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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."""
from grpc.framework.core import _interfaces
from grpc.framework.core import _utilities
from grpc.framework.interfaces.base import base
class EmissionManager(_interfaces.EmissionManager):
"""An EmissionManager implementation."""
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
self._ingestion_manager = None
self._initial_metadata_seen = False
self._payload_seen = False
self._completion_seen = False
def set_ingestion_manager(self, ingestion_manager):
"""Sets the ingestion manager with which this manager will cooperate.
Args:
ingestion_manager: The _interfaces.IngestionManager for the operation.
"""
self._ingestion_manager = ingestion_manager
def advance(
self, initial_metadata=None, payload=None, completion=None,
allowance=None):
initial_metadata_present = initial_metadata is not None
payload_present = payload is not None
completion_present = completion is not None
allowance_present = allowance is not None
with self._lock:
if self._termination_manager.outcome is None:
if (initial_metadata_present and (
self._initial_metadata_seen or self._payload_seen or
self._completion_seen) or
payload_present and self._completion_seen or
completion_present and self._completion_seen or
allowance_present and allowance <= 0):
outcome = _utilities.Outcome(
base.Outcome.Kind.LOCAL_FAILURE, None, None)
self._termination_manager.abort(outcome)
self._transmission_manager.abort(outcome)
self._expiration_manager.terminate()
else:
self._initial_metadata_seen |= initial_metadata_present
self._payload_seen |= payload_present
self._completion_seen |= completion_present
if completion_present:
self._termination_manager.emission_complete()
self._ingestion_manager.local_emissions_done()
self._transmission_manager.advance(
initial_metadata, payload, completion, allowance)
if allowance_present:
self._ingestion_manager.add_local_allowance(allowance)
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