133 lines
3.8 KiB
Python
133 lines
3.8 KiB
Python
import logging
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from datetime import datetime
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from typing import Any, Optional, TypeVar
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from reactivex import abc, typing
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from reactivex.disposable import (
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CompositeDisposable,
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Disposable,
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SingleAssignmentDisposable,
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)
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from ..periodicscheduler import PeriodicScheduler
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_TState = TypeVar("_TState")
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log = logging.getLogger("Rx")
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class IOLoopScheduler(PeriodicScheduler):
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"""A scheduler that schedules work via the Tornado I/O main event loop.
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Note, as of Tornado 6, this is just a wrapper around the asyncio loop.
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http://tornado.readthedocs.org/en/latest/ioloop.html"""
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def __init__(self, loop: Any) -> None:
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"""Create a new IOLoopScheduler.
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Args:
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loop: The ioloop to use; typically, you would get this by
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tornado import ioloop; ioloop.IOLoop.current()
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"""
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super().__init__()
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self._loop = loop
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def schedule(
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self, action: typing.ScheduledAction[_TState], state: Optional[_TState] = None
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) -> abc.DisposableBase:
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"""Schedules an action to be executed.
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Args:
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action: Action to be executed.
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state: [Optional] state to be given to the action function.
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Returns:
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The disposable object used to cancel the scheduled action
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(best effort).
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"""
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sad = SingleAssignmentDisposable()
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disposed = False
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def interval() -> None:
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if not disposed:
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sad.disposable = self.invoke_action(action, state=state)
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self._loop.add_callback(interval)
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def dispose() -> None:
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nonlocal disposed
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disposed = True
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return CompositeDisposable(sad, Disposable(dispose))
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def schedule_relative(
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self,
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duetime: typing.RelativeTime,
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action: typing.ScheduledAction[_TState],
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state: Optional[_TState] = None,
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) -> abc.DisposableBase:
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"""Schedules an action to be executed after duetime.
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Args:
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duetime: Relative time after which to execute the action.
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action: Action to be executed.
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state: [Optional] state to be given to the action function.
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Returns:
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The disposable object used to cancel the scheduled action
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(best effort).
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"""
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seconds = self.to_seconds(duetime)
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if seconds <= 0.0:
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return self.schedule(action, state=state)
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sad = SingleAssignmentDisposable()
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def interval() -> None:
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sad.disposable = self.invoke_action(action, state=state)
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log.debug("timeout: %s", seconds)
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timer = self._loop.call_later(seconds, interval)
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def dispose() -> None:
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self._loop.remove_timeout(timer)
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self._loop.remove_timeout(timer)
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return CompositeDisposable(sad, Disposable(dispose))
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def schedule_absolute(
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self,
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duetime: typing.AbsoluteTime,
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action: typing.ScheduledAction[_TState],
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state: Optional[_TState] = None,
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) -> abc.DisposableBase:
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"""Schedules an action to be executed at duetime.
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Args:
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duetime: Absolute time at which to execute the action.
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action: Action to be executed.
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state: [Optional] state to be given to the action function.
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Returns:
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The disposable object used to cancel the scheduled action
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(best effort).
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"""
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duetime = self.to_datetime(duetime)
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return self.schedule_relative(duetime - self.now, action, state=state)
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@property
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def now(self) -> datetime:
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"""Represents a notion of time for this scheduler. Tasks being
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scheduled on a scheduler will adhere to the time denoted by this
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property.
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Returns:
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The scheduler's current time, as a datetime instance.
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"""
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return self.to_datetime(self._loop.time())
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