| # |
| # 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 DAG demonstrating the EmptyOperator and a custom EmptySkipOperator which skips by default.""" |
| from __future__ import annotations |
| |
| import pendulum |
| |
| from airflow import DAG |
| from airflow.exceptions import AirflowSkipException |
| from airflow.models.baseoperator import BaseOperator |
| from airflow.operators.empty import EmptyOperator |
| from airflow.utils.context import Context |
| from airflow.utils.trigger_rule import TriggerRule |
| |
| |
| # Create some placeholder operators |
| class EmptySkipOperator(BaseOperator): |
| """Empty operator which always skips the task.""" |
| |
| ui_color = "#e8b7e4" |
| |
| def execute(self, context: Context): |
| raise AirflowSkipException |
| |
| |
| def create_test_pipeline(suffix, trigger_rule): |
| """ |
| Instantiate a number of operators for the given DAG. |
| |
| :param str suffix: Suffix to append to the operator task_ids |
| :param str trigger_rule: TriggerRule for the join task |
| :param DAG dag_: The DAG to run the operators on |
| """ |
| skip_operator = EmptySkipOperator(task_id=f"skip_operator_{suffix}") |
| always_true = EmptyOperator(task_id=f"always_true_{suffix}") |
| join = EmptyOperator(task_id=trigger_rule, trigger_rule=trigger_rule) |
| final = EmptyOperator(task_id=f"final_{suffix}") |
| |
| skip_operator >> join |
| always_true >> join |
| join >> final |
| |
| |
| with DAG( |
| dag_id="example_skip_dag", |
| start_date=pendulum.datetime(2021, 1, 1, tz="UTC"), |
| catchup=False, |
| tags=["example"], |
| ) as dag: |
| create_test_pipeline("1", TriggerRule.ALL_SUCCESS) |
| create_test_pipeline("2", TriggerRule.ONE_SUCCESS) |