content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.job.meta;
  
  import alluxio.util.CommonUtils;
  
  import java.util.concurrent.atomic.AtomicLong;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * This class generates unique job ids.
   */
  @ThreadSafe
  public final class JobIdGenerator {
    private final AtomicLong mNextJobId;
  
    /**
     * Creates a new instance.
     */
    public JobIdGenerator() {
      // shift by 10,000 to avoid conflicts with worker IDs.
      mNextJobId = new AtomicLong(CommonUtils.getCurrentMs() + 10 * 1000);
    }
  
    /**
     * @return a new job id
     */
    public long getNewJobId() {
      return mNextJobId.getAndIncrement();
    }
  }
  