123 lines
3.4 KiB
Python
123 lines
3.4 KiB
Python
from threading import Lock, Timer
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from typing import MutableMapping, Optional, TypeVar
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from weakref import WeakKeyDictionary
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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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class TimeoutScheduler(PeriodicScheduler):
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"""A scheduler that schedules work via a timed callback."""
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_lock = Lock()
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_global: MutableMapping[type, "TimeoutScheduler"] = WeakKeyDictionary()
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@classmethod
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def singleton(cls) -> "TimeoutScheduler":
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with TimeoutScheduler._lock:
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try:
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self = TimeoutScheduler._global[cls]
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except KeyError:
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self = super().__new__(cls)
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TimeoutScheduler._global[cls] = self
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return self
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def __new__(cls) -> "TimeoutScheduler":
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return cls.singleton()
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def schedule(
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self, action: abc.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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def interval() -> None:
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sad.disposable = self.invoke_action(action, state)
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timer = Timer(0, interval)
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timer.daemon = True
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timer.start()
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def dispose() -> None:
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timer.cancel()
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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: abc.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)
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sad = SingleAssignmentDisposable()
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def interval() -> None:
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sad.disposable = self.invoke_action(action, state)
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timer = Timer(seconds, interval)
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timer.daemon = True
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timer.start()
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def dispose() -> None:
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timer.cancel()
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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: abc.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)
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__all__ = ["TimeoutScheduler"]
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