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