# Copyright 2022-2023 ETSI TeraFlowSDN - TFS OSG (https://tfs.etsi.org/)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from typing import Iterator, Set, Tuple

class _Backend:
    def __init__(self, **settings) -> None:
        raise NotImplementedError()

    def terminate(self) -> None:
        raise NotImplementedError()

    def publish(self, topic_name : str, message_content : str) -> None:
        raise NotImplementedError()

    def consume(self, topic_names : Set[str], consume_timeout : float) -> Iterator[Tuple[str, str]]:
        raise NotImplementedError()