17bf3db06a
Remove line containing comment - # vim: tabstop=4 shiftwidth=4 softtabstop=4 Change-Id: I7581cc88b8de433d5609ed06c6570b0b45c13573 Closes-Bug:#1229324
89 lines
2.5 KiB
Python
89 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2013 Yahoo! Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import threading
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from concurrent import futures
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from taskflow.utils import eventlet_utils as eu
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DONE_STATES = frozenset([
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futures._base.CANCELLED_AND_NOTIFIED,
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futures._base.FINISHED,
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])
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class _Waiter(object):
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"""Provides the event that wait_for_any() blocks on."""
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def __init__(self, is_green):
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if is_green:
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assert eu.EVENTLET_AVAILABLE, ('eventlet is needed to use this'
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' feature')
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self.event = eu.green_threading.Event()
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else:
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self.event = threading.Event()
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def add_result(self, future):
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self.event.set()
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def add_exception(self, future):
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self.event.set()
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def add_cancelled(self, future):
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self.event.set()
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def _partition_futures(fs):
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"""Partitions the input futures into done and not done lists."""
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done = []
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not_done = []
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for f in fs:
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if f._state in DONE_STATES:
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done.append(f)
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else:
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not_done.append(f)
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return (done, not_done)
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def wait_for_any(fs, timeout=None):
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"""Wait for one of the futures to complete.
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Works correctly with both green and non-green futures.
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Returns pair (done, not_done).
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"""
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with futures._base._AcquireFutures(fs):
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(done, not_done) = _partition_futures(fs)
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if done:
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return (done, not_done)
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is_green = any(isinstance(f, eu.GreenFuture) for f in fs)
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waiter = _Waiter(is_green)
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for f in fs:
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f._waiters.append(waiter)
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waiter.event.wait(timeout)
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for f in fs:
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f._waiters.remove(waiter)
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with futures._base._AcquireFutures(fs):
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return _partition_futures(fs)
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def make_completed_future(result):
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"""Make with completed with given result."""
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future = futures.Future()
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future.set_result(result)
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return future
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