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r"""
After tutorial.py file submit to Apache DolphinScheduler server a DAG would be create,
and workflow DAG graph as below:

                  --> task_child_one
                /                    \
task_parent -->                        -->  task_union
                \                   /
                  --> task_child_two
"""

from pydolphinscheduler.core.process_definition import ProcessDefinition
from pydolphinscheduler.tasks.shell import Shell

with ProcessDefinition(name="tutorial", tenant="tenant_exists") as pd:
    task_parent = Shell(name="task_parent", command="echo hello pydolphinscheduler")
    task_child_one = Shell(name="task_child_one", command="echo 'child one'")
    task_child_two = Shell(name="task_child_two", command="echo 'child two'")
    task_union = Shell(name="task_union", command="echo union")

    task_group = [task_child_one, task_child_two]
    task_parent.set_downstream(task_group)

    task_union << task_group

    pd.run()