Showing the changes to java/pkg/sun/net/dns/ResolverConfiguration.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.net.dns; | |
| 27 | + | |
| 28 | +import java.util.List; | |
| 29 | + | |
| 30 | +/** | |
| 31 | + * The configuration of the client resolver. | |
| 32 | + * | |
| 33 | + * <p>A ResolverConfiguration is a singleton that represents the | |
| 34 | + * configuration of the client resolver. The ResolverConfiguration | |
| 35 | + * is opened by invoking the {@link #open() open} method. | |
| 36 | + * | |
| 37 | + * @since 1.4 | |
| 38 | + */ | |
| 39 | + | |
| 40 | +public abstract class ResolverConfiguration { | |
| 41 | + | |
| 42 | + private static final Object lock = new Object(); | |
| 43 | + | |
| 44 | + private static ResolverConfiguration provider; | |
| 45 | + | |
| 46 | + protected ResolverConfiguration() { } | |
| 47 | + | |
| 48 | + /** | |
| 49 | + * Opens the resolver configuration. | |
| 50 | + * | |
| 51 | + * @return the resolver configuration | |
| 52 | + */ | |
| 53 | + public static ResolverConfiguration open() { | |
| 54 | + synchronized (lock) { | |
| 55 | + if (provider == null) { | |
| 56 | + provider = new sun.net.dns.ResolverConfigurationImpl(); | |
| 57 | + } | |
| 58 | + return provider; | |
| 59 | + } | |
| 60 | + } | |
| 61 | + | |
| 62 | + /** | |
| 63 | + * Returns a list corresponding to the domain search path. The | |
| 64 | + * list is ordered by the search order used for host name lookup. | |
| 65 | + * Each element in the list returns a {@link java.lang.String} | |
| 66 | + * containing a domain name or suffix. | |
| 67 | + * | |
| 68 | + * @return list of domain names | |
| 69 | + */ | |
| 70 | + public abstract List<String> searchlist(); | |
| 71 | + | |
| 72 | + /** | |
| 73 | + * Returns a list of name servers used for host name lookup. | |
| 74 | + * Each element in the list returns a {@link java.lang.String} | |
| 75 | + * containing the textual representation of the IP address of | |
| 76 | + * the name server. | |
| 77 | + * | |
| 78 | + * @return list of the name servers | |
| 79 | + */ | |
| 80 | + public abstract List<String> nameservers(); | |
| 81 | + | |
| 82 | + | |
| 83 | + /** | |
| 84 | + * Options representing certain resolver variables of | |
| 85 | + * a {@link ResolverConfiguration}. | |
| 86 | + */ | |
| 87 | + public static abstract class Options { | |
| 88 | + | |
| 89 | + /** | |
| 90 | + * Returns the maximum number of attempts the resolver | |
| 91 | + * will connect to each name server before giving up | |
| 92 | + * and returning an error. | |
| 93 | + * | |
| 94 | + * @return the resolver attempts value or -1 is unknown | |
| 95 | + */ | |
| 96 | + public int attempts() { | |
| 97 | + return -1; | |
| 98 | + } | |
| 99 | + | |
| 100 | + /** | |
| 101 | + * Returns the basic retransmit timeout, in milliseconds, | |
| 102 | + * used by the resolver. The resolver will typically use | |
| 103 | + * an exponential backoff algorithm where the timeout is | |
| 104 | + * doubled for every retransmit attempt. The basic | |
| 105 | + * retransmit timeout, returned here, is the initial | |
| 106 | + * timeout for the exponential backoff algorithm. | |
| 107 | + * | |
| 108 | + * @return the basic retransmit timeout value or -1 | |
| 109 | + * if unknown | |
| 110 | + */ | |
| 111 | + public int retrans() { | |
| 112 | + return -1; | |
| 113 | + } | |
| 114 | + } | |
| 115 | + | |
| 116 | + /** | |
| 117 | + * Returns the {@link #Options} for the resolver. | |
| 118 | + * | |
| 119 | + * @return options for the resolver | |
| 120 | + */ | |
| 121 | + public abstract Options options(); | |
| 122 | +} | |