50 lines
1.2 KiB
Python
50 lines
1.2 KiB
Python
from __future__ import annotations
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import asyncio
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from asyncio import Event
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from collections import deque
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from typing import Generic, TypeVar
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QueueType = TypeVar("QueueType")
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class Queue(Generic[QueueType]):
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"""A cut-down version of asyncio.Queue
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This has just enough functionality to run the message pumps.
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"""
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def __init__(self) -> None:
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self.values: deque[QueueType] = deque()
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self.ready_event = Event()
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def put_nowait(self, value: QueueType) -> None:
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self.values.append(value)
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self.ready_event.set()
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def qsize(self) -> int:
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return len(self.values)
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def empty(self) -> bool:
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return not self.values
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def task_done(self) -> None:
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pass
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async def get(self) -> QueueType:
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if not self.ready_event.is_set():
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await self.ready_event.wait()
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value = self.values.popleft()
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if not self.values:
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self.ready_event.clear()
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return value
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def get_nowait(self) -> QueueType:
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if not self.values:
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raise asyncio.QueueEmpty()
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value = self.values.popleft()
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if not self.values:
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self.ready_event.clear()
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return value
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