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1   /*
2    * Copyright 2024 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.util.concurrent.FastThreadLocal;
19  
20  import java.net.InetSocketAddress;
21  
22  /**
23   * A thread local based address stream for a specific hostname.
24   */
25  final class ThreadLocalNameServerAddressStream implements DnsServerAddressStream {
26  
27      private final String hostname;
28      private final DnsServerAddressStreamProvider dnsServerAddressStreamProvider;
29      private final FastThreadLocal<DnsServerAddressStream> threadLocal = new FastThreadLocal<DnsServerAddressStream>() {
30          @Override
31          protected DnsServerAddressStream initialValue() {
32              return dnsServerAddressStreamProvider.nameServerAddressStream(hostname);
33          }
34      };
35  
36      ThreadLocalNameServerAddressStream(DnsServerAddressStreamProvider dnsServerAddressStreamProvider) {
37          this(dnsServerAddressStreamProvider, "");
38      }
39  
40      ThreadLocalNameServerAddressStream(DnsServerAddressStreamProvider dnsServerAddressStreamProvider, String hostname) {
41          this.dnsServerAddressStreamProvider = dnsServerAddressStreamProvider;
42          this.hostname = hostname;
43      }
44  
45      @Override
46      public InetSocketAddress next() {
47          return threadLocal.get().next();
48      }
49  
50      @Override
51      public DnsServerAddressStream duplicate() {
52          return new ThreadLocalNameServerAddressStream(dnsServerAddressStreamProvider, hostname);
53      }
54  
55      @Override
56      public int size() {
57          return threadLocal.get().size();
58      }
59  }