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Proxima platform's module proxima-direct-io-kafka

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/**
 * Copyright 2017-2021 O2 Czech Republic, a.s.
 *
 * 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 cz.o2.proxima.direct.kafka;

import com.google.common.base.MoreObjects;
import cz.o2.proxima.direct.commitlog.Offset;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;
import lombok.Getter;
import org.apache.kafka.common.TopicPartition;

/** Offset used in bulk consumption. */
class TopicOffset implements Offset {

  private static final long serialVersionUID = 1L;

  private final PartitionWithTopic partition;
  // offset to kafka partition, < 0 means undefined (or default)
  @Getter private final long offset;
  @Getter private final long watermark;

  TopicOffset(PartitionWithTopic partition, long offset, long watermark) {
    this.partition = partition;
    this.offset = offset;
    this.watermark = watermark;
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("partition", partition)
        .add("offset", offset)
        .add("watermark", watermark)
        .toString();
  }

  @Override
  public PartitionWithTopic getPartition() {
    return partition;
  }

  @Override
  public boolean equals(Object obj) {
    if (obj instanceof TopicOffset) {
      TopicOffset other = (TopicOffset) obj;
      return other.partition.equals(partition)
          && other.offset == offset
          && other.watermark == watermark;
    }
    return false;
  }

  @Override
  public int hashCode() {
    return Objects.hash(partition, offset, watermark);
  }

  static List fromMap(Map offsetMap, long watermark) {
    return offsetMap
        .entrySet()
        .stream()
        .map(
            e ->
                new TopicOffset(
                    new PartitionWithTopic(e.getKey().topic(), e.getKey().partition()),
                    e.getValue(),
                    watermark))
        .collect(Collectors.toList());
  }
}