public boolean cancel() {
// Remove association from host name to this
if (this.jmDNSImpl.getTask() == this) {
this.jmDNSImpl.setTask(null);
}
// Remove associations from services to this
synchronized (this.jmDNSImpl) {
for (Iterator i = this.jmDNSImpl.getServices().values().iterator(); i.hasNext(); ) {
ServiceInfoImpl info = (ServiceInfoImpl) i.next();
if (info.getTask() == this) {
info.setTask(null);
}
}
}
return super.cancel();
}
public void run() {
synchronized (this.jmDNSImpl.getIoLock()) {
DNSOutgoing out = null;
try {
// send probes for JmDNS itself
if (this.jmDNSImpl.getState() == taskState && this.jmDNSImpl.getTask() == this) {
if (out == null) {
out = new DNSOutgoing(DNSConstants.FLAGS_QR_QUERY);
}
out.addQuestion(
new DNSQuestion(
this.jmDNSImpl.getLocalHost().getName(),
DNSConstants.TYPE_ANY,
DNSConstants.CLASS_IN));
this.jmDNSImpl.getLocalHost().addAddressRecords(out, true);
this.jmDNSImpl.advanceState();
}
// send probes for services
// Defensively copy the services into a local list,
// to prevent race conditions with methods registerService
// and unregisterService.
List list;
synchronized (this.jmDNSImpl) {
list = new LinkedList(this.jmDNSImpl.getServices().values());
}
for (Iterator i = list.iterator(); i.hasNext(); ) {
ServiceInfoImpl info = (ServiceInfoImpl) i.next();
synchronized (info) {
if (info.getState() == taskState && info.getTask() == this) {
info.advanceState();
if (out == null) {
out = new DNSOutgoing(DNSConstants.FLAGS_QR_QUERY);
out.addQuestion(
new DNSQuestion(
info.getQualifiedName(), DNSConstants.TYPE_ANY, DNSConstants.CLASS_IN));
}
// the "unique" flag should be not set here because these
// answers haven't been proven unique yet
// this means the record will not exactly match the
// announcement record
out.addAuthorativeAnswer(
new DNSRecord.Service(
info.getQualifiedName(),
DNSConstants.TYPE_SRV,
DNSConstants.CLASS_IN,
DNSConstants.DNS_TTL,
info.getPriority(),
info.getWeight(),
info.getPort(),
this.jmDNSImpl.getLocalHost().getName()));
}
}
}
if (out != null) {
this.jmDNSImpl.send(out);
} else {
// If we have nothing to send, another timer taskState ahead
// of us has done the job for us. We can cancel.
cancel();
return;
}
} catch (Throwable e) {
this.jmDNSImpl.recover();
}
taskState = taskState.advance();
if (!taskState.isProbing()) {
cancel();
this.jmDNSImpl.startAnnouncer();
}
}
}