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//Licensed under Apache License version 2.0
package javax.jmdns.impl.tasks;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
import javax.jmdns.impl.DNSIncoming;
import javax.jmdns.impl.DNSOutgoing;
import javax.jmdns.impl.DNSQuestion;
import javax.jmdns.impl.DNSRecord;
import javax.jmdns.impl.JmDNSImpl;
import javax.jmdns.impl.constants.DNSConstants;
/**
* This is the root class for all task scheduled by the timer in JmDNS.
*
* @version %I%, %G%
* @author Pierre Frisch
*/
public abstract class DNSTask extends TimerTask
{
/**
*
*/
private final JmDNSImpl _jmDNSImpl;
/**
* @param jmDNSImpl
*/
protected DNSTask(JmDNSImpl jmDNSImpl)
{
super();
this._jmDNSImpl = jmDNSImpl;
}
/**
* Return the DNS associated with this task.
*
* @return associated DNS
*/
public JmDNSImpl getDns()
{
return _jmDNSImpl;
}
/**
* Start this task.
*
* @param timer
* task timer.
*/
public abstract void start(Timer timer);
/**
* Return this task name.
*
* @return task name
*/
public abstract String getName();
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString()
{
return this.getName();
}
/**
* Add a question to the message.
*
* @param out
* outgoing message
* @param rec
* DNS question
* @return outgoing message for the next question
* @throws IOException
*/
public DNSOutgoing addQuestion(DNSOutgoing out, DNSQuestion rec) throws IOException
{
DNSOutgoing newOut = out;
try
{
newOut.addQuestion(rec);
}
catch (final IOException e)
{
int flags = newOut.getFlags();
boolean multicast = newOut.isMulticast();
int maxUDPPayload = newOut.getMaxUDPPayload();
int id = newOut.getId();
newOut.setFlags(flags | DNSConstants.FLAGS_TC);
newOut.setId(id);
this._jmDNSImpl.send(newOut);
newOut = new DNSOutgoing(flags, multicast, maxUDPPayload);
newOut.addQuestion(rec);
}
return newOut;
}
/**
* Add an answer if it is not suppressed.
*
* @param out
* outgoing message
* @param in
* incoming request
* @param rec
* DNS record answer
* @return outgoing message for the next answer
* @throws IOException
*/
public DNSOutgoing addAnswer(DNSOutgoing out, DNSIncoming in, DNSRecord rec) throws IOException
{
DNSOutgoing newOut = out;
try
{
newOut.addAnswer(in, rec);
}
catch (final IOException e)
{
int flags = newOut.getFlags();
boolean multicast = newOut.isMulticast();
int maxUDPPayload = newOut.getMaxUDPPayload();
int id = newOut.getId();
newOut.setFlags(flags | DNSConstants.FLAGS_TC);
newOut.setId(id);
this._jmDNSImpl.send(newOut);
newOut = new DNSOutgoing(flags, multicast, maxUDPPayload);
newOut.addAnswer(in, rec);
}
return newOut;
}
/**
* Add an answer to the message.
*
* @param out
* outgoing message
* @param rec
* DNS record answer
* @param now
* @return outgoing message for the next answer
* @throws IOException
*/
public DNSOutgoing addAnswer(DNSOutgoing out, DNSRecord rec, long now) throws IOException
{
DNSOutgoing newOut = out;
try
{
newOut.addAnswer(rec, now);
}
catch (final IOException e)
{
int flags = newOut.getFlags();
boolean multicast = newOut.isMulticast();
int maxUDPPayload = newOut.getMaxUDPPayload();
int id = newOut.getId();
newOut.setFlags(flags | DNSConstants.FLAGS_TC);
newOut.setId(id);
this._jmDNSImpl.send(newOut);
newOut = new DNSOutgoing(flags, multicast, maxUDPPayload);
newOut.addAnswer(rec, now);
}
return newOut;
}
/**
* Add an authoritative answer to the message.
*
* @param out
* outgoing message
* @param rec
* DNS record answer
* @return outgoing message for the next answer
* @throws IOException
*/
public DNSOutgoing addAuthoritativeAnswer(DNSOutgoing out, DNSRecord rec) throws IOException
{
DNSOutgoing newOut = out;
try
{
newOut.addAuthorativeAnswer(rec);
}
catch (final IOException e)
{
int flags = newOut.getFlags();
boolean multicast = newOut.isMulticast();
int maxUDPPayload = newOut.getMaxUDPPayload();
int id = newOut.getId();
newOut.setFlags(flags | DNSConstants.FLAGS_TC);
newOut.setId(id);
this._jmDNSImpl.send(newOut);
newOut = new DNSOutgoing(flags, multicast, maxUDPPayload);
newOut.addAuthorativeAnswer(rec);
}
return newOut;
}
/**
* Add an additional answer to the record. Omit if there is no room.
*
* @param out
* outgoing message
* @param in
* incoming request
* @param rec
* DNS record answer
* @return outgoing message for the next answer
* @throws IOException
*/
public DNSOutgoing addAdditionalAnswer(DNSOutgoing out, DNSIncoming in, DNSRecord rec) throws IOException
{
DNSOutgoing newOut = out;
try
{
newOut.addAdditionalAnswer(in, rec);
}
catch (final IOException e)
{
int flags = newOut.getFlags();
boolean multicast = newOut.isMulticast();
int maxUDPPayload = newOut.getMaxUDPPayload();
int id = newOut.getId();
newOut.setFlags(flags | DNSConstants.FLAGS_TC);
newOut.setId(id);
this._jmDNSImpl.send(newOut);
newOut = new DNSOutgoing(flags, multicast, maxUDPPayload);
newOut.addAdditionalAnswer(in, rec);
}
return newOut;
}
}
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