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/**
 * 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.common;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.util.SequentialNumber;

/****************************************************************
 * A GenerationStamp is a Hadoop FS primitive, identified by a long.
 ****************************************************************/
@InterfaceAudience.Private
public class GenerationStamp extends SequentialNumber {
  /**
   * The last reserved generation stamp.
   */
  public static final long LAST_RESERVED_STAMP = 1000L;

  /**
   * Generation stamp of blocks that pre-date the introduction
   * of a generation stamp.
   */
  public static final long GRANDFATHER_GENERATION_STAMP = 0;

  /**
   * Create a new instance, initialized to {@link #LAST_RESERVED_STAMP}.
   */
  public GenerationStamp() {
    super(LAST_RESERVED_STAMP);
  }
}