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Beam IO for Google Cloud Pub/Sub Lite

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/*
 * Copyright 2021 Google LLC
 *
 * 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.
 */

package com.google.cloud.pubsublite.beam;

import java.io.Serializable;

/**
 * A ManagedBacklogReaderFactory produces TopicBacklogReaders and tears down any produced readers
 * when it is itself closed.
 *
 * close() should never be called on produced readers.
 */
public interface ManagedBacklogReaderFactory extends AutoCloseable, Serializable {
  TopicBacklogReader newReader(SubscriptionPartition subscriptionPartition);

  @Override
  void close();
}