// Copyright 2003-2005 Arthur van Hoff, Rick Blair
// Licensed under Apache License version 2.0
// Original license LGPL
package javax.jmdns.impl.tasks.resolver;
import java.io.IOException;
import javax.jmdns.impl.DNSEntry;
import javax.jmdns.impl.DNSOutgoing;
import javax.jmdns.impl.DNSQuestion;
import javax.jmdns.impl.DNSRecord;
import javax.jmdns.impl.JmDNSImpl;
import javax.jmdns.impl.ServiceInfoImpl;
import javax.jmdns.impl.constants.DNSRecordClass;
import javax.jmdns.impl.constants.DNSRecordType;
/**
* The ServiceInfoResolver queries up to three times consecutively for a service
* info, and then removes itself from the timer.
* <p/>
* The ServiceInfoResolver will run only if JmDNS is in state ANNOUNCED. REMIND:
* Prevent having multiple service resolvers for the same info in the timer
* queue.
*/
public class ServiceInfoResolver extends DNSResolverTask
{
private final ServiceInfoImpl _info;
public ServiceInfoResolver(JmDNSImpl jmDNSImpl, ServiceInfoImpl info)
{
super(jmDNSImpl);
this._info = info;
info.setDns(this.getDns());
this.getDns().addListener(
info,
DNSQuestion.newQuestion(info.getQualifiedName(), DNSRecordType.TYPE_ANY,
DNSRecordClass.CLASS_IN, DNSRecordClass.NOT_UNIQUE));
}
/*
* (non-Javadoc)
*
* @see javax.jmdns.impl.tasks.DNSTask#getName()
*/
@Override
public String getName()
{
return "ServiceInfoResolver("
+ (this.getDns() != null ? this.getDns().getName() : "") + ")";
}
/*
* (non-Javadoc)
*
* @see java.util.TimerTask#cancel()
*/
@Override
public boolean cancel()
{
// We should not forget to remove the listener
boolean result = super.cancel();
if (!_info.isPersistent())
{
this.getDns().removeListener(_info);
}
return result;
}
/*
* (non-Javadoc)
*
* @see
* javax.jmdns.impl.tasks.Resolver#addAnswers(javax.jmdns.impl.DNSOutgoing)
*/
@Override
protected DNSOutgoing addAnswers(DNSOutgoing out) throws IOException
{
DNSOutgoing newOut = out;
if (!_info.hasData())
{
long now = System.currentTimeMillis();
newOut = this.addAnswer(
newOut,
(DNSRecord) this
.getDns()
.getCache()
.getDNSEntry(_info.getQualifiedName(), DNSRecordType.TYPE_SRV,
DNSRecordClass.CLASS_IN), now);
newOut = this.addAnswer(
newOut,
(DNSRecord) this
.getDns()
.getCache()
.getDNSEntry(_info.getQualifiedName(), DNSRecordType.TYPE_TXT,
DNSRecordClass.CLASS_IN), now);
if (_info.getServer().length() > 0)
{
for (DNSEntry addressEntry : this
.getDns()
.getCache()
.getDNSEntryList(_info.getServer(), DNSRecordType.TYPE_A,
DNSRecordClass.CLASS_IN))
{
newOut = this.addAnswer(newOut, (DNSRecord) addressEntry, now);
}
for (DNSEntry addressEntry : this
.getDns()
.getCache()
.getDNSEntryList(_info.getServer(), DNSRecordType.TYPE_AAAA,
DNSRecordClass.CLASS_IN))
{
newOut = this.addAnswer(newOut, (DNSRecord) addressEntry, now);
}
}
}
return newOut;
}
/*
* (non-Javadoc)
*
* @see
* javax.jmdns.impl.tasks.Resolver#addQuestions(javax.jmdns.impl.DNSOutgoing
* )
*/
@Override
protected DNSOutgoing addQuestions(DNSOutgoing out) throws IOException
{
DNSOutgoing newOut = out;
if (!_info.hasData())
{
newOut = this.addQuestion(newOut, DNSQuestion.newQuestion(
_info.getQualifiedName(), DNSRecordType.TYPE_SRV,
DNSRecordClass.CLASS_IN, DNSRecordClass.NOT_UNIQUE));
newOut = this.addQuestion(newOut, DNSQuestion.newQuestion(
_info.getQualifiedName(), DNSRecordType.TYPE_TXT,
DNSRecordClass.CLASS_IN, DNSRecordClass.NOT_UNIQUE));
if (_info.getServer().length() > 0)
{
newOut = this.addQuestion(newOut, DNSQuestion.newQuestion(
_info.getServer(), DNSRecordType.TYPE_A, DNSRecordClass.CLASS_IN,
DNSRecordClass.NOT_UNIQUE));
newOut = this.addQuestion(newOut, DNSQuestion.newQuestion(
_info.getServer(), DNSRecordType.TYPE_AAAA, DNSRecordClass.CLASS_IN,
DNSRecordClass.NOT_UNIQUE));
}
}
return newOut;
}
/*
* (non-Javadoc)
*
* @see javax.jmdns.impl.tasks.Resolver#description()
*/
@Override
protected String description()
{
return "querying service info: "
+ (_info != null ? _info.getQualifiedName() : "null");
}
}