114 lines
3.4 KiB
Python
114 lines
3.4 KiB
Python
import logging
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import threading
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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.internal import PriorityQueue
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from reactivex.internal.constants import DELTA_ZERO
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from ..periodicscheduler import PeriodicScheduler
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from ..scheduleditem import ScheduledItem
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_TState = TypeVar("_TState")
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log = logging.getLogger("Rx")
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class PyGameScheduler(PeriodicScheduler):
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"""A scheduler that schedules works for PyGame.
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Note that this class expects the caller to invoke run() repeatedly.
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http://www.pygame.org/docs/ref/time.html
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http://www.pygame.org/docs/ref/event.html"""
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def __init__(self, pygame: Any):
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"""Create a new PyGameScheduler.
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Args:
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pygame: The PyGame module to use; typically, you would get this by
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import pygame
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"""
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super().__init__()
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self._pygame = pygame # TODO not used, refactor to actually use pygame?
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self._lock = threading.Lock()
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self._queue: PriorityQueue[ScheduledItem] = PriorityQueue()
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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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log.debug("PyGameScheduler.schedule(state=%s)", state)
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return self.schedule_absolute(self.now, action, state=state)
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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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duetime = max(DELTA_ZERO, self.to_timedelta(duetime))
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return self.schedule_absolute(self.now + duetime, action, state=state)
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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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si: ScheduledItem = ScheduledItem(self, state, action, duetime)
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with self._lock:
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self._queue.enqueue(si)
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return si.disposable
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def run(self) -> None:
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while self._queue:
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with self._lock:
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item: ScheduledItem = self._queue.peek()
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diff = item.duetime - self.now
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if diff > DELTA_ZERO:
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break
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item = self._queue.dequeue()
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if not item.is_cancelled():
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item.invoke()
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