| # |
| # 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. |
| """ |
| Example LatestOnlyOperator and TriggerRule interactions |
| """ |
| from __future__ import annotations |
| |
| # [START example] |
| import datetime |
| |
| import pendulum |
| |
| from airflow import DAG |
| from airflow.operators.empty import EmptyOperator |
| from airflow.operators.latest_only import LatestOnlyOperator |
| from airflow.utils.trigger_rule import TriggerRule |
| |
| with DAG( |
| dag_id="latest_only_with_trigger", |
| schedule=datetime.timedelta(hours=4), |
| start_date=pendulum.datetime(2021, 1, 1, tz="UTC"), |
| catchup=False, |
| tags=["example3"], |
| ) as dag: |
| latest_only = LatestOnlyOperator(task_id="latest_only") |
| task1 = EmptyOperator(task_id="task1") |
| task2 = EmptyOperator(task_id="task2") |
| task3 = EmptyOperator(task_id="task3") |
| task4 = EmptyOperator(task_id="task4", trigger_rule=TriggerRule.ALL_DONE) |
| |
| latest_only >> task1 >> [task3, task4] |
| task2 >> [task3, task4] |
| # [END example] |