001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.service;
019
020import java.io.Serializable;
021
022import org.apache.hadoop.classification.InterfaceAudience.Public;
023import org.apache.hadoop.classification.InterfaceStability.Evolving;
024
025/**
026 * A serializable lifecycle event: the time a state
027 * transition occurred, and what state was entered.
028 */
029@Public
030@Evolving
031public class LifecycleEvent implements Serializable {
032  
033  private static final long serialVersionUID = 1648576996238247836L;
034
035  /**
036   * Local time in milliseconds when the event occurred
037   */
038  public long time;
039  /**
040   * new state
041   */
042  public Service.STATE state;
043}