1 /*
2 * Copyright 2017 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.handler.codec.dns.DnsQuestion;
19
20 import static io.netty.util.internal.ObjectUtil.checkNotNull;
21
22 /**
23 * Combines two {@link DnsQueryLifecycleObserverFactory} into a single {@link DnsQueryLifecycleObserverFactory}.
24 */
25 public final class BiDnsQueryLifecycleObserverFactory implements DnsQueryLifecycleObserverFactory {
26 private final DnsQueryLifecycleObserverFactory a;
27 private final DnsQueryLifecycleObserverFactory b;
28
29 /**
30 * Create a new instance.
31 * @param a The {@link DnsQueryLifecycleObserverFactory} that will receive events first.
32 * @param b The {@link DnsQueryLifecycleObserverFactory} that will receive events second.
33 */
34 public BiDnsQueryLifecycleObserverFactory(DnsQueryLifecycleObserverFactory a, DnsQueryLifecycleObserverFactory b) {
35 this.a = checkNotNull(a, "a");
36 this.b = checkNotNull(b, "b");
37 }
38
39 @Override
40 public DnsQueryLifecycleObserver newDnsQueryLifecycleObserver(DnsQuestion question) {
41 return new BiDnsQueryLifecycleObserver(a.newDnsQueryLifecycleObserver(question),
42 b.newDnsQueryLifecycleObserver(question));
43 }
44 }