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# Copyright (C) 2009 Canonical
#
# Authors:
# Michael Vogt
#
# This program 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.
#
# This program 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
# this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import dbus
import aptdaemon
class TransactionsWatcher(object):
"""
base class for objects that need to watch the aptdaemon
for transaction changes. it registers a handler for the daemon
going away and reconnects when it appears again
it also provides a "on_transaction_changed()" method
"""
def __init__(self):
# watch the daemon exit and (re)register the signal
bus = dbus.SystemBus()
self._owner_watcher = bus.watch_name_owner(
"org.debian.apt", self._register_active_transactions_watch)
def _register_active_transactions_watch(self, connection):
#print "_register_active_transactions_watch", connection
apt_daemon = aptdaemon.client.get_aptdaemon()
apt_daemon.connect_to_signal("ActiveTransactionsChanged",
self.on_transactions_changed)
current, queued = apt_daemon.GetActiveTransactions()
self.on_transactions_changed(current, queued)
def on_transactions_changed(self, current, queue):
" stub implementation "
pass
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