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from collections import deque
from threading import Condition, Lock
from typing import Deque
from reactivex.internal.priorityqueue import PriorityQueue
from .scheduleditem import ScheduledItem
class Trampoline:
def __init__(self) -> None:
self._idle: bool = True
self._queue: PriorityQueue[ScheduledItem] = PriorityQueue()
self._lock: Lock = Lock()
self._condition: Condition = Condition(self._lock)
def idle(self) -> bool:
with self._lock:
return self._idle
def run(self, item: ScheduledItem) -> None:
with self._lock:
self._queue.enqueue(item)
if self._idle:
self._idle = False
else:
self._condition.notify()
return
try:
self._run()
finally:
with self._lock:
self._idle = True
self._queue.clear()
def _run(self) -> None:
ready: Deque[ScheduledItem] = deque()
while True:
with self._lock:
while len(self._queue) > 0:
item: ScheduledItem = self._queue.peek()
if item.duetime <= item.scheduler.now:
self._queue.dequeue()
ready.append(item)
else:
break
while len(ready) > 0:
item = ready.popleft()
if not item.is_cancelled():
item.invoke()
with self._lock:
if len(self._queue) == 0:
break
item = self._queue.peek()
seconds = (item.duetime - item.scheduler.now).total_seconds()
if seconds > 0.0:
self._condition.wait(seconds)
__all__ = ["Trampoline"]
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