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 import java.net.InetSocketAddress;
21
22 /**
23 * A noop {@link AuthoritativeDnsServerCache} that actually never caches anything.
24 */
25 public final class NoopAuthoritativeDnsServerCache implements AuthoritativeDnsServerCache {
26 public static final NoopAuthoritativeDnsServerCache INSTANCE = new NoopAuthoritativeDnsServerCache();
27
28 private NoopAuthoritativeDnsServerCache() { }
29
30 @Override
31 public DnsServerAddressStream get(String hostname) {
32 return null;
33 }
34
35 @Override
36 public void cache(String hostname, InetSocketAddress address, long originalTtl, EventLoop loop) {
37 // NOOP
38 }
39
40 @Override
41 public void clear() {
42 // NOOP
43 }
44
45 @Override
46 public boolean clear(String hostname) {
47 return false;
48 }
49 }