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75 lines
2.2 KiB
75 lines
2.2 KiB
from __future__ import absolute_import
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from functools import wraps, partial
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from apscheduler.schedulers.base import BaseScheduler
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from apscheduler.util import maybe_ref
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try:
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import asyncio
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except ImportError: # pragma: nocover
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try:
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import trollius as asyncio
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except ImportError:
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raise ImportError(
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'AsyncIOScheduler requires either Python 3.4 or the asyncio package installed')
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def run_in_event_loop(func):
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@wraps(func)
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def wrapper(self, *args, **kwargs):
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wrapped = partial(func, self, *args, **kwargs)
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self._eventloop.call_soon_threadsafe(wrapped)
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return wrapper
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class AsyncIOScheduler(BaseScheduler):
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"""
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A scheduler that runs on an asyncio (:pep:`3156`) event loop.
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The default executor can run jobs based on native coroutines (``async def``).
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Extra options:
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============== =============================================================
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``event_loop`` AsyncIO event loop to use (defaults to the global event loop)
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============== =============================================================
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"""
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_eventloop = None
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_timeout = None
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def start(self, paused=False):
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if not self._eventloop:
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self._eventloop = asyncio.get_event_loop()
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super(AsyncIOScheduler, self).start(paused)
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@run_in_event_loop
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def shutdown(self, wait=True):
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super(AsyncIOScheduler, self).shutdown(wait)
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self._stop_timer()
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def _configure(self, config):
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self._eventloop = maybe_ref(config.pop('event_loop', None))
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super(AsyncIOScheduler, self)._configure(config)
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def _start_timer(self, wait_seconds):
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self._stop_timer()
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if wait_seconds is not None:
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self._timeout = self._eventloop.call_later(wait_seconds, self.wakeup)
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def _stop_timer(self):
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if self._timeout:
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self._timeout.cancel()
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del self._timeout
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@run_in_event_loop
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def wakeup(self):
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self._stop_timer()
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wait_seconds = self._process_jobs()
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self._start_timer(wait_seconds)
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def _create_default_executor(self):
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from apscheduler.executors.asyncio import AsyncIOExecutor
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return AsyncIOExecutor()
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