| # |
| # 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 |
| """ |
| |
| # [START example] |
| import datetime as dt |
| |
| from airflow import DAG |
| from airflow.operators.dummy import DummyOperator |
| from airflow.operators.latest_only import LatestOnlyOperator |
| from airflow.utils.dates import days_ago |
| from airflow.utils.trigger_rule import TriggerRule |
| |
| dag = DAG( |
| dag_id='latest_only_with_trigger', |
| schedule_interval=dt.timedelta(hours=4), |
| start_date=days_ago(2), |
| tags=['example3'], |
| ) |
| |
| latest_only = LatestOnlyOperator(task_id='latest_only', dag=dag) |
| task1 = DummyOperator(task_id='task1', dag=dag) |
| task2 = DummyOperator(task_id='task2', dag=dag) |
| task3 = DummyOperator(task_id='task3', dag=dag) |
| task4 = DummyOperator(task_id='task4', dag=dag, trigger_rule=TriggerRule.ALL_DONE) |
| |
| latest_only >> task1 >> [task3, task4] |
| task2 >> [task3, task4] |
| # [END example] |