonObject(tokens, mUnSubscribe).toString());
                  subscribedTokens.removeAll(tokens);
                  for(int i = 0; i < tokens.size(); i++){
                      modeMap.remove(tokens.get(i));
                  }
              }
          }
      }
docs: Unsubscribes ticks for list of tokens.
  @param tokens is the list of tokens that needs to be unsubscribed.