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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 for demonstrating the usage of event driven scheduling using assets and triggers. | ||
""" | ||
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from __future__ import annotations | ||
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import os | ||
import tempfile | ||
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from airflow.decorators import task | ||
from airflow.models.baseoperator import chain | ||
from airflow.models.dag import DAG | ||
from airflow.providers.standard.triggers.file import FileTrigger | ||
from airflow.sdk.definitions.asset import Asset | ||
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file_path = tempfile.NamedTemporaryFile().name | ||
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with DAG( | ||
dag_id="example_create_file", | ||
catchup=False, | ||
): | ||
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@task | ||
def create_file(): | ||
with open(file_path, "w") as file: | ||
file.write("This is an example file.\n") | ||
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chain(create_file()) | ||
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trigger = FileTrigger(filepath=file_path, poke_interval=10) | ||
asset = Asset("example_asset", watchers=[trigger]) | ||
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with DAG( | ||
dag_id="example_asset_with_watchers", | ||
schedule=[asset], | ||
catchup=False, | ||
): | ||
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@task | ||
def delete_file(): | ||
if os.path.exists(file_path): | ||
os.remove(file_path) # Delete the file | ||
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chain(delete_file()) |
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