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managed_event_loop.py
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managed_event_loop.py
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# Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from asyncio import AbstractEventLoop, new_event_loop, run_coroutine_threadsafe
from concurrent.futures import Future
from threading import Thread
from typing import ContextManager
class ManagedEventLoop(ContextManager):
_loop: AbstractEventLoop
_thread: Thread
def __init__(self):
self._loop = new_event_loop()
self._thread = Thread(target=lambda: self._loop.run_forever())
def __enter__(self):
self._thread.start()
def __exit__(self, exc_type, exc_value, traceback):
self._loop.call_soon_threadsafe(self._loop.stop)
self._thread.join()
def submit(self, coro) -> Future:
return run_coroutine_threadsafe(coro, self._loop)