io.lettuce.core.resource

Interface DnsResolver

All Known Implementing Classes:

DirContextDnsResolver, DnsResolvers

public interface DnsResolver

Users may implement this interface to override the normal DNS lookup offered by the OS.

Since:

4.2

Author:

Mark Paluch

Method Summary

Modifier and Type	Method and Description
static DnsResolver	jvmDefault() Java VM default resolver.
InetAddress[]	resolve(String host) Returns the IP address for the specified host name.
static DnsResolver	unresolved() Non-resolving DnsResolver.

Method Detail

jvmDefault

static DnsResolver jvmDefault()

Java VM default resolver.

Since:

5.1

unresolved

static DnsResolver unresolved()

Non-resolving DnsResolver. Returns an empty InetAddress to indicate an unresolved address.

Since:

5.1

See Also:

InetSocketAddress.createUnresolved(String, int)

resolve

InetAddress[] resolve(String host)
               throws UnknownHostException

Returns the IP address for the specified host name.

Parameters:

host - the hostname, must not be empty or null.

Returns:

array of one or more adresses. An empty array indicates that DNS resolution is not supported by this DnsResolver and should happen by netty, see InetSocketAddress.createUnresolved(String, int).

Throws:

UnknownHostException - if the given host is not recognized or the associated IP address cannot be used to build an InetAddress instance