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85 lines
3.1 KiB
Python
85 lines
3.1 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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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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from apscheduler.triggers.cron import CronTrigger
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from apscheduler.triggers.date import DateTrigger
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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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return cls._instance
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def schedule(self, func, trigger, name=None):
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if use_APScheduler:
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return self.scheduler.add_job(func=func, trigger=trigger, name=name)
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# Expects a lambda expression for the task
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def schedule_task(self, task, user=None, name=None, hidden=False, trigger=None):
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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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worker_task.scheduled = True
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WorkerThread.add(user, worker_task, hidden=hidden)
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return self.schedule(func=scheduled_task, trigger=trigger, name=name)
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# Expects a list of lambda expressions for the tasks
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def schedule_tasks(self, tasks, user=None, trigger=None):
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if use_APScheduler:
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for task in tasks:
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self.schedule_task(task[0], user=user, trigger=trigger, name=task[1], hidden=task[2])
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# Expects a lambda expression for the task
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def schedule_task_immediately(self, task, user=None, name=None, hidden=False):
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if use_APScheduler:
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def immediate_task():
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WorkerThread.add(user, task(), hidden)
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return self.schedule(func=immediate_task, trigger=DateTrigger(), name=name)
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# Expects a list of lambda expressions for the tasks
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def schedule_tasks_immediately(self, tasks, user=None):
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if use_APScheduler:
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for task in tasks:
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self.schedule_task_immediately(task[0], user, name="immediately " + task[1], hidden=task[2])
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# Remove all jobs
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def remove_all_jobs(self):
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self.scheduler.remove_all_jobs()
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