clients.py

#coding: utf-8

import sys
import gobject

import dbus
import dbus.mainloop.glib

from service import service_name, object_path


def send_signal():
    c.send_signal(dbus_interface=service_name)
    gobject.timeout_add(2000, loop.quit)

    if sys.argv[1:] == ['--exit']:
        c.exit(dbus_interface=service_name)


def test_signal_handler(s):
    print 'in handler %s ' % s


def catch_signal(s):
    print 'catched signal %s' % s


if __name__ == '__main__':
    dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)

    bus = dbus.SessionBus()
    c = bus.get_object(service_name, object_path)
    #: callback handler?
    c.connect_to_signal('hello_signal', test_signal_handler,
                        dbus_interface=service_name)

    #: subscribe to the signal
    bus.add_signal_receiver(catch_signal, dbus_interface=service_name,
                            signal_name='hello_signal')

    #: fire the signal
    gobject.timeout_add(2000, send_signal)

    loop = gobject.MainLoop()
    loop.run()

service.py

#coding: utf-8

import gobject

import dbus
import dbus.service
import dbus.mainloop.glib


service_name = 'com.example.TestService'
object_path = '/'.join([''] + service_name.split('.'))


class Test(dbus.service.Object):
    def __init__(self, conn, object_path):
        dbus.service.Object.__init__(self, conn, object_path)

    @dbus.service.signal(service_name)
    def hello_signal(self, message):
        print message

    @dbus.service.method(service_name)
    def send_signal(self):
        self.hello_signal('hello world x2')
        return 'Signal sent'

    @dbus.service.method(service_name,
                         in_signature='', out_signature='')
    def exit(self):
        loop.quit()


if __name__ == '__main__':
    dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)

    session_bus = dbus.SessionBus()
    name = dbus.service.BusName(service_name, session_bus)
    o = Test(session_bus, object_path)

    loop = gobject.MainLoop()
    loop.run()