| # |
| # 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 DummyOperator and a custom DummySkipOperator which skips by default.""" |
| |
| from airflow import DAG |
| from airflow.exceptions import AirflowSkipException |
| from airflow.operators.dummy import DummyOperator |
| from airflow.utils.dates import days_ago |
| |
| args = { |
| 'owner': 'airflow', |
| } |
| |
| |
| # Create some placeholder operators |
| class DummySkipOperator(DummyOperator): |
| """Dummy operator which always skips the task.""" |
| |
| ui_color = '#e8b7e4' |
| |
| def execute(self, context): |
| raise AirflowSkipException |
| |
| |
| def create_test_pipeline(suffix, trigger_rule, dag_): |
| """ |
| 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 = DummySkipOperator(task_id=f'skip_operator_{suffix}', dag=dag_) |
| always_true = DummyOperator(task_id=f'always_true_{suffix}', dag=dag_) |
| join = DummyOperator(task_id=trigger_rule, dag=dag_, trigger_rule=trigger_rule) |
| final = DummyOperator(task_id=f'final_{suffix}', dag=dag_) |
| |
| skip_operator >> join |
| always_true >> join |
| join >> final |
| |
| |
| dag = DAG(dag_id='example_skip_dag', default_args=args, start_date=days_ago(2), tags=['example']) |
| create_test_pipeline('1', 'all_success', dag) |
| create_test_pipeline('2', 'one_success', dag) |