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// Copyright 2003-2005 Arthur van Hoff, Rick Blair
// Licensed under Apache License version 2.0
// Original license LGPL
package javax.jmdns.impl.tasks.state;
import java.io.IOException;
import java.util.Timer;
import java.util.logging.Logger;
import javax.jmdns.impl.DNSOutgoing;
import javax.jmdns.impl.DNSRecord;
import javax.jmdns.impl.JmDNSImpl;
import javax.jmdns.impl.ServiceInfoImpl;
import javax.jmdns.impl.constants.DNSConstants;
import javax.jmdns.impl.constants.DNSRecordClass;
import javax.jmdns.impl.constants.DNSState;
/**
* The Canceler sends two announces with TTL=0 for the specified services.
*/
public class Canceler extends DNSStateTask {
static Logger logger = Logger.getLogger(Canceler.class.getName());
public Canceler(JmDNSImpl jmDNSImpl) {
super(jmDNSImpl, 0);
this.setTaskState(DNSState.CANCELING_1);
this.associate(DNSState.CANCELING_1);
}
/*
* (non-Javadoc)
* @see javax.jmdns.impl.tasks.DNSTask#getName()
*/
@Override
public String getName() {
return "Canceler(" + (this.getDns() != null ? this.getDns().getName() : "") + ")";
}
/*
* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return super.toString() + " state: " + this.getTaskState();
}
/*
* (non-Javadoc)
* @see javax.jmdns.impl.tasks.DNSTask#start(java.util.Timer)
*/
@Override
public void start(Timer timer) {
timer.schedule(this, 0, DNSConstants.ANNOUNCE_WAIT_INTERVAL);
}
/*
* (non-Javadoc)
* @see java.util.TimerTask#cancel()
*/
@Override
public boolean cancel() {
this.removeAssociation();
return super.cancel();
}
/*
* (non-Javadoc)
* @see javax.jmdns.impl.tasks.state.DNSStateTask#getTaskDescription()
*/
@Override
public String getTaskDescription() {
return "canceling";
}
/*
* (non-Javadoc)
* @see javax.jmdns.impl.tasks.state.DNSStateTask#checkRunCondition()
*/
@Override
protected boolean checkRunCondition() {
return true;
}
/*
* (non-Javadoc)
* @see javax.jmdns.impl.tasks.state.DNSStateTask#createOugoing()
*/
@Override
protected DNSOutgoing createOugoing() {
return new DNSOutgoing(DNSConstants.FLAGS_QR_RESPONSE | DNSConstants.FLAGS_AA);
}
/*
* (non-Javadoc)
* @see javax.jmdns.impl.tasks.state.DNSStateTask#buildOutgoingForDNS(javax.jmdns.impl.DNSOutgoing)
*/
@Override
protected DNSOutgoing buildOutgoingForDNS(DNSOutgoing out) throws IOException {
DNSOutgoing newOut = out;
for (DNSRecord answer : this.getDns().getLocalHost().answers(DNSRecordClass.UNIQUE, this.getTTL())) {
newOut = this.addAnswer(newOut, null, answer);
}
return newOut;
}
/*
* (non-Javadoc)
* @see javax.jmdns.impl.tasks.state.DNSStateTask#buildOutgoingForInfo(javax.jmdns.impl.ServiceInfoImpl, javax.jmdns.impl.DNSOutgoing)
*/
@Override
protected DNSOutgoing buildOutgoingForInfo(ServiceInfoImpl info, DNSOutgoing out) throws IOException {
DNSOutgoing newOut = out;
for (DNSRecord answer : info.answers(DNSRecordClass.UNIQUE, this.getTTL(), this.getDns().getLocalHost())) {
newOut = this.addAnswer(newOut, null, answer);
}
return newOut;
}
/*
* (non-Javadoc)
* @see javax.jmdns.impl.tasks.state.DNSStateTask#recoverTask(java.lang.Throwable)
*/
@Override
protected void recoverTask(Throwable e) {
this.getDns().recover();
}
/*
* (non-Javadoc)
* @see javax.jmdns.impl.tasks.state.DNSStateTask#advanceTask()
*/
@Override
protected void advanceTask() {
this.setTaskState(this.getTaskState().advance());
if (!this.getTaskState().isCanceling()) {
cancel();
}
}
}
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