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# -*- coding: utf-8 -*-
# slip.dbus.mainloop -- mainloop wrappers
#
# Copyright © 2009, 2012 Red Hat, Inc.
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.
#
# Authors:
# Nils Philippsen <nils@redhat.com>
"""This module contains mainloop wrappers.
Currently only glib main loops are supported."""
from __future__ import absolute_import
__all__ = ("MainLoop", "set_type")
class MainLoop(object):
"""An abstract main loop wrapper class and factory.
Use MainLoop() to get a main loop wrapper object for a main loop type
previously registered with set_type(). Defaults to glib main loops.
Actual main loop wrapper classes are derived from this class."""
__mainloop_class = None
def __new__(cls, *args, **kwargs):
global _mainloop_class
if MainLoop._mainloop_class is None:
MainLoop.set_type("glib")
return super(MainLoop, cls).__new__(
MainLoop.__mainloop_class, *args, **kwargs)
@classmethod
def set_type(cls, mltype):
"""Set a main loop type for non-blocking interfaces.
mltype: "glib" (currently only glib main loops are supported)"""
if MainLoop.__mainloop_class is not None:
raise RuntimeError("The main loop type can only be set once.")
ml_type_class = {"glib": GlibMainLoop}
if mltype in ml_type_class:
MainLoop.__mainloop_class = ml_type_class[mltype]
else:
raise ValueError(
"'%s' is not one of the valid main loop types:\n%s" %
(mltype, ", ".join(ml_type_class)))
def pending(self):
"""Returns if there are pending events."""
raise NotImplementedError()
def iterate(self):
"""Iterates over one pending event."""
raise NotImplementedError()
def iterate_over_pending_events(self):
"""Iterates over all pending events."""
while self.pending():
self.iterate()
def run(self):
"""Runs the main loop."""
raise NotImplementedError()
def quit(self):
"""Quits the main loop."""
raise NotImplementedError()
class GlibMainLoop(MainLoop):
def __init__(self):
from .._wrappers import _glib
ml = _glib.MainLoop()
ctx = ml.get_context()
self._mainloop = ml
self.pending = ctx.pending
self.iterate = ctx.iteration
self.run = ml.run
self.quit = ml.quit
def set_type(mltype):
"""Set a main loop type for non-blocking interfaces.
mltype: "glib" (currently only glib main loops are supported)
Deprecated, use MainLoop.set_type() instead."""
from warnings import warn
warn("use MainLoop.set_type() instead", DeprecationWarning)
MainLoop.set_type(mltype)
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