110 lines
3.5 KiB
Python
110 lines
3.5 KiB
Python
# This file is part of Gajim.
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#
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# Gajim is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published
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# by the Free Software Foundation; version 3 only.
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#
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# Gajim is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Gajim. If not, see <http://www.gnu.org/licenses/>.
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'''
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Global Events Dispatcher module.
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:author: Mateusz Biliński <mateusz@bilinski.it>
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:since: 8th August 2008
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:copyright: Copyright (2008) Mateusz Biliński <mateusz@bilinski.it>
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:copyright: Copyright (2011) Yann Leboulanger <asterix@lagaule.org>
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:license: GPL
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'''
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import logging
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import traceback
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import inspect
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from nbxmpp import NodeProcessed
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log = logging.getLogger('gajim.c.ged')
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PRECORE = 10
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CORE = 20
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POSTCORE = 30
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PREGUI = 40
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PREGUI1 = 50
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GUI1 = 60
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POSTGUI1 = 70
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PREGUI2 = 80
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GUI2 = 90
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POSTGUI2 = 100
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POSTGUI = 110
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OUT_PREGUI = 10
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OUT_PREGUI1 = 20
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OUT_GUI1 = 30
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OUT_POSTGUI1 = 40
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OUT_PREGUI2 = 50
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OUT_GUI2 = 60
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OUT_POSTGUI2 = 70
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OUT_POSTGUI = 80
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OUT_PRECORE = 90
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OUT_CORE = 100
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OUT_POSTCORE = 110
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class GlobalEventsDispatcher:
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def __init__(self):
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self.handlers = {}
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def register_event_handler(self, event_name, priority, handler):
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if event_name in self.handlers:
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handlers_list = self.handlers[event_name]
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i = 0
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for i, handler_tuple in enumerate(handlers_list):
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if priority < handler_tuple[0]:
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break
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else:
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# no event with smaller prio found, put it at the end
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i += 1
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handlers_list.insert(i, (priority, handler))
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else:
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self.handlers[event_name] = [(priority, handler)]
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def remove_event_handler(self, event_name, priority, handler):
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if event_name in self.handlers:
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try:
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self.handlers[event_name].remove((priority, handler))
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except ValueError as error:
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log.warning(
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'''Function (%s) with priority "%s" never
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registered as handler of event "%s". Couldn\'t remove.
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Error: %s''', handler, priority, event_name, error)
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def raise_event(self, event_name, *args, **kwargs):
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log.debug('Raise event: %s', event_name)
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if event_name in self.handlers:
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node_processed = False
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# Iterate over a copy of the handlers list, so while iterating
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# the original handlers list can be modified
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for _priority, handler in list(self.handlers[event_name]):
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try:
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if inspect.ismethod(handler):
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log.debug('Call handler %s on %s',
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handler.__name__,
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handler.__self__)
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else:
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log.debug('Call handler %s', handler.__name__)
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if handler(*args, **kwargs):
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return True
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except NodeProcessed:
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node_processed = True
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except Exception:
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log.error('Error while running an event handler: %s',
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handler)
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traceback.print_exc()
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if node_processed:
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raise NodeProcessed
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