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#!/usr/bin/python
# changeup-dispatcher - Queue and Dispatch application restart requests
#
# Author: Rodney Dawes <rodney.dawes@canonical.com>
#
# Copyright 2009 Canonical Ltd.
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 3, as published
# by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
# PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
import dbus.service
import sys
from changeup import CHANGEUP_BUS_NAME
from dbus.mainloop.glib import DBusGMainLoop
from gobject import MainLoop
DBusGMainLoop(set_as_default=True)
class Dispatcher(dbus.service.Object):
'''Service object for queuing requests.'''
def __init__(self, *args, **kwargs):
'''Initialize ourselves.'''
self.queue = []
self.path = '/queue'
self.bus = dbus.SystemBus()
self.__main = MainLoop()
name = dbus.service.BusName(CHANGEUP_BUS_NAME,
bus=self.bus)
dbus.service.Object.__init__(self, bus_name=name,
object_path=self.path)
def main(self):
"""Main loop.method."""
self.__main.run()
@dbus.service.method(CHANGEUP_BUS_NAME,
in_signature='', out_signature='')
def dispatch_requests(self):
'''Dispatch all the requests'''
for appname in self.queue:
self.RestartDispatched(appname)
self.__main.quit()
@dbus.service.method(CHANGEUP_BUS_NAME,
in_signature='s', out_signature='')
def queue_restart(self, appname):
'''Queue an application restart.'''
if appname not in self.queue:
self.queue.append(appname)
@dbus.service.signal(dbus_interface=CHANGEUP_BUS_NAME, signature='s')
def RestartDispatched(self, appname):
'''Signal for dispatching requests.'''
self.queue.remove(appname)
return appname
if __name__ == "__main__":
bus = dbus.SystemBus()
if bus.request_name(CHANGEUP_BUS_NAME, dbus.bus.NAME_FLAG_DO_NOT_QUEUE) == dbus.bus.REQUEST_NAME_REPLY_EXISTS:
sys.exit(0)
dispatcher = Dispatcher()
dispatcher.main()
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