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diff --git a/src/python/grpcio/grpc/framework/base/_cancellation.py b/src/python/grpcio/grpc/framework/base/_cancellation.py
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@@ -1,64 +0,0 @@
-# Copyright 2015, Google Inc.
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-# * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-# * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-# * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-"""State and behavior for operation cancellation."""
-
-from grpc.framework.base import _interfaces
-from grpc.framework.base import interfaces
-
-
-class CancellationManager(_interfaces.CancellationManager):
- """An implementation of _interfaces.CancellationManager."""
-
- def __init__(
- self, lock, termination_manager, transmission_manager, ingestion_manager,
- expiration_manager):
- """Constructor.
-
- Args:
- lock: The operation-wide lock.
- termination_manager: The _interfaces.TerminationManager for the operation.
- transmission_manager: The _interfaces.TransmissionManager for the
- operation.
- ingestion_manager: The _interfaces.IngestionManager for the operation.
- expiration_manager: The _interfaces.ExpirationManager for the operation.
- """
- self._lock = lock
- self._termination_manager = termination_manager
- self._transmission_manager = transmission_manager
- self._ingestion_manager = ingestion_manager
- self._expiration_manager = expiration_manager
-
- def cancel(self):
- """See _interfaces.CancellationManager.cancel for specification."""
- with self._lock:
- self._termination_manager.abort(interfaces.Outcome.CANCELLED)
- self._transmission_manager.abort(interfaces.Outcome.CANCELLED)
- self._ingestion_manager.abort()
- self._expiration_manager.abort()