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"""Sends lineage metadata to a backend"""
from typing import TYPE_CHECKING, Optional

if TYPE_CHECKING:
    from airflow.models.baseoperator import BaseOperator


class LineageBackend:
    """Sends lineage metadata to a backend"""

    def send_lineage(
        self,
        operator: 'BaseOperator',
        inlets: Optional[list] = None,
        outlets: Optional[list] = None,
        context: Optional[dict] = None,
    ):
        """
        Sends lineage metadata to a backend

        :param operator: the operator executing a transformation on the inlets and outlets
        :type operator: airflow.models.baseoperator.BaseOperator
        :param inlets: the inlets to this operator
        :type inlets: list
        :param outlets: the outlets from this operator
        :type outlets: list
        :param context: the current context of the task instance
        :type context: dict
        """
        raise NotImplementedError()