mirror of
https://github.com/janeczku/calibre-web
synced 2024-11-08 07:10:39 +00:00
71 lines
2.5 KiB
Python
71 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
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# This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
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# Copyright (C) 2020 mmonkey
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#
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# This program 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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# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import division, print_function, unicode_literals
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import atexit
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from .. import logger
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from .worker import WorkerThread
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try:
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from apscheduler.schedulers.background import BackgroundScheduler as BScheduler
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use_APScheduler = True
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except (ImportError, RuntimeError) as e:
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use_APScheduler = False
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log = logger.create()
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log.info('APScheduler not found. Unable to schedule tasks.')
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class BackgroundScheduler:
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_instance = None
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def __new__(cls):
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if not use_APScheduler:
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return False
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if cls._instance is None:
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cls._instance = super(BackgroundScheduler, cls).__new__(cls)
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cls.log = logger.create()
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cls.scheduler = BScheduler()
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cls.scheduler.start()
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atexit.register(lambda: cls.scheduler.shutdown())
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return cls._instance
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def _add(self, func, trigger, **trigger_args):
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if use_APScheduler:
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return self.scheduler.add_job(func=func, trigger=trigger, **trigger_args)
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# Expects a lambda expression for the task, so that the task isn't instantiated before the task is scheduled
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def schedule_task(self, user, task, trigger, **trigger_args):
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if use_APScheduler:
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def scheduled_task():
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worker_task = task()
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WorkerThread.add(user, worker_task)
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return self._add(func=scheduled_task, trigger=trigger, **trigger_args)
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# Expects a lambda expression for the task, so that the task isn't instantiated before the task is scheduled
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def schedule_task_immediately(self, user, task):
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if use_APScheduler:
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def scheduled_task():
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WorkerThread.add(user, task())
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return self._add(func=scheduled_task, trigger='date')
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