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.hbase.regionserver; 019 020import org.apache.yetus.audience.InterfaceAudience; 021 022/** 023 * Interface which abstracts implementations on log sequenceId assignment 024 */ 025@InterfaceAudience.Private 026public interface SequenceId { 027 /** 028 * Used to represent when a particular wal key doesn't know/care about the sequence ordering. 029 */ 030 long NO_SEQUENCE_ID = -1; 031 032 default long getSequenceId() { 033 return NO_SEQUENCE_ID; 034 } 035}