32 lines
1.1 KiB
Python
32 lines
1.1 KiB
Python
# Copyright 2017 AT&T Intellectual Property. All other rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from airflow.models import DAG
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from airflow.operators import ConcurrencyCheckOperator
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def dag_concurrency_check(parent_dag_name, child_dag_name, args):
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'''
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dag_concurrency_check is a sub-DAG that will will allow for a DAG to
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determine if it is already running, and result in an error if so.
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'''
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dag = DAG(
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'{}.{}'.format(parent_dag_name, child_dag_name),
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default_args=args, )
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dag_concurrency_check_operator = ConcurrencyCheckOperator(
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task_id='dag_concurrency_check', dag=dag)
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return dag
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