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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.Offset;

/** A representation of progress through a Pub/Sub lite partition. */
@AutoValue
abstract class OffsetByteProgress {
  static OffsetByteProgress of(Offset lastOffset, long batchBytes) {
    return new AutoValue_OffsetByteProgress(lastOffset, batchBytes);
  }
  /** The last offset of the messages received. */
  abstract Offset lastOffset();

  abstract long batchBytes();
}