airflow weight_rule 源码
airflow weight_rule 代码
文件路径：/airflow/utils/weight_rule.py
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# 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
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from __future__ import annotations
from enum import Enum
from airflow.compat.functools import cache
class WeightRule(str, Enum):
"""Weight rules."""
DOWNSTREAM = 'downstream'
UPSTREAM = 'upstream'
ABSOLUTE = 'absolute'
@classmethod
def is_valid(cls, weight_rule: str) -> bool:
"""Check if weight rule is valid."""
return weight_rule in cls.all_weight_rules()
@classmethod
@cache
def all_weight_rules(cls) -> set[str]:
"""Returns all weight rules"""
return set(cls.__members__.values())
def __str__(self) -> str:
return self.value
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