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import logging
import threading
from datetime import datetime
from typing import Optional, TypeVar
from reactivex import abc, typing
from reactivex.disposable import Disposable
from reactivex.internal.concurrency import default_thread_factory
from .eventloopscheduler import EventLoopScheduler
from .periodicscheduler import PeriodicScheduler
_TState = TypeVar("_TState")
log = logging.getLogger("Rx")
class NewThreadScheduler(PeriodicScheduler):
"""Creates an object that schedules each unit of work on a separate thread."""
def __init__(
self, thread_factory: Optional[typing.StartableFactory] = None
) -> None:
super().__init__()
self.thread_factory: typing.StartableFactory = (
thread_factory or default_thread_factory
)
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).
"""
scheduler = EventLoopScheduler(
thread_factory=self.thread_factory, exit_if_empty=True
)
return scheduler.schedule(action, state)
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).
"""
scheduler = EventLoopScheduler(
thread_factory=self.thread_factory, exit_if_empty=True
)
return scheduler.schedule_relative(duetime, action, state)
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).
"""
dt = self.to_datetime(duetime)
return self.schedule_relative(dt - self.now, action, state=state)
def schedule_periodic(
self,
period: typing.RelativeTime,
action: typing.ScheduledPeriodicAction[_TState],
state: Optional[_TState] = None,
) -> abc.DisposableBase:
"""Schedules a periodic piece of work.
Args:
period: Period in seconds or timedelta for running the
work periodically.
action: Action to be executed.
state: [Optional] Initial state passed to the action upon
the first iteration.
Returns:
The disposable object used to cancel the scheduled
recurring action (best effort).
"""
seconds: float = self.to_seconds(period)
timeout: float = seconds
disposed: threading.Event = threading.Event()
def run() -> None:
nonlocal state, timeout
while True:
if timeout > 0.0:
disposed.wait(timeout)
if disposed.is_set():
return
time: datetime = self.now
state = action(state)
timeout = seconds - (self.now - time).total_seconds()
thread = self.thread_factory(run)
thread.start()
def dispose() -> None:
disposed.set()
return Disposable(dispose)
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