DnsAddressResolverGroup.java — netty Source File

Source Code

/*
 * 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:
 *
 *   https://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.socket.DatagramChannel;
import io.netty.resolver.AddressResolver;
import io.netty.resolver.AddressResolverGroup;
import io.netty.resolver.InetSocketAddressResolver;
import io.netty.resolver.NameResolver;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.Promise;
import io.netty.util.internal.StringUtil;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * A {@link AddressResolverGroup} of {@link DnsNameResolver}s.
 */
public class DnsAddressResolverGroup extends AddressResolverGroup<InetSocketAddress> {

    private final DnsNameResolverBuilder dnsResolverBuilder;

    private final ConcurrentMap<String, Promise<InetAddress>> resolvesInProgress = new ConcurrentHashMap<>();
    private final ConcurrentMap<String, Promise<List<InetAddress>>> resolveAllsInProgress = new ConcurrentHashMap<>();

    public DnsAddressResolverGroup(DnsNameResolverBuilder dnsResolverBuilder) {
        this.dnsResolverBuilder = withSharedCaches(dnsResolverBuilder.copy());
    }

    public DnsAddressResolverGroup(
            Class<? extends DatagramChannel> channelType,
            DnsServerAddressStreamProvider nameServerProvider) {
        this.dnsResolverBuilder = withSharedCaches(new DnsNameResolverBuilder());
        dnsResolverBuilder.datagramChannelType(channelType).nameServerProvider(nameServerProvider);
    }

    public DnsAddressResolverGroup(
            ChannelFactory<? extends DatagramChannel> channelFactory,
            DnsServerAddressStreamProvider nameServerProvider) {
        this.dnsResolverBuilder = withSharedCaches(new DnsNameResolverBuilder());
// ... (74 more lines)