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# Copyright 2020 The TensorFlow Authors. All Rights Reserved.
#
# 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.
# ==============================================================================
"""Abstraction for data ingestion logic."""
import abc
class DataIngester(metaclass=abc.ABCMeta):
"""Link between a data source and a data provider.
A data ingester starts a reload operation in the background and
provides a data provider as a view.
"""
@property
@abc.abstractmethod
def data_provider(self):
"""Returns a `DataProvider`.
It may be an error to dereference this before `start` is called.
"""
pass
@abc.abstractmethod
def start(self):
"""Starts ingesting data.
This may start a background thread or process, and will return
once communication with that task is established. It won't block
forever as data is reloaded.
Must only be called once.
"""
pass
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