| # |
| # 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 usage of labels with different branches. |
| """ |
| from __future__ import annotations |
| |
| import pendulum |
| |
| from airflow import DAG |
| from airflow.operators.empty import EmptyOperator |
| from airflow.utils.edgemodifier import Label |
| |
| with DAG( |
| "example_branch_labels", |
| schedule="@daily", |
| start_date=pendulum.datetime(2021, 1, 1, tz="UTC"), |
| catchup=False, |
| ) as dag: |
| ingest = EmptyOperator(task_id="ingest") |
| analyse = EmptyOperator(task_id="analyze") |
| check = EmptyOperator(task_id="check_integrity") |
| describe = EmptyOperator(task_id="describe_integrity") |
| error = EmptyOperator(task_id="email_error") |
| save = EmptyOperator(task_id="save") |
| report = EmptyOperator(task_id="report") |
| |
| ingest >> analyse >> check |
| check >> Label("No errors") >> save >> report |
| check >> Label("Errors found") >> describe >> error >> report |