code: public void start(CockroachQueue queue) {
          if(!started){
              logger.info("starting...");
              config.print();
              try {
                  this.executerManager.bindListener(BootstrapExecutersListener.class).bindListener(this.config.getExecutersListener()).start(queue);
              } catch (Exception e) {
                  logger.info("start faild");
                  logger.debug(e.getMessage());
                  e.printStackTrace();
              }
              this.started = true;
              logger.info("start success");
          }else{
              logger.warn("the cockroach has already started");
          }
      }
docs: 启动爬虫程序
  只能启动一次，启动之前先判断之前有没有启动过
  @param queue
  @throws IllegalAccessException
  @throws InstantiationException