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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.netty5.resolver.dns;
17  
18  import io.netty5.handler.codec.dns.DnsQuestion;
19  
20  import static java.util.Objects.requireNonNull;
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 = requireNonNull(a, "a");
36          this.b = requireNonNull(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  }