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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 handling emitted values."""
# packets is referenced from specifications in this module.
from _framework.base.packets import _interfaces
from _framework.base.packets import packets # pylint: disable=unused-import
class _EmissionManager(_interfaces.EmissionManager):
"""An implementation of _interfaces.EmissionManager."""
def __init__(
self, lock, failure_kind, termination_manager, transmission_manager):
"""Constructor.
Args:
lock: The operation-wide lock.
failure_kind: Whichever one of packets.Kind.SERVICED_FAILURE or
packets.Kind.SERVICER_FAILURE describes this object's methods being
called inappropriately by customer code.
termination_manager: The _interfaces.TerminationManager for the operation.
transmission_manager: The _interfaces.TransmissionManager for the
operation.
"""
self._lock = lock
self._failure_kind = failure_kind
self._termination_manager = termination_manager
self._transmission_manager = transmission_manager
self._ingestion_manager = None
self._expiration_manager = None
self._emission_complete = False
def set_ingestion_manager_and_expiration_manager(
self, ingestion_manager, expiration_manager):
self._ingestion_manager = ingestion_manager
self._expiration_manager = expiration_manager
def _abort(self):
self._termination_manager.abort(self._failure_kind)
self._transmission_manager.abort(self._failure_kind)
self._ingestion_manager.abort()
self._expiration_manager.abort()
def consume(self, value):
with self._lock:
if self._emission_complete:
self._abort()
else:
self._transmission_manager.inmit(value, False)
def terminate(self):
with self._lock:
if not self._emission_complete:
self._termination_manager.emission_complete()
self._transmission_manager.inmit(None, True)
self._emission_complete = True
def consume_and_terminate(self, value):
with self._lock:
if self._emission_complete:
self._abort()
else:
self._termination_manager.emission_complete()
self._transmission_manager.inmit(value, True)
self._emission_complete = True
def front_emission_manager(lock, termination_manager, transmission_manager):
"""Creates an _interfaces.EmissionManager appropriate for front-side use.
Args:
lock: The operation-wide lock.
termination_manager: The _interfaces.TerminationManager for the operation.
transmission_manager: The _interfaces.TransmissionManager for the operation.
Returns:
An _interfaces.EmissionManager appropriate for front-side use.
"""
return _EmissionManager(
lock, packets.Kind.SERVICED_FAILURE, termination_manager,
transmission_manager)
def back_emission_manager(lock, termination_manager, transmission_manager):
"""Creates an _interfaces.EmissionManager appropriate for back-side use.
Args:
lock: The operation-wide lock.
termination_manager: The _interfaces.TerminationManager for the operation.
transmission_manager: The _interfaces.TransmissionManager for the operation.
Returns:
An _interfaces.EmissionManager appropriate for back-side use.
"""
return _EmissionManager(
lock, packets.Kind.SERVICER_FAILURE, termination_manager,
transmission_manager)
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