b4be040f30
Motivation: Caching is currently nested in DnsResolver. It should also be possible to extend DnsResolver to ba able to pass a different cache on each resolution attemp. Modifications: * Introduce DnsCache, NoopDnsCache and DefaultDnsCache. The latter contains all the current caching logic that was extracted. * Introduce protected versions of doResolve and doResolveAll that can be used as extension points to build resolvers that bypass the main cache and use a different one on each resolution. Result: Isolated caching logic. Better extensibility. |
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