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# 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 context."""
import time
# _interfaces is referenced from specification in this module.
from grpc.framework.core import _interfaces # pylint: disable=unused-import
from grpc.framework.interfaces.base import base
class OperationContext(base.OperationContext):
"""An implementation of interfaces.OperationContext."""
def __init__(
self, lock, termination_manager, transmission_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.
expiration_manager: The _interfaces.ExpirationManager for the operation.
"""
self._lock = lock
self._termination_manager = termination_manager
self._transmission_manager = transmission_manager
self._expiration_manager = expiration_manager
def _abort(self, outcome):
with self._lock:
if self._termination_manager.outcome is None:
self._termination_manager.abort(outcome)
self._transmission_manager.abort(outcome)
self._expiration_manager.terminate()
def outcome(self):
"""See base.OperationContext.outcome for specification."""
with self._lock:
return self._termination_manager.outcome
def add_termination_callback(self, callback):
"""See base.OperationContext.add_termination_callback."""
with self._lock:
if self._termination_manager.outcome is None:
self._termination_manager.add_callback(callback)
return None
else:
return self._termination_manager.outcome
def time_remaining(self):
"""See base.OperationContext.time_remaining for specification."""
with self._lock:
deadline = self._expiration_manager.deadline()
return max(0.0, deadline - time.time())
def cancel(self):
"""See base.OperationContext.cancel for specification."""
self._abort(base.Outcome.CANCELLED)
def fail(self, exception):
"""See base.OperationContext.fail for specification."""
self._abort(base.Outcome.LOCAL_FAILURE)
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