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1   /*
2    * Copyright 2022 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 java.net.InetSocketAddress;
19  
20  /**
21   * An infinite stream of DNS server addresses, that requests feedback to be returned to it.
22   *
23   * If query is successful timing information is provided, else a failure notification is given.
24   */
25  public interface DnsServerResponseFeedbackAddressStream extends DnsServerAddressStream {
26  
27      /**
28       * A way to provide success feedback to {@link DnsServerAddressStream} so that {@link #next()} can be tuned
29       * to return the best performing DNS server address
30       *
31       * NOTE: This is called regardless of the RCode returned by the DNS server
32       *
33       * @param address The address returned by {@link #next()} that feedback needs to be applied to
34       * @param queryResponseTimeNanos The response time of a query against the given DNS server
35       */
36      void feedbackSuccess(InetSocketAddress address, long queryResponseTimeNanos);
37  
38      /**
39       * A way to provide failure feedback to {@link DnsServerAddressStream} so that {@link #next()} cab be tuned
40       * to return the best performing DNS server address
41       *
42       * @param address The address returned by {@link #next()} that feedback needs to be applied to
43       * @param failureCause The reason the DNS query failed, can be used to penalize failures differently
44       * @param queryResponseTimeNanos The response time of a query against the given DNS server
45       */
46      void feedbackFailure(InetSocketAddress address, Throwable failureCause, long queryResponseTimeNanos);
47  }