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.master.block.meta;
  
  import alluxio.util.CommonUtils;
  import alluxio.wire.WorkerNetAddress;
  
  import com.google.common.base.Preconditions;
  
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * An object representation of the worker metadata. All fields are final in this object.
   * This class is thread safe so accessing or updating the fields do not require locking.
   */
  @ThreadSafe
  public class StaticWorkerMeta {
    /** Worker's address. */
    final WorkerNetAddress mWorkerAddress;
    /** The id of the worker. */
    final long mId;
    /** Start time of the worker in ms. */
    final long mStartTimeMs;
  
    /**
     * Constructor.
     *
     * @param id the worker ID
     * @param address the worker address
     */
    public StaticWorkerMeta(long id, WorkerNetAddress address) {
      mId = id;
      mWorkerAddress = Preconditions.checkNotNull(address, "address");
      mStartTimeMs = CommonUtils.getCurrentMs();
    }
  }
  