/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.gobblin.source.extractor;

import org.apache.gobblin.annotation.Alpha;


/**
 * {@link Watermark} that is {@link Comparable} and Checkpointable
 */
@Alpha
public interface CheckpointableWatermark extends Watermark, Comparable<CheckpointableWatermark> {

  /**
   *
   * @return the unique id of the source that generated this watermark.
   * Watermarks generated by different sources are not comparable and therefore need to be checkpoint-ed independently
   */
  String getSource();

  /**
   *
   * @return the source-local watermark.
   */
  ComparableWatermark getWatermark();

}