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