io.netty.resolver.dns

Class DefaultDnsServerAddressStreamProvider

java.lang.Object

io.netty.resolver.dns.DefaultDnsServerAddressStreamProvider

All Implemented Interfaces:

DnsServerAddressStreamProvider

@UnstableApi
public final class DefaultDnsServerAddressStreamProvider
extends Object
implements DnsServerAddressStreamProvider

A DnsServerAddressStreamProvider which will use predefined default DNS servers to use for DNS resolution. These defaults do not respect your host's machines defaults.

This may use the JDK's blocking DNS resolution to bootstrap the default DNS server addresses.

Field Summary

Fields

Modifier and Type	Field and Description
static DefaultDnsServerAddressStreamProvider	INSTANCE

Method Summary

Modifier and Type	Method and Description
static DnsServerAddresses	defaultAddresses() Returns the DnsServerAddresses that yields the system DNS server addresses sequentially.
static List<InetSocketAddress>	defaultAddressList() Returns the list of the system DNS server addresses.
DnsServerAddressStream	nameServerAddressStream(String hostname) Ask this provider for the name servers to query for hostname.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INSTANCE

public static final DefaultDnsServerAddressStreamProvider INSTANCE

Method Detail

nameServerAddressStream

public DnsServerAddressStream nameServerAddressStream(String hostname)

Description copied from interface: DnsServerAddressStreamProvider

Ask this provider for the name servers to query for hostname.

Specified by:

nameServerAddressStream in interface DnsServerAddressStreamProvider

Parameters:

hostname - The hostname for which to lookup the DNS server addressed to use. If this is the final DnsServerAddressStreamProvider to be queried then generally empty string or '.' correspond to the default DnsServerAddressStream.

Returns:

The DnsServerAddressStream which should be used to resolve hostname.

defaultAddressList

public static List<InetSocketAddress> defaultAddressList()

Returns the list of the system DNS server addresses. If it failed to retrieve the list of the system DNS server addresses from the environment, it will return "8.8.8.8" and "8.8.4.4", the addresses of the Google public DNS servers.

defaultAddresses

public static DnsServerAddresses defaultAddresses()

Returns the DnsServerAddresses that yields the system DNS server addresses sequentially. If it failed to retrieve the list of the system DNS server addresses from the environment, it will use "8.8.8.8" and "8.8.4.4", the addresses of the Google public DNS servers.

This method has the same effect with the following code:

 DnsServerAddresses.sequential(DnsServerAddresses.defaultAddressList());