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from __future__ import annotations

# [START howto_trigger_message_queue]
from airflow.providers.common.messaging.triggers.msg_queue import MessageQueueTrigger
from airflow.providers.standard.operators.empty import EmptyOperator
from airflow.sdk import DAG, Asset, AssetWatcher

# Define a trigger that listens to an external message queue (Redis in this case)
trigger = MessageQueueTrigger(scheme="redis+pubsub", channels=["test"])

# Define an asset that watches for messages on the queue
asset = Asset("redis_queue_asset_1", watchers=[AssetWatcher(name="redis_watcher_1", trigger=trigger)])

with DAG(dag_id="example_redis_watcher_1", schedule=[asset]) as dag:
    EmptyOperator(task_id="task_1")
# [END howto_trigger_message_queue]


from tests_common.test_utils.system_tests import get_test_run  # noqa: E402

# Needed to run the example DAG with pytest (see: contributing-docs/testing/system_tests.rst)
test_run = get_test_run(dag)
