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https://github.com/vanitasvitae/Smack.git
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665e7914f2
on package layer instead of Declarative Service (DS) approach. Restructuring and cleanup of initialization process to ensure that all internal config files are found by the corresponding bundle classloaders. SMACK-343
101 lines
3.2 KiB
Java
101 lines
3.2 KiB
Java
/**
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*
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* Copyright 2014 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util.dns.minidns;
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import java.util.LinkedList;
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import java.util.List;
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import org.jivesoftware.smack.initializer.SmackInitializer;
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import org.jivesoftware.smack.util.DNSUtil;
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import org.jivesoftware.smack.util.dns.DNSResolver;
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import org.jivesoftware.smack.util.dns.SRVRecord;
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import org.jxmpp.util.cache.ExpirationCache;
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import de.measite.minidns.Client;
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import de.measite.minidns.DNSCache;
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import de.measite.minidns.DNSMessage;
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import de.measite.minidns.Question;
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import de.measite.minidns.Record;
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import de.measite.minidns.Record.CLASS;
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import de.measite.minidns.Record.TYPE;
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import de.measite.minidns.record.SRV;
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/**
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* This implementation uses the <a href="https://github.com/rtreffer/minidns/">minidns</a> implementation for
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* resolving DNS addresses.
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*/
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public class MiniDnsResolver implements SmackInitializer, DNSResolver {
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private static final long ONE_DAY = 24*60*60*1000;
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private static final MiniDnsResolver instance = new MiniDnsResolver();
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private static final ExpirationCache<Question, DNSMessage> cache = new ExpirationCache<Question, DNSMessage>(10, ONE_DAY);
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private final Client client;
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public MiniDnsResolver() {
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client = new Client(new DNSCache() {
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@Override
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public DNSMessage get(Question question) {
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return cache.get(question);
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}
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@Override
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public void put(Question question, DNSMessage message) {
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long expirationTime = ONE_DAY;
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for (Record record : message.getAnswers()) {
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if (record.isAnswer(question)) {
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expirationTime = record.getTtl();
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break;
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}
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}
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cache.put(question, message, expirationTime);
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}
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});
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}
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public static DNSResolver getInstance() {
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return instance;
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}
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@Override
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public List<SRVRecord> lookupSRVRecords(String name) {
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List<SRVRecord> res = new LinkedList<SRVRecord>();
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DNSMessage message = client.query(name, TYPE.SRV, CLASS.IN);
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if (message == null) {
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return res;
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}
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for (Record record : message.getAnswers()) {
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SRV srv = (SRV) record.getPayload();
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res.add(new SRVRecord(srv.getName(), srv.getPort(), srv.getPriority(), srv.getWeight()));
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}
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return res;
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}
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public static void setup() {
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DNSUtil.setDNSResolver(getInstance());
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}
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@Override
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public List<Exception> initialize() {
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setup();
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return null;
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}
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}
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