Source code for airflow.example_dags.example_latest_only_with_trigger

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"""
Example LatestOnlyOperator and TriggerRule interactions
"""
from __future__ import annotations

# [START example]
import datetime

import pendulum

from airflow.models.dag import DAG
from airflow.operators.empty import EmptyOperator
from airflow.operators.latest_only import LatestOnlyOperator
from airflow.utils.trigger_rule import TriggerRule

with DAG(
    dag_id="latest_only_with_trigger",
    schedule=datetime.timedelta(hours=4),
    start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
    catchup=False,
    tags=["example3"],
) as dag:
[docs] latest_only = LatestOnlyOperator(task_id="latest_only")
task1 = EmptyOperator(task_id="task1") task2 = EmptyOperator(task_id="task2") task3 = EmptyOperator(task_id="task3") task4 = EmptyOperator(task_id="task4", trigger_rule=TriggerRule.ALL_DONE) latest_only >> task1 >> [task3, task4] task2 >> [task3, task4] # [END example]

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