8345938584
* examples/gtkcrc.py: * morituri/common/crc.py: * morituri/common/task.py: Split out generic task/runner from CRC tasks.
124 lines
3.2 KiB
Python
124 lines
3.2 KiB
Python
# -*- Mode: Python; test-case-name: morituri.test.test_common_task -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# Morituri - for those about to RIP
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# Copyright (C) 2009 Thomas Vander Stichele
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# This file is part of morituri.
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#
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# morituri 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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# morituri 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 morituri. If not, see <http://www.gnu.org/licenses/>.
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import sys
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import gobject
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class Task(object):
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"""
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I wrap a task in an asynchronous interface.
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I can be listened to for starting, stopping, and progress updates.
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@ivar description: what am I doing
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"""
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description = 'I am doing something.'
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progress = 0.0
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increment = 0.01
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running = False
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_listeners = None
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def debug(self, *args, **kwargs):
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return
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print args, kwargs
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sys.stdout.flush()
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def start(self):
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self.running = True
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self._notifyListeners('started')
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def stop(self):
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self.debug('stopping')
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self.running = False
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self._notifyListeners('stopped')
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def setProgress(self, value):
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if value - self.progress > self.increment or value >= 1.0:
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self.progress = value
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self._notifyListeners('progressed', value)
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self.debug('notifying progress', value)
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def addListener(self, listener):
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if not self._listeners:
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self._listeners = []
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self._listeners.append(listener)
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def _notifyListeners(self, methodName, *args, **kwargs):
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if self._listeners:
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for l in self._listeners:
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getattr(l, methodName)(*args, **kwargs)
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class TaskRunner:
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"""
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I am a base class for task runners.
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Task runners should be reusable.
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"""
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def run(self, task):
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"""
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Run the given task.
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@type task: Task
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"""
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raise NotImplementedError
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# listener callbacks
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def progressed(self, value):
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"""
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Implement me to be informed about progress.
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@type value: float
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@param value: progress, from 0.0 to 1.0
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"""
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def started(self):
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"""
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Implement me to be informed about the task starting.
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"""
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def stopped(self):
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"""
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Implement me to be informed about the task starting.
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"""
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class SyncRunner(TaskRunner):
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def run(self, task):
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self._task = task
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self._loop = gobject.MainLoop()
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self._task.addListener(self)
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self._task.start()
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self._loop.run()
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def progressed(self, value):
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sys.stdout.write('%s %3d %%\r' % (
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self._task.description, value * 100.0))
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sys.stdout.flush()
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if value >= 1.0:
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sys.stdout.write('%s %3d %%\n' % (
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self._task.description, 100.0))
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def stopped(self):
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self._loop.quit()
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