88 lines
3.6 KiB
Java
88 lines
3.6 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.resolver.dns;
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import io.netty.channel.ChannelFactory;
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import io.netty.channel.EventLoop;
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import io.netty.channel.ReflectiveChannelFactory;
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import io.netty.channel.socket.DatagramChannel;
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import io.netty.resolver.AddressResolver;
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import io.netty.resolver.AddressResolverGroup;
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import io.netty.util.concurrent.EventExecutor;
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import io.netty.util.internal.StringUtil;
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import java.net.InetSocketAddress;
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import static io.netty.resolver.dns.DnsNameResolver.ANY_LOCAL_ADDR;
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/**
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* A {@link AddressResolverGroup} of {@link DnsNameResolver}s.
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*/
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public class DnsAddressResolverGroup extends AddressResolverGroup<InetSocketAddress> {
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private final ChannelFactory<? extends DatagramChannel> channelFactory;
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private final InetSocketAddress localAddress;
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private final DnsServerAddresses nameServerAddresses;
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public DnsAddressResolverGroup(
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Class<? extends DatagramChannel> channelType, DnsServerAddresses nameServerAddresses) {
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this(channelType, ANY_LOCAL_ADDR, nameServerAddresses);
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}
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public DnsAddressResolverGroup(
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Class<? extends DatagramChannel> channelType,
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InetSocketAddress localAddress, DnsServerAddresses nameServerAddresses) {
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this(new ReflectiveChannelFactory<DatagramChannel>(channelType), localAddress, nameServerAddresses);
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}
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public DnsAddressResolverGroup(
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ChannelFactory<? extends DatagramChannel> channelFactory, DnsServerAddresses nameServerAddresses) {
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this(channelFactory, ANY_LOCAL_ADDR, nameServerAddresses);
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}
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public DnsAddressResolverGroup(
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ChannelFactory<? extends DatagramChannel> channelFactory,
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InetSocketAddress localAddress, DnsServerAddresses nameServerAddresses) {
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this.channelFactory = channelFactory;
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this.localAddress = localAddress;
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this.nameServerAddresses = nameServerAddresses;
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}
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@Override
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protected final AddressResolver<InetSocketAddress> newResolver(EventExecutor executor) throws Exception {
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if (!(executor instanceof EventLoop)) {
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throw new IllegalStateException(
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"unsupported executor type: " + StringUtil.simpleClassName(executor) +
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" (expected: " + StringUtil.simpleClassName(EventLoop.class));
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}
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return newResolver((EventLoop) executor, channelFactory, localAddress, nameServerAddresses);
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}
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/**
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* Creates a new {@link DnsNameResolver}. Override this method to create an alternative {@link DnsNameResolver}
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* implementation or override the default configuration.
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*/
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protected AddressResolver<InetSocketAddress> newResolver(
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EventLoop eventLoop, ChannelFactory<? extends DatagramChannel> channelFactory,
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InetSocketAddress localAddress, DnsServerAddresses nameServerAddresses) throws Exception {
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return new DnsNameResolver(eventLoop, channelFactory, localAddress, nameServerAddresses)
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.asAddressResolver();
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}
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}
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