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Because of OSGi, no subproject of Smack (which is the same as a OSGi bundle) must export a package that is already exported by another subproject. Therefore it was necessary to move the TCP and BOSH code into their own packages: org.jivesoftware.smack.(tcp|bosh). OSGi classloader restrictions also made it necessary to create a Declarative Service for smack-extensions, smack-experimental and smack-lagacy (i.e. smack subprojects which should be initialized), in order to initialize them accordingly, as smack-core is, when used in a OSGi environment, unable to load and initialize classes from other smack bundles. OSGi's "Service Component Runtime" (SCR) will now take care of running the initialization code of the particular Smack bundle by activating its Declarative Service. That is also the reason why most initialization related method now have an additional classloader argument. Note that due the refactoring, some ugly changes in XMPPTCPConnection and its PacketReader and PacketWriter where necessary.
97 lines
3.2 KiB
Java
97 lines
3.2 KiB
Java
/**
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*
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* Copyright 2013-2014 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.javax;
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import java.util.ArrayList;
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import java.util.Hashtable;
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import java.util.List;
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import javax.naming.NamingEnumeration;
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import javax.naming.NamingException;
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import javax.naming.directory.Attribute;
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import javax.naming.directory.Attributes;
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import javax.naming.directory.DirContext;
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import javax.naming.directory.InitialDirContext;
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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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/**
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* A DNS resolver (mostly for SRV records), which makes use of the API provided in the javax.* namespace.
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*
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* @author Florian Schmaus
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*
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*/
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public class JavaxResolver implements DNSResolver {
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private static JavaxResolver instance;
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private static DirContext dirContext;
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static {
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try {
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Hashtable<String, String> env = new Hashtable<String, String>();
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env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
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dirContext = new InitialDirContext(env);
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} catch (Exception e) {
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// Ignore.
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}
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// Try to set this DNS resolver as primary one
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DNSUtil.setDNSResolver(getInstance());
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}
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private JavaxResolver() {
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}
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public static DNSResolver getInstance() {
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if (instance == null && isSupported()) {
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instance = new JavaxResolver();
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}
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return instance;
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}
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public static boolean isSupported() {
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return dirContext != null;
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}
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@Override
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public List<SRVRecord> lookupSRVRecords(String name) throws NamingException {
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List<SRVRecord> res = new ArrayList<SRVRecord>();
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Attributes dnsLookup = dirContext.getAttributes(name, new String[] { "SRV" });
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Attribute srvAttribute = dnsLookup.get("SRV");
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if (srvAttribute == null)
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return res;
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@SuppressWarnings("unchecked")
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NamingEnumeration<String> srvRecords = (NamingEnumeration<String>) srvAttribute.getAll();
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while (srvRecords.hasMore()) {
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String srvRecordString = srvRecords.next();
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String[] srvRecordEntries = srvRecordString.split(" ");
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int priority = Integer.parseInt(srvRecordEntries[srvRecordEntries.length - 4]);
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int port = Integer.parseInt(srvRecordEntries[srvRecordEntries.length - 2]);
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int weight = Integer.parseInt(srvRecordEntries[srvRecordEntries.length - 3]);
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String host = srvRecordEntries[srvRecordEntries.length - 1];
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SRVRecord srvRecord = new SRVRecord(host, port, priority, weight);
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res.add(srvRecord);
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}
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return res;
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}
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}
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