hadoop AbstractTracking 源码
haddop AbstractTracking 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/AbstractTracking.java
/**
* 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.hadoop.hdfs.server.namenode.startupprogress;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* Abstract base of internal data structures used for tracking progress. For
* primitive long properties, {@link Long#MIN_VALUE} is used as a sentinel value
* to indicate that the property is undefined.
*/
@InterfaceAudience.Private
abstract class AbstractTracking implements Cloneable {
long beginTime = Long.MIN_VALUE;
long endTime = Long.MIN_VALUE;
/**
* Subclass instances may call this method during cloning to copy the values of
* all properties stored in this base class.
*
* @param dest AbstractTracking destination for copying properties
*/
protected void copy(AbstractTracking dest) {
dest.beginTime = beginTime;
dest.endTime = endTime;
}
}
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