| # 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: |
| # |
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| # 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. |
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| # 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 |
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| |
| """State and behavior for handling emitted values.""" |
| |
| from grpc.framework.core import _interfaces |
| 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): |
| self._termination_manager.abort(base.Outcome.LOCAL_FAILURE) |
| self._transmission_manager.abort(base.Outcome.LOCAL_FAILURE) |
| 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) |