src/gpodder/services.py

   1 # -*- coding: utf-8 -*-
   2 #
   3 # gPodder - A media aggregator and podcast client
   4 # Copyright (c) 2005-2018 The gPodder Team
   5 #
   6 # gPodder is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # gPodder is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 #
  19
  20
  21 #
  22 #  services.py -- Core Services for gPodder
  23 #  Thomas Perl <thp@perli.net>   2007-08-24
  24 #
  25 #
  26
  27 import gpodder
  28 from gpodder import util
  29
  30 _ = gpodder.gettext
  31
  32
  33 class ObservableService(object):
  34     def __init__(self, signal_names=[]):
  35         self.observers = {}
  36         for signal in signal_names:
  37             self.observers[signal] = []
  38
  39     def register(self, signal_name, observer):
  40         if signal_name in self.observers:
  41             if observer not in self.observers[signal_name]:
  42                 self.observers[signal_name].append(observer)
  43                 return True
  44
  45         return False
  46
  47     def unregister(self, signal_name, observer):
  48         if signal_name in self.observers:
  49             if observer in self.observers[signal_name]:
  50                 self.observers[signal_name].remove(observer)
  51                 return True
  52
  53         return False
  54
  55     def notify(self, signal_name, *args):
  56         if signal_name in self.observers:
  57             for observer in self.observers[signal_name]:
  58                 util.idle_add(observer, *args)
  59
  60             return True
  61
  62         return False