content: /*
   * 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.beam.runners.dataflow.worker.streaming;
  
  import com.google.auto.value.AutoValue;
  import javax.annotation.Nullable;
  import org.apache.beam.runners.dataflow.worker.WindmillTimeUtils;
  import org.apache.beam.sdk.annotations.Internal;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions;
  import org.joda.time.Instant;
  
  /** Watermarks for stream pipeline processing. */
  @AutoValue
  @Internal
  public abstract class Watermarks {
  
    public static Builder builder() {
      return new AutoValue_Watermarks.Builder();
    }
  
    public abstract Instant inputDataWatermark();
  
    public abstract @Nullable Instant synchronizedProcessingTime();
  
    public abstract @Nullable Instant outputDataWatermark();
  
    @AutoValue.Builder
    public abstract static class Builder {
      private static boolean hasValidOutputDataWatermark(Watermarks watermarks) {
        @Nullable Instant outputDataWatermark = watermarks.outputDataWatermark();
        return outputDataWatermark == null
            || !outputDataWatermark.isAfter(watermarks.inputDataWatermark());
      }
  
      public abstract Builder setInputDataWatermark(Instant value);
  
      public abstract Builder setSynchronizedProcessingTime(@Nullable Instant value);
  
      public abstract Builder setOutputDataWatermark(@Nullable Instant value);
  
      public final Builder setOutputDataWatermark(long outputDataWatermark) {
        return setOutputDataWatermark(
            WindmillTimeUtils.windmillToHarnessWatermark(outputDataWatermark));
      }
  
      abstract Watermarks autoBuild();
  
      public final Watermarks build() {
        Watermarks watermarks = autoBuild();
        Preconditions.checkState(hasValidOutputDataWatermark(watermarks));
        return watermarks;
      }
    }
  }
  