//Copyright 2003-2005 Arthur van Hoff, Rick Blair
//Licensed under Apache License version 2.0
//Original license LGPL
package javax.jmdns.impl.tasks;
import java.util.Iterator;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.jmdns.impl.DNSConstants;
import javax.jmdns.impl.DNSOutgoing;
import javax.jmdns.impl.DNSQuestion;
import javax.jmdns.impl.DNSRecord;
import javax.jmdns.impl.DNSState;
import javax.jmdns.impl.JmDNSImpl;
/**
* Helper class to resolve service types.
* <p/>
* The TypeResolver queries three times consecutively for service types, and then
* removes itself from the timer.
* <p/>
* The TypeResolver will run only if JmDNS is in state ANNOUNCED.
*/
public class TypeResolver extends TimerTask
{
static Logger logger = Logger.getLogger(TypeResolver.class.getName());
/**
*
*/
private final JmDNSImpl jmDNSImpl;
/**
* @param jmDNSImpl
*/
public TypeResolver(JmDNSImpl jmDNSImpl)
{
this.jmDNSImpl = jmDNSImpl;
}
public void start(Timer timer)
{
timer.schedule(this, DNSConstants.QUERY_WAIT_INTERVAL, DNSConstants.QUERY_WAIT_INTERVAL);
}
/**
* Counts the number of queries that were sent.
*/
int count = 0;
public void run()
{
try
{
if (this.jmDNSImpl.getState() == DNSState.ANNOUNCED)
{
if (count++ < 3)
{
logger.finer("run() JmDNS querying type");
DNSOutgoing out = new DNSOutgoing(DNSConstants.FLAGS_QR_QUERY);
out.addQuestion(new DNSQuestion("_services._mdns._udp.local.", DNSConstants.TYPE_PTR, DNSConstants.CLASS_IN));
for (Iterator iterator = this.jmDNSImpl.getServiceTypes().values().iterator(); iterator.hasNext();)
{
out.addAnswer(new DNSRecord.Pointer("_services._mdns._udp.local.", DNSConstants.TYPE_PTR, DNSConstants.CLASS_IN, DNSConstants.DNS_TTL, (String) iterator.next()), 0);
}
this.jmDNSImpl.send(out);
}
else
{
// After three queries, we can quit.
this.cancel();
}
}
else
{
if (this.jmDNSImpl.getState() == DNSState.CANCELED)
{
this.cancel();
}
}
}
catch (Throwable e)
{
logger.log(Level.WARNING, "run() exception ", e);
this.jmDNSImpl.recover();
}
}
}