airflow mixins 源码
airflow mixins 代码
文件路径：/airflow/utils/mixins.py
#
# Licensed to the Apache Software Foundation (ASF) under one
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# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
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# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
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from __future__ import annotations
import multiprocessing
import typing
from airflow.configuration import conf
from airflow.utils.context import Context
class MultiprocessingStartMethodMixin:
"""Convenience class to add support for different types of multiprocessing."""
def _get_multiprocessing_start_method(self) -> str:
"""
Determine method of creating new processes by checking if the
mp_start_method is set in configs, else, it uses the OS default.
"""
if conf.has_option('core', 'mp_start_method'):
return conf.get_mandatory_value('core', 'mp_start_method')
method = multiprocessing.get_start_method()
if not method:
raise ValueError("Failed to determine start method")
return method
class ResolveMixin:
"""A runtime-resolved value."""
def resolve(self, context: Context) -> typing.Any:
raise NotImplementedError
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