io.netty.resolver.dns

Class RoundRobinDnsAddressResolverGroup

java.lang.Object

io.netty.resolver.AddressResolverGroup<InetSocketAddress>

io.netty.resolver.dns.DnsAddressResolverGroup

io.netty.resolver.dns.RoundRobinDnsAddressResolverGroup

All Implemented Interfaces:

Closeable, AutoCloseable

@UnstableApi
public class RoundRobinDnsAddressResolverGroup
extends DnsAddressResolverGroup

A AddressResolverGroup of DnsNameResolvers that supports random selection of destination addresses if multiple are provided by the nameserver. This is ideal for use in applications that use a pool of connections, for which connecting to a single resolved address would be inefficient.

Constructor Summary

Constructors

Constructor and Description
RoundRobinDnsAddressResolverGroup(ChannelFactory<? extends DatagramChannel> channelFactory, DnsServerAddressStreamProvider nameServerProvider)
RoundRobinDnsAddressResolverGroup(Class<? extends DatagramChannel> channelType, DnsServerAddressStreamProvider nameServerProvider)

Method Summary

Modifier and Type

Method and Description

protected AddressResolver<InetSocketAddress>

newAddressResolver(EventLoop eventLoop, NameResolver<InetAddress> resolver) We need to override this method, not DnsAddressResolverGroup.newNameResolver(EventLoop, ChannelFactory, DnsServerAddressStreamProvider), because we need to eliminate possible caching of NameResolver.resolve(java.lang.String) by InflightNameResolver created in DnsAddressResolverGroup.newResolver(EventLoop, ChannelFactory, DnsServerAddressStreamProvider).

Methods inherited from class io.netty.resolver.dns.DnsAddressResolverGroup

newNameResolver, newResolver, newResolver

Methods inherited from class io.netty.resolver.AddressResolverGroup

close, getResolver

Methods inherited from class java.lang.Object

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

Constructor Detail

RoundRobinDnsAddressResolverGroup

public RoundRobinDnsAddressResolverGroup(Class<? extends DatagramChannel> channelType,
                                         DnsServerAddressStreamProvider nameServerProvider)

RoundRobinDnsAddressResolverGroup

public RoundRobinDnsAddressResolverGroup(ChannelFactory<? extends DatagramChannel> channelFactory,
                                         DnsServerAddressStreamProvider nameServerProvider)

Method Detail

newAddressResolver

protected final AddressResolver<InetSocketAddress> newAddressResolver(EventLoop eventLoop,
                                                                      NameResolver<InetAddress> resolver)
                                                               throws Exception

We need to override this method, not DnsAddressResolverGroup.newNameResolver(EventLoop, ChannelFactory, DnsServerAddressStreamProvider), because we need to eliminate possible caching of NameResolver.resolve(java.lang.String) by InflightNameResolver created in DnsAddressResolverGroup.newResolver(EventLoop, ChannelFactory, DnsServerAddressStreamProvider).

Overrides:

newAddressResolver in class DnsAddressResolverGroup

Throws:

Exception