laditools/controller.py

   1 #!/usr/bin/python
   2 # LADITools - Linux Audio Desktop Integration Tools
   3 # Copyright (C) 2012 Alessio Treglia <quadrispro@ubuntu.com>
   4 #
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 import dbus
  19 import sys
  20
  21 class LadiController(object):
  22     """Wrap common routines used by D-Bus objects.
  23
  24     It is recommended to use one of the available implementations
  25     instead of creating instances of this class.
  26     """
  27
  28     def __init__(self, dbus_type, service_name, obj_path, iface_name, args = None):
  29         # Connect to the bus
  30         self.bus = getattr(dbus, dbus_type)()
  31         self.controller_obj = self.bus.get_object (service_name, obj_path)
  32         self.controller_iface = dbus.Interface (self.controller_obj, iface_name)
  33
  34     def is_available (self):
  35         """Check if the service is available."""
  36         try:
  37             self.is_started ()
  38             return True
  39         except Exception, err:
  40             sys.stderr.write(str(err) + '\n')
  41             sys.stderr.flush()
  42             return False
  43
  44     def is_started (self):
  45         """Check if the service is running."""
  46         return self.controller_iface.is_started ()
  47
  48     def start(self):
  49         """Start the service."""
  50         self.controller_iface.start()
  51
  52     def stop(self):
  53         """Stop the service."""
  54         self.controller_iface.stop()
  55
  56     def kill(self):
  57         """Kill the service."""
  58         self.controller_iface.exit()