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152
myenv/lib/python3.12/site-packages/reactivex/abc/scheduler.py
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152
myenv/lib/python3.12/site-packages/reactivex/abc/scheduler.py
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from abc import ABC, abstractmethod
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from datetime import datetime, timedelta
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from typing import Callable, Optional, TypeVar, Union
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from .disposable import DisposableBase
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_TState = TypeVar("_TState") # Can be anything
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AbsoluteTime = Union[datetime, float]
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RelativeTime = Union[timedelta, float]
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AbsoluteOrRelativeTime = Union[datetime, timedelta, float]
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ScheduledAction = Callable[
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["SchedulerBase", Optional[_TState]],
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Optional[DisposableBase],
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]
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class SchedulerBase(ABC):
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"""Scheduler abstract base class."""
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__slots__ = ()
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@property
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@abstractmethod
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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 NotImplemented
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@abstractmethod
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def schedule(
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self, action: ScheduledAction[_TState], state: Optional[_TState] = None
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) -> 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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return NotImplemented
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@abstractmethod
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def schedule_relative(
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self,
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duetime: RelativeTime,
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action: ScheduledAction[_TState],
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state: Optional[_TState] = None,
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) -> 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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return NotImplemented
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@abstractmethod
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def schedule_absolute(
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self,
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duetime: AbsoluteTime,
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action: ScheduledAction[_TState],
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state: Optional[_TState] = None,
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) -> 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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return NotImplemented
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@classmethod
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@abstractmethod
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def to_seconds(cls, value: AbsoluteOrRelativeTime) -> float:
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"""Converts time value to seconds. This method handles both absolute
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(datetime) and relative (timedelta) values. If the argument is already
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a float, it is simply returned unchanged.
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Args:
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value: the time value to convert to seconds.
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Returns:
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The value converted to seconds.
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"""
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return NotImplemented
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@classmethod
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@abstractmethod
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def to_datetime(cls, value: AbsoluteOrRelativeTime) -> datetime:
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"""Converts time value to datetime. This method handles both absolute
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(float) and relative (timedelta) values. If the argument is already
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a datetime, it is simply returned unchanged.
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Args:
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value: the time value to convert to datetime.
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Returns:
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The value converted to datetime.
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"""
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return NotImplemented
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@classmethod
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@abstractmethod
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def to_timedelta(cls, value: AbsoluteOrRelativeTime) -> timedelta:
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"""Converts time value to timedelta. This method handles both absolute
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(datetime) and relative (float) values. If the argument is already
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a timedelta, it is simply returned unchanged. If the argument is an
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absolute time, the result value will be the timedelta since the epoch,
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January 1st, 1970, 00:00:00.
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Args:
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value: the time value to convert to timedelta.
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Returns:
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The value converted to timedelta.
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"""
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return NotImplemented
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__all__ = [
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"SchedulerBase",
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"AbsoluteTime",
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"RelativeTime",
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"AbsoluteOrRelativeTime",
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"ScheduledAction",
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]
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