| //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.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; |
| import javax.jmdns.impl.ServiceInfoImpl; |
| |
| /** |
| * 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 TimerTask |
| { |
| // static Logger logger = Logger.getLogger(ServiceInfoResolver.class.getName()); |
| |
| /** |
| * |
| */ |
| private final JmDNSImpl jmDNSImpl; |
| /** |
| * Counts the number of queries being sent. |
| */ |
| int count = 0; |
| private ServiceInfoImpl info; |
| |
| public ServiceInfoResolver(JmDNSImpl jmDNSImpl, ServiceInfoImpl info) |
| { |
| this.jmDNSImpl = jmDNSImpl; |
| this.info = info; |
| info.setDns(this.jmDNSImpl); |
| this.jmDNSImpl.addListener(info, new DNSQuestion(info.getQualifiedName(), DNSConstants.TYPE_ANY, DNSConstants.CLASS_IN)); |
| } |
| |
| public void start(Timer timer) |
| { |
| timer.schedule(this, DNSConstants.QUERY_WAIT_INTERVAL, DNSConstants.QUERY_WAIT_INTERVAL); |
| } |
| |
| public void run() |
| { |
| try |
| { |
| if (this.jmDNSImpl.getState() == DNSState.ANNOUNCED) |
| { |
| if (count++ < 3 && !info.hasData()) |
| { |
| long now = System.currentTimeMillis(); |
| DNSOutgoing out = new DNSOutgoing(DNSConstants.FLAGS_QR_QUERY); |
| out.addQuestion(new DNSQuestion(info.getQualifiedName(), DNSConstants.TYPE_SRV, DNSConstants.CLASS_IN)); |
| out.addQuestion(new DNSQuestion(info.getQualifiedName(), DNSConstants.TYPE_TXT, DNSConstants.CLASS_IN)); |
| if (info.getServer() != null) |
| { |
| out.addQuestion(new DNSQuestion(info.getServer(), DNSConstants.TYPE_A, DNSConstants.CLASS_IN)); |
| } |
| out.addAnswer((DNSRecord) this.jmDNSImpl.getCache().get(info.getQualifiedName(), DNSConstants.TYPE_SRV, DNSConstants.CLASS_IN), now); |
| out.addAnswer((DNSRecord) this.jmDNSImpl.getCache().get(info.getQualifiedName(), DNSConstants.TYPE_TXT, DNSConstants.CLASS_IN), now); |
| if (info.getServer() != null) |
| { |
| out.addAnswer((DNSRecord) this.jmDNSImpl.getCache().get(info.getServer(), DNSConstants.TYPE_A, DNSConstants.CLASS_IN), now); |
| } |
| this.jmDNSImpl.send(out); |
| } |
| else |
| { |
| // After three queries, we can quit. |
| this.cancel(); |
| this.jmDNSImpl.removeListener(info); |
| } |
| } |
| else |
| { |
| if (this.jmDNSImpl.getState() == DNSState.CANCELED) |
| { |
| this.cancel(); |
| this.jmDNSImpl.removeListener(info); |
| } |
| } |
| } |
| catch (Throwable e) |
| { |
| // logger.log(Level.WARNING, "run() exception ", e); |
| this.jmDNSImpl.recover(); |
| } |
| } |
| } |