66 lines
2.0 KiB
Python
66 lines
2.0 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 by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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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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from gi.repository import Gio, GObject
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'''
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https://discourse.gnome.org/t/gtk-threading-problem-with-glib-idle-add/13597/5
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https://github.com/gdm-settings/gdm-settings/blob/f245d3000200fa6be2a35c7f6ac45b131dadb5d6/src/utils.py#L116..L162
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'''
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class BackgroundTask(GObject.Object):
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__gtype_name__ = 'BackgroundTask'
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def __init__(self, function, finish_callback, **kwargs):
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super().__init__(**kwargs)
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self.function = function
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self.finish_callback = finish_callback
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self._current = None
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def start(self):
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if self._current:
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AlreadyRunningError('Task is already running')
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finish_callback = lambda self, task, nothing: self.finish_callback()
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task = Gio.Task.new(self, None, finish_callback, None)
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task.run_in_thread(self._thread_cb)
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self._current = task
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@staticmethod
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def _thread_cb(task, self, task_data, cancellable):
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try:
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retval = self.function()
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task.return_value(retval)
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except Exception as e:
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task.return_value(e)
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def finish(self):
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task = self._current
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self._current = None
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if not Gio.Task.is_valid(task, self):
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raise InvalidGioTaskError()
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value = task.propagate_value().value
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if isinstance(value, Exception):
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raise value
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return value
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