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.client; 019 020import org.apache.yetus.audience.InterfaceAudience; 021 022/** 023 * Specify Isolation levels in Scan operations. 024 * <p> 025 * There are two isolation levels. A READ_COMMITTED isolation level indicates that only data that is 026 * committed be returned in a scan. An isolation level of READ_UNCOMMITTED indicates that a scan 027 * should return data that is being modified by transactions that might not have been committed yet. 028 */ 029@InterfaceAudience.Public 030public enum IsolationLevel { 031 032 READ_COMMITTED, 033 READ_UNCOMMITTED; 034 035 public byte[] toBytes() { 036 return new byte[] { toByte() }; 037 } 038 039 public byte toByte() { 040 return (byte) this.ordinal(); 041 } 042 043 public static IsolationLevel fromBytes(byte[] bytes) { 044 return IsolationLevel.fromByte(bytes[0]); 045 } 046 047 public static IsolationLevel fromByte(byte vbyte) { 048 return IsolationLevel.values()[vbyte]; 049 } 050}