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 org.apache.beam.runners.dataflow.worker.windmill.Windmill;
  
  /**
   * A composite key used to identify a unit of {@link Work}. If multiple units of {@link Work} have
   * the same workToken AND cacheToken, the {@link Work} is a duplicate. If multiple units of {@link
   * Work} have the same workToken, but different cacheTokens, the {@link Work} is a retry. If
   * multiple units of {@link Work} have the same cacheToken, but different workTokens, the {@link
   * Work} is obsolete.
   */
  @AutoValue
  public abstract class WorkId {
  
    public static Builder builder() {
      return new AutoValue_WorkId.Builder();
    }
  
    public static WorkId of(Windmill.WorkItem workItem) {
      return WorkId.builder()
          .setCacheToken(workItem.getCacheToken())
          .setWorkToken(workItem.getWorkToken())
          .build();
    }
  
    public abstract long cacheToken();
  
    public abstract long workToken();
  
    @AutoValue.Builder
    public abstract static class Builder {
      public abstract Builder setCacheToken(long value);
  
      public abstract Builder setWorkToken(long value);
  
      public abstract WorkId build();
    }
  }
  