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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    *   http://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  import io.netty.util.internal.UnstableApi;
20  
21  /**
22   * Used to generate new instances of {@link DnsQueryLifecycleObserver}.
23   */
24  @UnstableApi
25  public interface DnsQueryLifecycleObserverFactory {
26      /**
27       * Create a new instance of a {@link DnsQueryLifecycleObserver}. This will be called at the start of a new query.
28       * @param question The question being asked.
29       * @return a new instance of a {@link DnsQueryLifecycleObserver}.
30       */
31      DnsQueryLifecycleObserver newDnsQueryLifecycleObserver(DnsQuestion question);
32  }