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1   /*
2    * Copyright 2019 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.resolver.dns;
17  
18  import io.netty.channel.AddressedEnvelope;
19  import io.netty.channel.Channel;
20  import io.netty.handler.codec.dns.DefaultDnsQuery;
21  import io.netty.handler.codec.dns.DnsQuery;
22  import io.netty.handler.codec.dns.DnsQuestion;
23  import io.netty.handler.codec.dns.DnsRecord;
24  import io.netty.handler.codec.dns.DnsResponse;
25  import io.netty.util.concurrent.Promise;
26  
27  import java.net.InetSocketAddress;
28  
29  final class TcpDnsQueryContext extends DnsQueryContext {
30  
31      private final Channel channel;
32  
33      TcpDnsQueryContext(DnsNameResolver parent, Channel channel, InetSocketAddress nameServerAddr, DnsQuestion question,
34                         DnsRecord[] additionals, Promise<AddressedEnvelope<DnsResponse, InetSocketAddress>> promise) {
35          super(parent, nameServerAddr, question, additionals, promise);
36          this.channel = channel;
37      }
38  
39      @Override
40      protected DnsQuery newQuery(int id) {
41          return new DefaultDnsQuery(id);
42      }
43  
44      @Override
45      protected Channel channel() {
46          return channel;
47      }
48  
49      @Override
50      protected String protocol() {
51          return "TCP";
52      }
53  }