Source code for airflow.operators.branch

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"""Branching operators"""

from typing import Dict, Iterable, Union

from airflow.models import BaseOperator
from airflow.models.skipmixin import SkipMixin

[docs]class BaseBranchOperator(BaseOperator, SkipMixin): """ This is a base class for creating operators with branching functionality, similarly to BranchPythonOperator. Users should subclass this operator and implement the function `choose_branch(self, context)`. This should run whatever business logic is needed to determine the branch, and return either the task_id for a single task (as a str) or a list of task_ids. The operator will continue with the returned task_id(s), and all other tasks directly downstream of this operator will be skipped. """
[docs] def choose_branch(self, context: Dict) -> Union[str, Iterable[str]]: """ Subclasses should implement this, running whatever logic is necessary to choose a branch and returning a task_id or list of task_ids. :param context: Context dictionary as passed to execute() :type context: dict """ raise NotImplementedError
[docs] def execute(self, context: Dict): branches_to_execute = self.choose_branch(context) self.skip_all_except(context['ti'], branches_to_execute) return branches_to_execute

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