addrbook.go
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")
}
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")
}
/* Private methods */