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1   /*
2    * Copyright 2018 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.EventLoop;
19  
20  public final class NoopDnsCnameCache implements DnsCnameCache {
21  
22      public static final NoopDnsCnameCache INSTANCE = new NoopDnsCnameCache();
23  
24      private NoopDnsCnameCache() { }
25  
26      @Override
27      public String get(String hostname) {
28          return null;
29      }
30  
31      @Override
32      public void cache(String hostname, String cname, long originalTtl, EventLoop loop) {
33          // NOOP
34      }
35  
36      @Override
37      public void clear() {
38          // NOOP
39      }
40  
41      @Override
42      public boolean clear(String hostname) {
43          return false;
44      }
45  }