retrieveCurrentMappings() — netty Function Reference

Source Code

resolver-dns-classes-macos/src/main/java/io/netty/resolver/dns/macos/MacOSDnsServerAddressStreamProvider.java lines 128–166

    private static Map<String, DnsServerAddresses> retrieveCurrentMappings() {
        DnsResolver[] resolvers = resolvers();

        if (resolvers == null || resolvers.length == 0) {
            return Collections.emptyMap();
        }
        Arrays.sort(resolvers, RESOLVER_COMPARATOR);
        Map<String, DnsServerAddresses> resolverMap = new HashMap<String, DnsServerAddresses>(resolvers.length);
        for (DnsResolver resolver: resolvers) {
            // Skip mdns
            if ("mdns".equalsIgnoreCase(resolver.options())) {
                continue;
            }
            InetSocketAddress[] nameservers = resolver.nameservers();
            if (nameservers == null || nameservers.length == 0) {
                continue;
            }
            String domain = resolver.domain();
            if (domain == null) {
                // Default mapping.
                domain = StringUtil.EMPTY_STRING;
            }
            InetSocketAddress[] servers = resolver.nameservers();
            for (int a = 0; a < servers.length; a++) {
                InetSocketAddress address = servers[a];
                // Check if the default port should be used
                if (address.getPort() == 0) {
                    int port = resolver.port();
                    if (port == 0) {
                        port = 53;
                    }
                    servers[a] = new InetSocketAddress(address.getAddress(), port);
                }
            }

            resolverMap.put(domain, DnsServerAddresses.sequential(servers));
        }
        return resolverMap;
    }