airflow example_branch_operator_decorator 源码
airflow example_branch_operator_decorator 代码
文件路径：/airflow/example_dags/example_branch_operator_decorator.py
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"""Example DAG demonstrating the usage of the ``@task.branch`` TaskFlow API decorator."""
from __future__ import annotations
import random
import pendulum
from airflow import DAG
from airflow.decorators import task
from airflow.operators.empty import EmptyOperator
from airflow.utils.edgemodifier import Label
from airflow.utils.trigger_rule import TriggerRule
with DAG(
dag_id='example_branch_python_operator_decorator',
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
schedule="@daily",
tags=['example', 'example2'],
) as dag:
run_this_first = EmptyOperator(task_id='run_this_first')
options = ['branch_a', 'branch_b', 'branch_c', 'branch_d']
@task.branch(task_id="branching")
def random_choice(choices: list[str]) -> str:
return random.choice(choices)
random_choice_instance = random_choice(choices=options)
run_this_first >> random_choice_instance
join = EmptyOperator(task_id='join', trigger_rule=TriggerRule.NONE_FAILED_MIN_ONE_SUCCESS)
for option in options:
t = EmptyOperator(task_id=option)
empty_follow = EmptyOperator(task_id='follow_' + option)
# Label is optional here, but it can help identify more complex branches
random_choice_instance >> Label(option) >> t >> empty_follow >> join
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