8de131502c
Instead of mixing eventlet related utility functionality with async utility functionality it seems to make sense to seperate those types into two different files. Change-Id: I8770fa5163feaa5f3666d36bf55d9aa30ca1b15f
74 lines
2.2 KiB
Python
74 lines
2.2 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright (C) 2013 Yahoo! Inc. All Rights Reserved.
|
|
#
|
|
# 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.
|
|
|
|
import threading
|
|
|
|
from concurrent import futures
|
|
|
|
from taskflow.utils import eventlet_utils as eu
|
|
|
|
|
|
class _Waiter(object):
|
|
"""Provides the event that wait_for_any() blocks on."""
|
|
def __init__(self, is_green):
|
|
if is_green:
|
|
assert eu.EVENTLET_AVAILABLE, ('eventlet is needed to use this'
|
|
' feature')
|
|
self.event = eu.green_threading.Event()
|
|
else:
|
|
self.event = threading.Event()
|
|
|
|
def add_result(self, future):
|
|
self.event.set()
|
|
|
|
def add_exception(self, future):
|
|
self.event.set()
|
|
|
|
def add_cancelled(self, future):
|
|
self.event.set()
|
|
|
|
|
|
def _done_futures(fs):
|
|
return set(f for f in fs
|
|
if f._state in [futures._base.CANCELLED_AND_NOTIFIED,
|
|
futures._base.FINISHED])
|
|
|
|
|
|
def wait_for_any(fs, timeout=None):
|
|
"""Wait for one of the futures to complete.
|
|
|
|
Works correctly with both green and non-green futures.
|
|
Returns pair (done, not_done).
|
|
"""
|
|
with futures._base._AcquireFutures(fs):
|
|
done = _done_futures(fs)
|
|
if done:
|
|
return done, set(fs) - done
|
|
is_green = any(isinstance(f, eu.GreenFuture) for f in fs)
|
|
waiter = _Waiter(is_green)
|
|
for f in fs:
|
|
f._waiters.append(waiter)
|
|
|
|
waiter.event.wait(timeout)
|
|
for f in fs:
|
|
f._waiters.remove(waiter)
|
|
|
|
with futures._base._AcquireFutures(fs):
|
|
done = _done_futures(fs)
|
|
return done, set(fs) - done
|