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     */
018    package org.apache.hadoop.service;
019    
020    import java.io.Serializable;
021    
022    import org.apache.hadoop.classification.InterfaceAudience.Public;
023    import 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
031    public 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    }