code: public void setThreadKeepAliveTime(int threadKeepAliveTime) {
          this.threadKeepAliveTime = Math.max(MIN_RECEIVE_THREAD_KEEP_ALIVE_TIME, threadKeepAliveTime);
          executor.setKeepAliveTime(threadKeepAliveTime, TimeUnit.SECONDS);
      }
docs: Sets the number of seconds threads well be kept alive.
  
  @param threadKeepAliveTime number of seconds