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example_skip_dag.py
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example_skip_dag.py
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#
# 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."""
import pendulum
from airflow import DAG
from airflow.exceptions import AirflowSkipException
from airflow.operators.dummy import DummyOperator
from airflow.utils.context import Context
from airflow.utils.trigger_rule import TriggerRule
# Create some placeholder operators
class DummySkipOperator(DummyOperator):
"""Dummy 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 = DummySkipOperator(task_id=f'skip_operator_{suffix}')
always_true = DummyOperator(task_id=f'always_true_{suffix}')
join = DummyOperator(task_id=trigger_rule, trigger_rule=trigger_rule)
final = DummyOperator(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)