import javax.jmdns as zeroconf
import java.lang as lang

#
# This code shows how to use the JmDNS package from Jython
#

# First, we create a class that extends the ServiceListener interface

class JMDNSExample(zeroconf.ServiceListener):
  def __init__(self):
    # Create a JmDNS instance
    self.jmdns = zeroconf.JmDNS()

  #
  # The methods below (defined by ServiceListener) get called whenever a
  # service is added, removed, or resolved.
  #

  def serviceAdded(self, event):
    print "ADD: " + event.name + " (" + event.type + "): " + str(event.info)

    # We may not know the info necessary for contacting the service yet. If
    # Not, we need to resolve it... the service info will come back later
    # through the serviceResolved method

    if event.info == None:
      print "Resolving service info..."
      self.jmdns.requestServiceInfo(event.type, event.name, 10000)
      print "Issued resolve request."

  def serviceRemoved(self, event):
    print "REMOVE: " + event.name

  def serviceResolved(self, event):
    print "RESOLVED: " + event.name + " (" + event.type + "): " + str(event.info)

  # Call this to register your service
  def register(self, name, port, description):
    # Construct a service info with the necessary details: protocol, name,
    # what port your service is running on, and a short text description
    info = zeroconf.ServiceInfo("_cs6452._tcp.local.", name + "._cs6452._tcp.local.", port, description)

    # Unregister it, just in case it was previously registered
    #self.unregister(info)

    # Now register it through JmDNS
    self.jmdns.registerService(info)
    print "Registered service: " + str(info)

  # Call to unregister a previously registered service
  def unregister(self, info):
    self.jmdns.unregisterService(info)
    print "Unregistered old service"

  # Call to start listening for service announcements
  def listen(self):
    # set ourselves up as the listener for the "_cs6452" protocol
    self.jmdns.addServiceListener("_cs6452._tcp.local.", self)
    print "Listening for service announcements..."


if __name__ == "__main__":
  myName = lang.System.getProperty("user.name")
  port = 1234
  e = JMDNSExample()
  e.listen()
  e.register(myName, port, "This is my service")
  e.register(myName, port+1, "This is another service")