add ged.py file

src/common/ged.py

+# -*- coding: utf-8 -*-
+
+## This file is part of Gajim.
+##
+## Gajim is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published
+## by the Free Software Foundation; version 3 only.
+##
+## Gajim is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY 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 Gajim.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+'''
+Global Events Dispatcher module.
+
+:author: Mateusz Biliński <mateusz@bilinski.it>
+:since: 8th August 2008
+:copyright: Copyright (2008) Mateusz Biliński <mateusz@bilinski.it>
+:license: GPL
+'''
+
+import logging
+log = logging.getLogger('gajim.common.ged')
+
+PRECORE = 30
+CORE = 40
+POSTCORE = 50
+
+class GlobalEventsDispatcher(object):
+
+	def __init__(self):
+		self.handlers = {}
+
+	def register_event_handler(self, event_name, priority, handler):
+		if event_name in self.handlers:
+			handlers_list = self.handlers[event_name]
+			i = 0
+			for i,h in enumerate(handlers_list):
+				if priority < h[0]:
+					break
+
+			handlers_list.insert(i, (priority, handler))
+		else:
+			self.handlers[event_name] = [(priority, handler)]
+
+	def remove_event_handler(self, event_name, priority, handler):
+		if event_name in self.handlers:
+			try:
+				self.handlers[event_name].remove((priority, handler))
+			except ValueError, error:
+				log.warn('''Function (%s) with priority "%s" never registered 
+				as handler of event "%s". Couldn\'t remove. Error: %s'''
+						  %(handler, priority, event_name, error))
+
+	def raise_event(self, event_name, *args, **kwargs):
+		log.debug('%s\nArgs: %s'%(event_name, str(args)))
+		if event_name in self.handlers:
+			for priority, handler in self.handlers[event_name]:
+				handler(*args, **kwargs)