code: func (a *AddrBook) saveRoutine() {
  	dumpAddressTicker := time.NewTicker(dumpAddressInterval)
  out:
  	for {
  		select {
  		case <-dumpAddressTicker.C:
  			a.saveToFile(a.filePath)
  		case <-a.Quit:
  			break out
  		}
  	}
  	dumpAddressTicker.Stop()
  	a.saveToFile(a.filePath)
  	a.wg.Done()
  	log.Notice("Address handler done")
  }
docs: /* Private methods */