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 }