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75 lines
1.8 KiB
Python
75 lines
1.8 KiB
Python
# -*- coding: utf-8; mode: python; -*-
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#
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# GStreamer Development Utilities
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#
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# Copyright (C) 2007 René Stadler <mail@renestadler.de>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 3 of the License, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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# more details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program. If not, see <http://www.gnu.org/licenses/>.
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"""GStreamer Development Utilities Common Data module."""
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import gi
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from gi.repository import GObject
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class Dispatcher (object):
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def __call__(self, iterator):
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raise NotImplementedError("derived classes must override this method")
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def cancel(self):
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pass
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class DefaultDispatcher (Dispatcher):
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def __call__(self, iterator):
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for x in iterator:
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pass
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class GSourceDispatcher (Dispatcher):
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def __init__(self):
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Dispatcher.__init__(self)
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self.source_id = None
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def __call__(self, iterator):
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if self.source_id is not None:
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GObject.source_remove(self.source_id)
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def iteration():
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r = iterator.__next__()
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if not r:
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self.source_id = None
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return r
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self.source_id = GObject.idle_add(
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iteration, priority=GObject.PRIORITY_LOW)
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def cancel(self):
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if self.source_id is None:
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return
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GObject.source_remove(self.source_id)
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self.source_id = None
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