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				|  |  | +# Copyright 2016, Google Inc.
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				|  |  | +# All rights reserved.
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				|  |  | +#
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				|  |  | +# Redistribution and use in source and binary forms, with or without
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				|  |  | +# modification, are permitted provided that the following conditions are
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				|  |  | +# met:
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				|  |  | +#
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				|  |  | +#     * Redistributions of source code must retain the above copyright
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				|  |  | +# notice, this list of conditions and the following disclaimer.
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				|  |  | +#     * Redistributions in binary form must reproduce the above
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				|  |  | +# copyright notice, this list of conditions and the following disclaimer
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				|  |  | +# in the documentation and/or other materials provided with the
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				|  |  | +# distribution.
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				|  |  | +#     * Neither the name of Google Inc. nor the names of its
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				|  |  | +# contributors may be used to endorse or promote products derived from
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				|  |  | +# this software without specific prior written permission.
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				|  |  | +#
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				|  |  | +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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				|  |  | +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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				|  |  | +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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				|  |  | +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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				|  |  | +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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				|  |  | +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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				|  |  | +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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				|  |  | +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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				|  |  | +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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				|  |  | +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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				|  |  | +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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				|  |  | +
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				|  |  | +import threading
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				|  |  | +from concurrent import futures
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				|  |  | +
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				|  |  | +
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				|  |  | +class RecordingThreadPool(futures.Executor):
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				|  |  | +  """A thread pool that records if used."""
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				|  |  | +  def __init__(self, max_workers):
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				|  |  | +    self._tp_executor = futures.ThreadPoolExecutor(max_workers=max_workers)
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				|  |  | +    self._lock = threading.Lock()
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				|  |  | +    self._was_used = False
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				|  |  | +
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				|  |  | +  def submit(self, fn, *args, **kwargs):
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				|  |  | +    with self._lock:
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				|  |  | +      self._was_used = True
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				|  |  | +    self._tp_executor.submit(fn, *args, **kwargs)
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				|  |  | +
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				|  |  | +  def was_used(self):
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				|  |  | +    with self._lock:
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				|  |  | +      return self._was_used
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