1 /*
2 * Copyright 2020 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 /**
19 * Represents options defined in a file of the format <a href=https://linux.die.net/man/5/resolver>etc/resolv.conf</a>.
20 */
21 final class UnixResolverOptions {
22
23 private final int ndots;
24 private final int timeout;
25 private final int attempts;
26
27 UnixResolverOptions(int ndots, int timeout, int attempts) {
28 this.ndots = ndots;
29 this.timeout = timeout;
30 this.attempts = attempts;
31 }
32
33 static UnixResolverOptions.Builder newBuilder() {
34 return new UnixResolverOptions.Builder();
35 }
36
37 /**
38 * The number of dots which must appear in a name before an initial absolute query is made.
39 * The default value is {@code 1}.
40 */
41 int ndots() {
42 return ndots;
43 }
44
45 /**
46 * The timeout of each DNS query performed by this resolver (in seconds).
47 * The default value is {@code 5}.
48 */
49 int timeout() {
50 return timeout;
51 }
52
53 /**
54 * The maximum allowed number of DNS queries to send when resolving a host name.
55 * The default value is {@code 16}.
56 */
57 int attempts() {
58 return attempts;
59 }
60
61 static final class Builder {
62
63 private int ndots = 1;
64 private int timeout = 5;
65 private int attempts = 16;
66
67 private Builder() {
68 }
69
70 void setNdots(int ndots) {
71 this.ndots = ndots;
72 }
73
74 void setTimeout(int timeout) {
75 this.timeout = timeout;
76 }
77
78 void setAttempts(int attempts) {
79 this.attempts = attempts;
80 }
81
82 UnixResolverOptions build() {
83 return new UnixResolverOptions(ndots, timeout, attempts);
84 }
85 }
86 }