airflow example_branch_day_of_week_operator 源码
airflow example_branch_day_of_week_operator 代码
文件路径：/airflow/example_dags/example_branch_day_of_week_operator.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
#
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# 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
# under the License.
"""
Example DAG demonstrating the usage of BranchDayOfWeekOperator.
"""
from __future__ import annotations
import pendulum
from airflow import DAG
from airflow.operators.empty import EmptyOperator
from airflow.operators.weekday import BranchDayOfWeekOperator
from airflow.utils.weekday import WeekDay
with DAG(
dag_id="example_weekday_branch_operator",
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
tags=["example"],
schedule="@daily",
) as dag:
# [START howto_operator_day_of_week_branch]
empty_task_1 = EmptyOperator(task_id='branch_true')
empty_task_2 = EmptyOperator(task_id='branch_false')
empty_task_3 = EmptyOperator(task_id='branch_weekend')
empty_task_4 = EmptyOperator(task_id='branch_mid_week')
branch = BranchDayOfWeekOperator(
task_id="make_choice",
follow_task_ids_if_true="branch_true",
follow_task_ids_if_false="branch_false",
week_day="Monday",
)
branch_weekend = BranchDayOfWeekOperator(
task_id="make_weekend_choice",
follow_task_ids_if_true="branch_weekend",
follow_task_ids_if_false="branch_mid_week",
week_day={WeekDay.SATURDAY, WeekDay.SUNDAY},
)
# Run empty_task_1 if branch executes on Monday, empty_task_2 otherwise
branch >> [empty_task_1, empty_task_2]
# Run empty_task_3 if it's a weekend, empty_task_4 otherwise
empty_task_2 >> branch_weekend >> [empty_task_3, empty_task_4]
# [END howto_operator_day_of_week_branch]
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