hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/SequenceId.java

   1 /**
   2  *
   3  * Licensed to the Apache Software Foundation (ASF) under one
   4  * or more contributor license agreements.  See the NOTICE file
   5  * distributed with this work for additional information
   6  * regarding copyright ownership.  The ASF licenses this file
   7  * to you under the Apache License, Version 2.0 (the
   8  * "License"); you may not use this file except in compliance
   9  * with the License.  You may obtain a copy of the License at
  10  *
  11  *     http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  */
  19
  20 package org.apache.hadoop.hbase.regionserver;
  21
  22 import org.apache.yetus.audience.InterfaceAudience;
  23
  24 /**
  25  * Interface which abstracts implementations on log sequenceId assignment
  26  */
  27 @InterfaceAudience.Private
  28 public interface SequenceId {
  29   /**
  30    * Used to represent when a particular wal key doesn't know/care about the sequence ordering.
  31    */
  32   long NO_SEQUENCE_ID = -1;
  33
  34   default long getSequenceId() {
  35     return NO_SEQUENCE_ID;
  36   }
  37 }