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Beam IO for Google Cloud Pub/Sub Lite

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/*
 * Copyright 2020 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 com.google.auto.value.AutoValue;
import com.google.cloud.pubsublite.TopicPath;
import java.io.Serializable;
import org.checkerframework.checker.nullness.qual.Nullable;

/** Options needed for a Pub/Sub Lite Publisher. */
@AutoValue
public abstract class PublisherOptions implements Serializable {
  private static final long serialVersionUID = 275311613L;

  // Required parameters.
  public abstract TopicPath topicPath();

  // Optional parameters.
  /**
   * A supplier for the publisher to be used. If enabled, does not use the publisher cache.
   *
   * The returned type must be convertible to Publisher, but Object is used to
   * prevent adding an api surface dependency on guava when this is not used.
   */
  public abstract @Nullable SerializableSupplier