ScriptBasedMapping,CachedDNSToSwitchMapping,AbstractDNSToSwitchMapping,DNSToSwitchMapping类层次分析
DNSToSwitchMapping是接口。定义了以下几个方法:publicinterfaceDNSToSwitchMapping{
/**
*ResolvesalistofDNS-names/IP-addressesandreturnsbackalistof
*switchinformation(networkpaths).One-to-onecorrespondencemustbe
*main